3.8.0.1 html 178 278 1 true 62 0 false 8 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.abm.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - Consolidated Balance Sheets (Unaudited) Sheet http://www.abm.com/role/ConsolidatedBalanceSheetsUnaudited Consolidated Balance Sheets (Unaudited) Statements 2 false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical) Sheet http://www.abm.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical Consolidated Balance Sheets (Unaudited) (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Unaudited) Sheet http://www.abm.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossUnaudited Consolidated Statements of Comprehensive Income (Loss) (Unaudited) Statements 4 false false R5.htm 1005000 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://www.abm.com/role/ConsolidatedStatementsOfCashFlowsUnaudited Consolidated Statements of Cash Flows (Unaudited) Statements 5 false false R6.htm 2101100 - Disclosure - The Company and Nature of Operations Sheet http://www.abm.com/role/CompanyAndNatureOfOperations The Company and Nature of Operations Notes 6 false false R7.htm 2102100 - Disclosure - Basis of Presentation and Significant Accounting Policies Sheet http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPolicies Basis of Presentation and Significant Accounting Policies Notes 7 false false R8.htm 2103100 - Disclosure - Acquisitions Sheet http://www.abm.com/role/Acquisitions Acquisitions Notes 8 false false R9.htm 2104100 - Disclosure - Restructuring and Related Costs Sheet http://www.abm.com/role/RestructuringAndRelatedCosts Restructuring and Related Costs Notes 9 false false R10.htm 2105100 - Disclosure - Net Income Per Common Share Sheet http://www.abm.com/role/NetIncomePerCommonShare Net Income Per Common Share Notes 10 false false R11.htm 2106100 - Disclosure - Fair Value of Financial Instruments Sheet http://www.abm.com/role/FairValueOfFinancialInstruments Fair Value of Financial Instruments Notes 11 false false R12.htm 2107100 - Disclosure - Auction Rate Securities Sheet http://www.abm.com/role/AuctionRateSecurities Auction Rate Securities Notes 12 false false R13.htm 2108100 - Disclosure - Insurance Sheet http://www.abm.com/role/Insurance Insurance Notes 13 false false R14.htm 2109100 - Disclosure - Credit Facility Sheet http://www.abm.com/role/CreditFacility Credit Facility Notes 14 false false R15.htm 2110100 - Disclosure - Commitments and Contingencies Sheet http://www.abm.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 15 false false R16.htm 2111100 - Disclosure - Income Taxes Sheet http://www.abm.com/role/IncomeTaxes Income Taxes Notes 16 false false R17.htm 2112100 - Disclosure - Segment Information Sheet http://www.abm.com/role/SegmentInformation Segment Information Notes 17 false false R18.htm 2202201 - Disclosure - Basis of Presentation and Significant Accounting Policies (Policies) Sheet http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPolicies Basis of Presentation and Significant Accounting Policies (Policies) Policies http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPolicies 18 false false R19.htm 2302302 - Disclosure - Basis of Presentation and Significant Accounting Policies (Tables) Sheet http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesTables Basis of Presentation and Significant Accounting Policies (Tables) Tables http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPolicies 19 false false R20.htm 2303301 - Disclosure - Acquisitions (Tables) Sheet http://www.abm.com/role/AcquisitionsTables Acquisitions (Tables) Tables http://www.abm.com/role/Acquisitions 20 false false R21.htm 2304301 - Disclosure - Restructuring and Related Costs (Tables) Sheet http://www.abm.com/role/RestructuringAndRelatedCostsTables Restructuring and Related Costs (Tables) Tables http://www.abm.com/role/RestructuringAndRelatedCosts 21 false false R22.htm 2305301 - Disclosure - Net Income Per Common Share (Tables) Sheet http://www.abm.com/role/NetIncomePerCommonShareTables Net Income Per Common Share (Tables) Tables http://www.abm.com/role/NetIncomePerCommonShare 22 false false R23.htm 2306301 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.abm.com/role/FairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://www.abm.com/role/FairValueOfFinancialInstruments 23 false false R24.htm 2307301 - Disclosure - Auction Rate Securities (Tables) Sheet http://www.abm.com/role/AuctionRateSecuritiesTables Auction Rate Securities (Tables) Tables http://www.abm.com/role/AuctionRateSecurities 24 false false R25.htm 2308301 - Disclosure - Insurance (Tables) Sheet http://www.abm.com/role/InsuranceTables Insurance (Tables) Tables http://www.abm.com/role/Insurance 25 false false R26.htm 2309301 - Disclosure - Credit Facility (Tables) Sheet http://www.abm.com/role/CreditFacilityTables Credit Facility (Tables) Tables http://www.abm.com/role/CreditFacility 26 false false R27.htm 2312301 - Disclosure - Segment Information (Tables) Sheet http://www.abm.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.abm.com/role/SegmentInformation 27 false false R28.htm 2401401 - Disclosure - The Company and Nature of Operations - Narrative (Details) Sheet http://www.abm.com/role/CompanyAndNatureOfOperationsNarrativeDetails The Company and Nature of Operations - Narrative (Details) Details 28 false false R29.htm 2402403 - Disclosure - Basis of Presentation and Significant Accounting Policies - Government Services (Details) Sheet http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesGovernmentServicesDetails Basis of Presentation and Significant Accounting Policies - Government Services (Details) Details 29 false false R30.htm 2402404 - Disclosure - Basis of Presentation and Significant Accounting Policies - Management Reimbursement Revenue (Details) Sheet http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesManagementReimbursementRevenueDetails Basis of Presentation and Significant Accounting Policies - Management Reimbursement Revenue (Details) Details 30 false false R31.htm 2403402 - Disclosure - Acquisitions - GCA Consideration Transferred (Details) Sheet http://www.abm.com/role/AcquisitionsGcaConsiderationTransferredDetails Acquisitions - GCA Consideration Transferred (Details) Details 31 false false R32.htm 2403403 - Disclosure - Acquisitions - GCA Preliminary Purchase Price Allocation (Details) Sheet http://www.abm.com/role/AcquisitionsGcaPreliminaryPurchasePriceAllocationDetails Acquisitions - GCA Preliminary Purchase Price Allocation (Details) Details 32 false false R33.htm 2403404 - Disclosure - Acquisitions - GCA Pro Forma Financial Information (Details) Sheet http://www.abm.com/role/AcquisitionsGcaProFormaFinancialInformationDetails Acquisitions - GCA Pro Forma Financial Information (Details) Details 33 false false R34.htm 2403405 - Disclosure - Acquisitions - Other 2017 Acquisitions (Details) Sheet http://www.abm.com/role/AcquisitionsOther2017AcquisitionsDetails Acquisitions - Other 2017 Acquisitions (Details) Details 34 false false R35.htm 2404402 - Disclosure - Restructuring and Related Costs - Restructuring and Related Liabilities (Details) Sheet http://www.abm.com/role/RestructuringAndRelatedCostsRestructuringAndRelatedLiabilitiesDetails Restructuring and Related Costs - Restructuring and Related Liabilities (Details) Details 35 false false R36.htm 2404403 - Disclosure - Restructuring and Related Costs - Cumulative Restructuring and Related Charges (Details) Sheet http://www.abm.com/role/RestructuringAndRelatedCostsCumulativeRestructuringAndRelatedChargesDetails Restructuring and Related Costs - Cumulative Restructuring and Related Charges (Details) Details 36 false false R37.htm 2405402 - Disclosure - Net Income Per Common Share - Calculations of Basic and Diluted Net Income Per Common Share (Details) Sheet http://www.abm.com/role/NetIncomePerCommonShareCalculationsOfBasicAndDilutedNetIncomePerCommonShareDetails Net Income Per Common Share - Calculations of Basic and Diluted Net Income Per Common Share (Details) Details 37 false false R38.htm 2405403 - Disclosure - Net Income Per Common Share - Anti-Dilutive Outstanding Stock Awards Issued Under Share-Based Compensation Plans (Details) Sheet http://www.abm.com/role/NetIncomePerCommonShareAntiDilutiveOutstandingStockAwardsIssuedUnderShareBasedCompensationPlansDetails Net Income Per Common Share - Anti-Dilutive Outstanding Stock Awards Issued Under Share-Based Compensation Plans (Details) Details 38 false false R39.htm 2406402 - Disclosure - Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Sheet http://www.abm.com/role/FairValueOfFinancialInstrumentsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Details 39 false false R40.htm 2407402 - Disclosure - Auction Rate Securities - Narrative (Details) Sheet http://www.abm.com/role/AuctionRateSecuritiesNarrativeDetails Auction Rate Securities - Narrative (Details) Details 40 false false R41.htm 2407403 - Disclosure - Auction Rate Securities - Significant Assumptions Used to Determine Fair Value of Auction Rate Securities (Details) Sheet http://www.abm.com/role/AuctionRateSecuritiesSignificantAssumptionsUsedToDetermineFairValueOfAuctionRateSecuritiesDetails Auction Rate Securities - Significant Assumptions Used to Determine Fair Value of Auction Rate Securities (Details) Details 41 false false R42.htm 2408402 - Disclosure - Insurance - Narrative (Details) Sheet http://www.abm.com/role/InsuranceNarrativeDetails Insurance - Narrative (Details) Details 42 false false R43.htm 2408403 - Disclosure - Insurance - Insurance Related Balances and Activity (Details) Sheet http://www.abm.com/role/InsuranceInsuranceRelatedBalancesAndActivityDetails Insurance - Insurance Related Balances and Activity (Details) Details 43 false false R44.htm 2408404 - Disclosure - Insurance - Instruments Used to Collateralize Insurance Obligations (Details) Sheet http://www.abm.com/role/InsuranceInstrumentsUsedToCollateralizeInsuranceObligationsDetails Insurance - Instruments Used to Collateralize Insurance Obligations (Details) Details 44 false false R45.htm 2409402 - Disclosure - Credit Facility - Narrative (Details) Sheet http://www.abm.com/role/CreditFacilityNarrativeDetails Credit Facility - Narrative (Details) Details 45 false false R46.htm 2409403 - Disclosure - Credit Facility - Credit Facility Information (Details) Sheet http://www.abm.com/role/CreditFacilityCreditFacilityInformationDetails Credit Facility - Credit Facility Information (Details) Details 46 false false R47.htm 2409404 - Disclosure - Credit Facility - Term Loan Maturities (Details) Sheet http://www.abm.com/role/CreditFacilityTermLoanMaturitiesDetails Credit Facility - Term Loan Maturities (Details) Details 47 false false R48.htm 2409405 - Disclosure - Credit Facility - Interest Rate Swaps (Details) Sheet http://www.abm.com/role/CreditFacilityInterestRateSwapsDetails Credit Facility - Interest Rate Swaps (Details) Details 48 false false R49.htm 2410401 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://www.abm.com/role/CommitmentsAndContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) Details 49 false false R50.htm 2411401 - Disclosure - Income Taxes - Narrative (Details) Sheet http://www.abm.com/role/IncomeTaxesNarrativeDetails Income Taxes - Narrative (Details) Details 50 false false R51.htm 2412402 - Disclosure - Segment Information - Financial Information by Reportable Segment (Details) Sheet http://www.abm.com/role/SegmentInformationFinancialInformationByReportableSegmentDetails Segment Information - Financial Information by Reportable Segment (Details) Details 51 false false All Reports Book All Reports abm-20180430.xml abm-20180430.xsd abm-20180430_cal.xml abm-20180430_def.xml abm-20180430_lab.xml abm-20180430_pre.xml http://fasb.org/us-gaap/2017-01-31 http://xbrl.sec.gov/dei/2014-01-31 http://xbrl.sec.gov/invest/2013-01-31 true true