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Revenues - Contract with Customer, Asset and Liability (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Jul. 31, 2020 | Oct. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Billed trade receivables | $ 829,300,000 | $ 978,700,000
Unbilled trade receivables | 52,200,000 | 56,900,000
Costs incurred in excess of amounts billed | 72,500,000 | 72,600,000
Capitalized commissions | 22,600,000 | $ 21,800,000
Capitalized contract price | 10,600,000 |
Capitalized contract cost, amortization | (9,800,000) |
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 | 246,100,000 |
Recognition of deferred revenue | (241,700,000) |
Contract liabilities, balance at end of period | $ 42,300,000 |

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- Definition Contract with Customer, Asset, Billed Trade Receivable, 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, Unbilled Trade Receivables, Current + References No definition available. + Details
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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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- Definition Contract with Customer, Liabilities [Roll Forward] + 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_
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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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X
- 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=118944033&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=118944033&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=118956577&loc=SL49130549-203045 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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