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Insurance - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Apr. 30, 2018 | Jul. 31, 2018 | Jul. 31, 2017
Schedule of Other Liabilities [Line Items] |  |  |  |
Self insurance retention amount per-claim | $ 1,000,000 |  | $ 1,000,000 |
Insurance policy coverage, general and automobile liability losses | 200,000,000 |  | 200,000,000 |
Insurance policy coverage, property damage | 75,000,000 |  | 75,000,000 |
Change in reserves for insurance claims | 6,000,000 | $ 4,000,000 | 10,000,000 | $ 22,300,000
Insurance reserve adjustment, amount less than prior year adjustment |  |  | (12,300,000) |
Minimum |  |  |  |
Schedule of Other Liabilities [Line Items] |  |  |  |
Primary policy limit | 1,000,000 |  | 1,000,000 |
Maximum |  |  |  |
Schedule of Other Liabilities [Line Items] |  |  |  |
Primary policy limit | 5,000,000 |  | 5,000,000 |
Self insurance retention amount per-claim, medical plan | $ 400,000.0 |  | $ 400,000.0 |

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- Definition Increase in Total Reserve Claims + References No definition available. + Details
Name: | abm_IncreaseinTotalReserveClaims
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents commercial insurance umbrella policies that cover general liability and automobile liability losses above primary limits. + References No definition available. + Details
Name: | abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurance Reserve, Adjustment Less Than Or (Greater Than) Prior Year Adjustment, Amount + References No definition available. + Details
Name: | abm_InsuranceReserveAdjustmentLessThanOrGreaterThanPriorYearAdjustmentAmount
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the policy limit provided by the insurance program for property damage risks. + References No definition available. + Details
Name: | abm_PropertyDamagePolicyLimit
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Schedule of Other Liabilities [Line Items] + References No definition available. + Details
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Namespace Prefix: | abm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Self Insured Retention Amount Per Occurrence + References No definition available. + Details
Name: | abm_SelfInsuredRetentionAmountPerOccurrence
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Self Insured Retention Amount Per Participant Per Year For Certain Employee Medical And Dental Programs + References No definition available. + Details
Name: | abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the policy limit provided by the insurance program for workers' compensation, general liability, and other insurable risks. + References No definition available. + Details
Name: | abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |