Goodwill and Intangible Assets Disclosure [Abstract] Changes in carrying amounts of goodwill by reportable segments Schedule of Goodwill [Table Text Block] Components of intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Segment Reporting [Abstract] Schedule of financial information by segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Shareholder Litigation in Relation to Acquisition [Member] Shareholder Litigation in Relation to Acquisition [Member] Shareholder Litigation in Relation to Acquisition [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of plaintiffs Loss Contingency, Number of Plaintiffs Number of class action complaints Loss Contingency, New Claims Filed, Number Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Derivative [Line Items] Derivative [Line Items] Length of interest rate swap Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge Notional amount of interest rate cash flow hedge derivatives Derivative Asset, Notional Amount Libor rate Debt Instrument, Interest Rate, Stated Percentage Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Fair value of interest rate swap Derivative Liability Cash flow hedge loss reclassified to interest expense Interest Expense Deferred expenses related to derivative instruments Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Income Tax Disclosure [Abstract] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Legal Entities [Member] Reportable Legal Entities [Member] Consolidations [Member] Consolidation, Eliminations [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Catamaran Corporation [Member] Parent Company [Member] Guarantors [Member] Guarantor Subsidiaries [Member] Non-Guarantors [Member] Non-Guarantor Subsidiaries [Member] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] ASSETS Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, Net, Current Rebates receivable Rebates Receivable Current Rebates receivable relate to billed and unbilled pharmacy benefits management receivables from pharmaceutical manufacturers and third party administrators in connection with the administration of the rebate program where the Company is the principal contracting party and are due within one year. Other current assets Prepaid Expense and Other Assets, Current Intercompany receivable Intercompany Receivable Intercompany Receivable Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Intercompany loans receivable Intercompany Loans Receivable Intercompany Loans Receivable Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other long-term assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses and other current liabilities Accrued Liabilities and Other Current Liabilities Accrued Liabilities and Other Current Liabilities Rebates payable Pharmacy Benefit Management Rebates Payable Pharmacy benefit management rebates payable represents amounts owed to customers for rebates from pharmaceutical manufacturers and third party administrators where the Company administers the rebate program on the customer’s behalf, and the Company is the principal contracting party and are due within one year. Current portion - long-term debt Long-term Debt, Current Maturities Intercompany payable Intercompany Payable Intercompany Payable Total current liabilities Liabilities, Current Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Long-term debt Long-term Debt, Excluding Current Maturities Intercompany loans payable Intercompany Loans Payable Intercompany Loans Payable Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 10) Commitments and Contingencies Shareholders’ equity Equity [Abstract] Total shareholders' equity Stockholders' Equity Attributable to Parent Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Items not involving cash: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation Share-based Compensation Depreciation of property and equipment Depreciation Amortization of intangible assets Amortization of Intangible Assets Deferred lease inducements and rent Increase (Decrease) in Deferred Leasing Fees Deferred income taxes Deferred Income Tax Expense (Benefit) Tax benefit on option exercises Excess Tax Benefit from Share-based Compensation, Operating Activities Deferred financing cost amortization Amortization of Financing Costs Changes in operating assets and liabilities, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Rebates receivable Increase (Decrease) in Rebates receivable Net change during the reporting period related to billed and unbilled pharmacy benefit management receivables from pharmaceutical manufacturers and third party administrators in connection with the administration of the rebate program where the Company is the principal contracting party. Other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities Rebates payable Increase (Decrease) in Pharmacy Benefit Management Rebates Payable Net change during the reporting period in pharmacy benefit management rebates payable related to amounts owed to customers for rebates from pharmaceutical manufacturers and third party administrators where the Company administers the rebate program on the customer’s behalf, and the Company is the principal contracting party. Other long-term assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of debt Proceeds from Issuance of Debt Repayment of long-term debt Repayments of Long-term Debt Payment of financing costs Payments of Financing Costs Proceeds from exercise of options Proceeds from Stock Options Exercised Tax benefit on option exercises Excess Tax Benefit from Share-based Compensation, Financing Activities Distributions to non-controlling interest Payments of Distributions to Affiliates Other Proceeds from (Payments for) Other Financing Activities Net cash (used) provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign exchange on cash balances Effect of Exchange Rate on Cash and Cash Equivalents Change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Restat [Member] Restat [Member] Restat [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Debt amount Proceeds from Lines of Credit Term of long-term debt Debt Instrument, Term Goodwill expected to be tax deductible Business Acquisition, Goodwill, Expected Tax Deductible Amount Future amortization expense, remainder of 2015 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Fair Value Disclosures [Abstract] Schedule of fair value measurements Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Income Statement [Abstract] Revenue Revenue, Net Cost of revenue Cost of Goods and Services Sold Gross profit Gross Profit Expenses: Operating Expenses [Abstract] Selling, general and administrative Selling, General and Administrative Expense Depreciation of property and equipment Depreciation, Nonproduction Total operating expenses Operating Expenses Operating income Operating Income (Loss) Interest and other expense, net Interest and Other Nonoperating Income (Expense) Interest and Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Less: Net income attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to the Company Net Income (Loss) Attributable to Parent Earnings per share attributable to the Company: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted average number of shares used in computing earnings per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Condensed Consolidating Financial Information Condensed Financial Statements [Text Block] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Net cash provided (used) by operating activities Acquisitions, net of cash acquired Purchases of property and equipment Payment of financing costs Net transactions with parent and affiliates Net Transactions with Parent and Affiliates Net Transactions with Parent and Affiliates Distributions to non-controlling interest Proceeds from restricted stock Proceeds From the Issuance of Restricted Stock Proceeds From the Issuance of Restricted Stock Healthcare Solutions Inc. [Member] Healthcare Solutions Inc. [Member] Healthcare Solutions Inc. [Member] Purchase price Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Anti-dilutive Stock Options and RSU [Member] Anti-dilutive Stock Options and RSUs [Member] Anti-dilutive Stock Options and RSUs [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Weighted average number of shares used in computing basic EPS Add dilutive common stock equivalents: Outstanding stock options and restricted stock units Number Of Stock Options and Restricted Units, Outstanding Number Of Stock Options and Restricted Units, Outstanding Weighted average number of shares used in computing diluted EPS Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Goodwill [Table] Schedule of Goodwill [Table] Segment Reporting Information, by Segment [Axis] Segments [Axis] Reporting Segment [Domain] Segments [Domain] P B M [Member] P B M [Member] P B M [Member] H C I T [Member] H C I T [Member] H C I T [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, Beginning Balance Goodwill, Acquisition Goodwill, Acquired During Period Goodwill, Ending Balance Earnings Per Share Earnings Per Share [Text Block] Statement of Financial Position [Abstract] Accounts receivable, net of allowance for doubtful accounts of $5,571 (2014 — $4,867) Property and equipment, net of accumulated depreciation of $161,038 (2014 — $144,220) Other intangible assets, net of accumulated amortization of $611,562 (2014 — $574,503) Total assets Accrued expenses and other current liabilities Accrued Liabilities, Current Shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Common shares: no par value, unlimited shares authorized; 208,012,259 shares issued and outstanding at March 31, 2015 (December 31, 2014 — 207,493,541 shares) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Total liabilities and equity Summary of condensed balance sheets Condensed Balance Sheet [Table Text Block] Summary of condensed income statements Condensed Income Statement [Table Text Block] Summary of condensed cash flow statements Condensed Cash Flow Statement [Table Text Block] Salveo Specialty Pharmacy, Inc [Member] Salveo Specialty Pharmacy, Inc [Member] Salveo Specialty Pharmacy, Inc [Member] Stated purchase price Business Combination, Stated Purchase Price Business Combination, Stated Purchase Price Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Term Loan Facility [Member] Term Loan Facility [Member] Term Loan Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt, Fiscal Year Maturity [Abstract] Long-term Debt, Fiscal Year Maturity [Abstract] 2015 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2016 Long-term Debt, Maturities, Repayments of Principal in Year Two 2017 Long-term Debt, Maturities, Repayments of Principal in Year Three 2018 Long-term Debt, Maturities, Repayments of Principal in Year Four Long-term debt Long-term Debt, Gross Statement of Comprehensive Income [Abstract] Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized income (loss) on cash flow hedge Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to the Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Units Time Based [Member] Restricted Stock Units Time Based [Member] Restricted Stock Units Time Based [Member] Restricted Stock Units Performance Based [Member] Restricted Stock Units Performance Based [Member] Restricted Stock Units Performance Based [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Vesting [Axis] Vesting [Axis] Award Vesting Types [Domain] Vesting [Domain] Straight Line Vesting Basis [Member] Straight Line Vesting Basis [Member] Straight Line Vesting Basis [Member] Cliff Vesting [Member] Cliff Vesting [Member] Cliff Vesting [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] LTIP Plan [Member] Catamaran Corporation Long-Term Incentive Plan [Member] Catamaran Corporation Long-Term Incentive Plan [Member] Assumed Plans [Member] Assumed Plans [Member] Assumed Plans [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Number of restricted units granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Weighted average grant date value of restricted units granted (in dollars per unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Number of restricted units outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Weighted average grant date fair value of restricted units outstanding (in dollars per unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Stockholders' Equity [Table] Stockholders' Equity [Table] Stockholders' Equity [Table] LTIP [Member] LTIP [Member] Long Term Incentive Plan March 2011 [Member] Stockholders' Equity [Line Items] Stockholders' Equity [Line Items] Stockholders' Equity [Line Items] Number of stock-based awards available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Debt Debt Disclosure [Text Block] Fair Value Fair Value Disclosures [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interest Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Activities during the period (unaudited) [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance, shares Common Stock, Shares, Outstanding Beginning balance, amount Exercise of stock options, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options, amount Stock Issued During Period, Value, Stock Options Exercised Vesting of restricted stock units, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock units, amount Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Tax benefit on options exercised Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Distributions to non-controlling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax Other Adjustments to Additional Paid in Capital, Other Ending balance, shares (unaudited) Ending balance, amount (unaudited) Basis of presentation Consolidation, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Other intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Common stock issued (in shares) Common Stock, Shares, Issued Common stock outstanding (in shares) Components of long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of maturities of principal amounts outstanding under Revolving Facility Schedule of Maturities of Long-term Debt [Table Text Block] Cash payment to shareholders of common stock at acquisition Acquisition Agreement, Share Price To Be Received By Reporting Entity Shareholders, Excluding Perfected Dissenter Rights Shareholders Acquisition Agreement, Share Price To Be Received By Reporting Entity Shareholders, Excluding Perfected Dissenter Rights Shareholders Schedule of Business Acquisitions, by Acquisition Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of fair values assigned to assets acquired and liabilities assumed at the acquisition date Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of estimated fair values and useful lives of intangible assets acquired Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Unaudited pro forma results of operations Business Acquisition, Pro Forma Information [Table Text Block] Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk by Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Concentration Risk by Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales [Member] Sales [Member] Accounts Receivable [Member] Accounts Receivable [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk, number of customers Concentration Risk, Number Of Customers Concentration Risk, Number Of Customers Concentration risk, percentage, period Concentration Risk, Percentage, Period Concentration Risk, Percentage, Period Concentration risk, percentage Concentration Risk, Percentage Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships [Member] Customer Relationships [Member] Non-compete agreements [Member] Noncompete Agreements [Member] Other intangible assets [Member] Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Net Finite-Lived Intangible Assets, Net Trademarks and Trade Names [Member] Trademarks and Trade Names [Member] License [Member] Licensing Agreements [Member] Preliminary post-closing adjustments Business Combination, Consideration Transferred, Liabilities Incurred Purchase price Business Combination, Consideration Transferred Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Total current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Other long term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities Total current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Deferred income taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Acquired intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Equity (income) in subsidiaries Equity In (Income) in Subsidiaries Equity In (Income) in Subsidiaries Schedule of weighted average number of shares Schedule of Weighted Average Number of Shares [Table Text Block] Unrecognized compensation costs on nonvested awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Unrecognized compensation costs on nonvested awards, weighted average period of recognition (in years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Stock Options [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Total stock options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted-average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Secured Debt [Member] Secured Debt [Member] 4.75% Senior Notes [Member] Senior Notes, 4 Point 75 Percent Due 2021 [Member] Senior Notes, 4 Point 75 Percent Due 2021 [Member] Long-term Debt Long-term Debt Less current maturities Long-term debt, less current maturities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Derivative Segment Information Segment Reporting Disclosure [Text Block] Business Combinations Business Combination Disclosure [Text Block] Recent Accounting Pronouncements [Abstract] Recent Accounting Pronouncements [Abstract] Recent Accounting Pronouncements Recent Accounting Pronouncements [Text Block] Recent Accounting Pronouncements Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Description of Business Nature of Operations [Text Block] Schedule of fair value assumptions Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Schedule of stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of restricted stock units activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of unrecognized compensation expenses Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Line of Credit Facility [Table] Line of Credit Facility [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Financial guarantee [Member] Financial Guarantee [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period One [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Amended Credit Agreement [Member] Amended Credit Agreement [Member] Amended Credit Agreement [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Federal Funds Rate [Member] Federal Funds Rate [Member] Federal Funds Rate [Member] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Base Rate [Member] Base Rate [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt amount Debt Instrument, Face Amount Stated interest rate Interest Expense, Debt Debt Instrument, Periodic Payment, Interest Proceeds from issuance of debt Proceeds from Issuance of Long-term Debt Debt discount Debt Instrument, Unamortized Discount Debt issuance cost paid Debt Issuance Cost Repayments of Long-term Lines of Credit Repayments of Long-term Lines of Credit Long-term Debt Amortization of financing costs and debt discounts Amortization of Financing Costs and Discounts Trigger amount for redemption of debt Guarantor Obligations, Triggering 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Interest Rate During Period Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Initial Amounts Recognized at Acquisition Date [Member] Scenario, Previously Reported [Member] Measurement Period Adjustments [Member] Scenario, Adjustment [Member] Current Amounts Recognized at Acquisition Date [Member] Scenario, Actual [Member] Customer Relationship - PBM [Member] Customer Relationship - PBM [Member] Customer Relationship - PBM [Member] Customer Relationship, Cash Cards [Member] Customer Relationship, Cash Cards [Member] Customer Relationship, Cash Cards [Member] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Accounts receivable Rebates receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Rebates Receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Rebates Receivable Other current assets Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangible assets Accounts payable Rebates payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Rebates Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Rebates Payable Accrued liabilities Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Measurement period adjustment paid to former Restat owners Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options outstanding, weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Concentration Risk Concentration Risk Disclosure [Text Block] Business Acquisition, Pro Forma Information [Abstract] Business Acquisition, Pro Forma Information [Abstract] Revenue Business Acquisition, Pro Forma Revenue Gross profit Business Acquisitions Pro Forma Gross Profit The pro forma gross profit for a period as if the business combination or combinations had been completed at the beginning of the period. Net income attributable to the Company Business Acquisition, Pro Forma Net Income (Loss) Basic (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Basic (in shares) Weighted Average Basic Shares Outstanding, Pro Forma Diluted (in shares) Pro Forma Weighted Average Shares Outstanding, Diluted Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Future amortization expense, 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two Future amortization expense, 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three Future amortization expense, 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four Future amortization expense, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Future amortization expense, 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Six Finite-Lived Intangible Assets, Amortization Expense, Year Six Future amortization expense after 2020 Finite-lived Intangible Assets, Amortization Expense, After Year Six Finite-lived Intangible Assets, Amortization Expense, After Year Six Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of operating segments Number of Operating Segments Revenue Gross profit Total assets at March 31