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Employee Benefit Plans - Multiemployer Defined Benefit Pension Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 94-1369354 |  |
Multiemployer Plans, Pension Plans |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM | $ 66.6 | $ 65.3 | $ 63.1
Multiemployer Plans, Pension Plans | Minimum |  |  |
Multiemployer Plans [Line Items] |  |  |
Green Zone funded percent - Minimum | 80.00% | 80.00% |
Multiemployer Plans, Pension Plans | Maximum |  |  |
Multiemployer Plans [Line Items] |  |  |
Red Zone funded percent - Maximum | 65.00% | 65.00% |
Yellow Zone funded percent - Maximum | 80.00% | 80.00% |
Multiemployer Plans, Pension Plans | Building Service 32BJ Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 13-1879376 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Red | Red |
Pension Protection Act Zone Status, Date | Jun. 30, 2018 | Jun. 30, 2017 |
FIP/RP Status Pending/Implemented | Implemented |  |
Contributions by ABM | $ 19.3 | $ 19.9 | 20.1
Surcharge Imposed | No |  |
Expiration Dates of Collective Bargaining Agreements, Last | Dec. 31, 2019 |  |
Multiemployer Plans, Pension Plans | Central Pension Fund of the IUOE & Participating Employers |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 36-6052390 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Green | Green |
Pension Protection Act Zone Status, Date | Jan. 31, 2019 | Jan. 31, 2018 |
FIP/RP Status Pending/Implemented | NA |  |
Contributions by ABM | $ 11.7 | $ 11.0 | 10.7
Surcharge Imposed | NA |  |
Expiration Dates of Collective Bargaining Agreements, First | Apr. 30, 2020 |  |
Expiration Dates of Collective Bargaining Agreements, Last | Dec. 31, 2022 |  |
Multiemployer Plans, Pension Plans | S.E.I.U. National Industry Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 52-6148540 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Red | Red |
Pension Protection Act Zone Status, Date | Dec. 31, 2018 | Dec. 31, 2017 |
FIP/RP Status Pending/Implemented | Implemented |  |
Contributions by ABM | $ 10.6 | $ 8.7 | 7.2
Surcharge Imposed | Yes |  |
Expiration Dates of Collective Bargaining Agreements, First | Apr. 30, 2020 |  |
Expiration Dates of Collective Bargaining Agreements, Last | Jan. 31, 2023 |  |
Multiemployer Plans, Pension Plans | SEIU Local 1 & Participating Employers Pension Trust |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 36-6486542 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Green | Green |
Pension Protection Act Zone Status, Date | Sep. 30, 2018 | Sep. 30, 2017 |
FIP/RP Status Pending/Implemented | NA |  |
Contributions by ABM | $ 5.1 | $ 5.8 | 6.0
Surcharge Imposed | NA |  |
Expiration Dates of Collective Bargaining Agreements, Last | Apr. 04, 2021 |  |
Multiemployer Plans, Pension Plans | IUOE Stationary Engineers Local 39 Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 94-6118939 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Green | Green |
Pension Protection Act Zone Status, Date | Dec. 31, 2018 | Dec. 31, 2017 |
FIP/RP Status Pending/Implemented | NA |  |
Contributions by ABM | $ 4.6 | $ 5.2 | 4.8
Surcharge Imposed | NA |  |
Expiration Dates of Collective Bargaining Agreements, First | Nov. 30, 2020 |  |
Expiration Dates of Collective Bargaining Agreements, Last | Aug. 31, 2023 |  |
Multiemployer Plans, Pension Plans | Local 68 Engineers Union Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 51-0176618 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Yellow | Red |
Pension Protection Act Zone Status, Date | Jun. 30, 2018 | Jun. 30, 2017 |
FIP/RP Status Pending/Implemented | Implemented |  |
Contributions by ABM | $ 3.2 | $ 3.0 | 2.8
Surcharge Imposed | No |  |
Expiration Dates of Collective Bargaining Agreements, First | Apr. 30, 2020 |  |
Expiration Dates of Collective Bargaining Agreements, Last | Aug. 31, 2022 |  |
Multiemployer Plans, Pension Plans | Western Conference of Teamsters Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Entity Tax Identification Number | 91-6145047 |  |
Multiemployer Plan Number | 001 |  |
Pension Protection Act Zone Status | Green | Green |
Pension Protection Act Zone Status, Date | Dec. 31, 2018 | Dec. 31, 2017 |
FIP/RP Status Pending/Implemented | NA |  |
Contributions by ABM | $ 3.1 | $ 3.1 | 3.5
Surcharge Imposed | NA |  |
Expiration Dates of Collective Bargaining Agreements, First | May 31, 2020 |  |
Expiration Dates of Collective Bargaining Agreements, Last | Dec. 31, 2022 |  |
Multiemployer Plans, Pension Plans | All Other Plans |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM | $ 9.0 | $ 8.5 | $ 8.0

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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12 -Subsection b-2 + Details
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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Three digit plan number for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Date of the multiemployer plan's year end to which the certified zone status relates, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire first in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire last in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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