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EMPLOYEE BENEFIT PLANS - Schedule of Multiemployer Defined Benefit Pension Plans (Details) - Multiemployer Plans, Pension Plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022
Multiemployer Plans [Line Items] |  |  |
Total Contributions | $ 77.3 | $ 73.6 | $ 73.8
Building Service 32BJ Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, significant | 22.1 | 21.4 | 22.7
S.E.I.U National Industry Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, significant | 19.4 | 19.3 | 17.6
Central Pension Fund of the IUOE & Participating Employers |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, significant | 12.4 | 13.0 | 12.8
SEIU Local 1 & Participating Employers Pension Trust |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, significant | 4.3 | 4.8 | 5.8
Western Conference of Teamsters Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, significant | 2.7 | 2.4 | 2.2
IUOE Stationary Engineers Local 39 Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, significant | 2.5 | 4.6 | 4.4
All Other Plans |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions by ABM, insignificant | $ 13.9 | $ 8.0 | $ 8.2

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