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Revenues - Contract with Customer, Asset and Liability (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Billed trade receivables | $ 835,800,000 | $ 978,700,000
Unbilled trade receivables | 53,900,000 | 56,900,000
Costs incurred in excess of amounts billed | 52,200,000 | 72,600,000
Capitalized commissions | 25,200,000 | $ 21,800,000
Capitalized contract price | 16,400,000 |
Capitalized contract cost, amortization | 13,000,000.0 |
Capitalized Contract Cost, Impairment Loss | 0 |
Contract with Customer, Liabilities [Roll Forward] |  |
Contract liabilities, balance at beginning of period | 38,000,000.0 |
Additional contract liabilities | 315,500,000 |
Recognition of deferred revenue | (317,100,000) |
Contract liabilities, balance at end of period | $ 36,400,000 |

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- Definition Contract with Customer, Liability, Revenue Recognized, During The Period + References No definition available. + Details
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Asset, Billed Trade Receivable, Net, Current + 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 Contract with Customer, Asset, Capitalized Commissions + References No definition available. + Details
Name: | abm_ContractwithCustomerAssetCapitalizedCommissions
Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with Customer, Asset, Costs Incurred in Excess of Amounts Billed, Current + References No definition available. + Details
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
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- Definition Contract with Customer, Asset, Increase (Decrease) for New Capitalized Costs + References No definition available. + Details
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Contract with Customer, Asset, Unbilled Trade Receivables, Net, Current + References No definition available. + Details
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Namespace Prefix: | abm_
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- Definition Contract with Customer, Liabilities [Roll Forward] + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Contract with Customer, Liability, Increase (Decrease) for Additional Contract Liabilities + References No definition available. + Details
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Namespace Prefix: | abm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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