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Insurance - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
Schedule of Other Liabilities [Line Items] |  |  |
Insurance policy coverage, general and automobile liability losses | $ 200,000,000.0 |  |
Insurance policy coverage, property damage | 75,000,000.0 |  |
Decrease in reserves for insurance claims | (36,600,000) |  |
Change in case reserves plus IBNR Claims — prior years | (30,200,000) | $ (3,400,000) | $ 10,200,000
Minimum |  |  |
Schedule of Other Liabilities [Line Items] |  |  |
Self insurance retention amount per-claim | 1,000,000.0 |  |
Primary policy limit | 1,000,000.0 |  |
Maximum |  |  |
Schedule of Other Liabilities [Line Items] |  |  |
Self insurance retention amount per-claim | 1,500,000 |  |
Primary policy limit | 5,000,000.0 |  |
Self insurance retention amount per participant per year | $ 500,000 |  |

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- Definition Decrease In Total Reserve Claims + References No definition available. + Details
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Balance Type: | debit
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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
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the policy limit provided by the insurance program for property damage risks. + References No definition available. + Details
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- Definition Schedule of Other Liabilities [Line Items] + References No definition available. + Details
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- Definition Self Insured Retention Amount Per Occurrence + References No definition available. + Details
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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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
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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Balance Type: | debit
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- Details
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- Details
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