Supplemental Consolidating Information - Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Nov. 20, 2014
Nov. 19, 2014
Current Assets          
Cash and cash equivalents $ 27.5 $ 33.0 $ 88.3 $ 0.0  
Accounts receivable, net 576.3 503.0      
Unbilled accounts receivable, net 159.8 135.7      
Financing receivables, current portion 84.2 83.1      
Inventory 27.7 48.3      
Prepaid expenses and other current assets 63.4 68.2      
Total current assets 938.9 871.3      
Property and equipment, net 32.1 32.9      
Deferred tax asset 0.0 0.0      
Financing receivables, less current portion 113.6 102.0      
Goodwill 781.5 781.5 662.5   $ 0.0
Identifiable intangible assets, net 751.9 825.5      
Other assets 32.7 9.9      
Total assets 2,650.7 2,623.1      
Current Liabilities          
Current maturities of long-term debt 0.0 7.4      
Accounts payable – trade 350.5 382.3      
Accounts payable – floor plan 264.9 223.3      
Accrued expenses and other current liabilities 216.3 167.1      
Discounted financing receivables, current portion 79.9 75.3      
Total current liabilities 911.6 855.4      
Long-term debt, net of debt issuance costs and current maturities 730.7 1,030.6      
Discounted financing receivables, less current portion 104.7 87.1      
Deferred income tax liabilities 270.4 288.0      
Other liabilities 30.4 15.1      
Total liabilities 2,047.8 2,276.2      
Total stockholders’ equity 602.9 346.9 335.8   $ 0.0
Total liabilities and stockholders’ equity 2,650.7 2,623.1      
Intercompany Eliminations [Member]          
Current Assets          
Cash and cash equivalents 0.0 0.0 0.0    
Accounts receivable, net 0.0 0.0      
Unbilled accounts receivable, net 0.0 0.0      
Financing receivables, current portion 0.0 0.0      
Inventory 0.0 0.0      
Prepaid expenses and other current assets (7.0) (0.4)      
Total current assets (7.0) (0.4)      
Property and equipment, net 0.0 0.0      
Deferred tax asset (2.7) (3.0)      
Financing receivables, less current portion 0.0 0.0      
Goodwill 0.0 0.0      
Identifiable intangible assets, net 0.0 0.0      
Other assets (605.2) (317.1)      
Total assets (614.9) (320.5)      
Current Liabilities          
Current maturities of long-term debt   0.0      
Accounts payable – trade 0.0 0.0      
Accounts payable – floor plan 0.0 0.0      
Accrued expenses and other current liabilities (7.0) (0.4)      
Discounted financing receivables, current portion 0.0 0.0      
Total current liabilities (7.0) (0.4)      
Long-term debt, net of debt issuance costs and current maturities 0.0 0.0      
Discounted financing receivables, less current portion 0.0 0.0      
Deferred income tax liabilities (2.7) (3.0)      
Other liabilities 0.0 0.0      
Total liabilities (9.7) (3.4)      
Total stockholders’ equity (605.2) (317.1)      
Total liabilities and stockholders’ equity (614.9) (320.5)      
Presidio, Inc. [Member]          
Current Assets          
Cash and cash equivalents 0.7 26.1 26.0 $ 0.0  
Prepaid expenses and other current assets 1.3 0.9      
Total current assets 2.0 27.0      
Total assets 609.9 347.1      
Current Liabilities          
Accrued expenses and other current liabilities 7.0 0.2      
Total current liabilities 7.0 0.2      
Total liabilities 7.0 0.2      
Total stockholders’ equity 602.9 346.9      
Total liabilities and stockholders’ equity 609.9 347.1      
Presidio, Inc. [Member] | Reportable Legal Entities [Member]          
Current Assets          
Cash and cash equivalents 0.7 26.1 26.0    
Accounts receivable, net 0.0 0.0      
Unbilled accounts receivable, net 0.0 0.0      
Financing receivables, current portion 0.0 0.0      
Inventory 0.0 0.0      
Prepaid expenses and other current assets 1.3 0.9      
Total current assets 2.0 27.0      
Property and equipment, net 0.0 0.0      
Deferred tax asset 2.7 3.0      
Financing receivables, less current portion 0.0 0.0      
Goodwill 0.0 0.0      
Identifiable intangible assets, net 0.0 0.0      
Other assets 605.2 317.1      
Total assets 609.9 347.1      
Current Liabilities          
Current maturities of long-term debt   0.0      
Accounts payable – trade 0.0 0.0      
Accounts payable – floor plan 0.0 0.0      
Accrued expenses and other current liabilities 7.0 0.2      
Discounted financing receivables, current portion 0.0 0.0      
Total current liabilities 7.0 0.2      
Long-term debt, net of debt issuance costs and current maturities 0.0 0.0      
Discounted financing receivables, less current portion 0.0 0.0      
Deferred income tax liabilities 0.0 0.0      
Other liabilities 0.0 0.0      
Total liabilities 7.0 0.2      
Total stockholders’ equity 602.9 346.9      
Total liabilities and stockholders’ equity 609.9 347.1      
Presidio Holdings Inc. & Subsidiaries [Member] | Reportable Legal Entities [Member]          
Current Assets          
Cash and cash equivalents 26.8 6.9 $ 62.3    
Accounts receivable, net 576.3 503.0      
Unbilled accounts receivable, net 159.8 135.7      
Financing receivables, current portion 84.2 83.1      
Inventory 27.7 48.3      
Prepaid expenses and other current assets 69.1 67.7      
Total current assets 943.9 844.7      
Property and equipment, net 32.1 32.9      
Deferred tax asset 0.0 0.0      
Financing receivables, less current portion 113.6 102.0      
Goodwill 781.5 781.5      
Identifiable intangible assets, net 751.9 825.5      
Other assets 32.7 9.9      
Total assets 2,655.7 2,596.5      
Current Liabilities          
Current maturities of long-term debt   7.4      
Accounts payable – trade 350.5 382.3      
Accounts payable – floor plan 264.9 223.3      
Accrued expenses and other current liabilities 216.3 167.3      
Discounted financing receivables, current portion 79.9 75.3      
Total current liabilities 911.6 855.6      
Long-term debt, net of debt issuance costs and current maturities 730.7 1,030.6      
Discounted financing receivables, less current portion 104.7 87.1      
Deferred income tax liabilities 273.1 291.0      
Other liabilities 30.4 15.1      
Total liabilities 2,050.5 2,279.4      
Total stockholders’ equity 605.2 317.1      
Total liabilities and stockholders’ equity $ 2,655.7 $ 2,596.5