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REVENUES - Contract with Customer, Asset and Liability (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Jul. 31, 2022 | Oct. 31, 2021
Revenue from Contract with Customer [Abstract] |  |
Billed trade receivables | $ 1,078,000,000 | $ 1,057,600,000
Unbilled trade receivables | 190,300,000 | 112,100,000
Costs incurred in excess of amounts billed | 78,700,000 | 52,500,000
Capitalized commissions | 29,600,000 | $ 27,800,000
Capitalized contract price | 12,200,000 |
Capitalized contract cost, amortization | 10,500,000 |
Capitalized contract cost, impairment loss | 0 |
Contract with Customer, Liabilities [Roll Forward] |  |
Contract liabilities, balance at beginning of period | 58,500,000 |
Additional contract liabilities | 165,200,000 |
Recognition of deferred revenue | (165,100,000) |
Contract liabilities, balance at end of period | $ 58,600,000 |

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- Definition Contract With Customer, Asset, Billed Trade Receivable, Current + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Contract With Customer, Asset, Capitalized Commissions + 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, Costs Incurred In Excess Of Amounts Billed, Current + References No definition available. + Details
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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
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- Definition Contract With Customer, Asset, Unbilled Trade Receivables, Current + References No definition available. + Details
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- Definition Contract With Customer, Liability, Including New Contract Revenue Recognized + References No definition available. + Details
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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
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- Definition Contract with Customer, Liabilities [Roll Forward] + 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 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 https://asc.fasb.org/extlink&oid=126905575&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 https://asc.fasb.org/extlink&oid=126905575&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 https://asc.fasb.org/extlink&oid=126919976&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 https://asc.fasb.org/extlink&oid=126919976&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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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