XML 38 R21.htm IDEA: XBRL DOCUMENT
v3.22.1

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
--- | ---
Apr. 30, 2022
Accounting Policies [Abstract] |
Schedule of Management Reimbursement Revenue by Segment | These revenues and expenses are reported in equal amounts as costs reimbursed from our managed locations:
| Three Months Ended April 30, |  | Six Months Ended April 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021
Business & Industry | $ | 53.9 |  |  | $ | 43.2 |  |  | $ | 106.4 |  |  | $ | 86.6 |
Aviation | 12.5 |  |  | 12.9 |  |  | 24.8 |  |  | 26.5 |
Total | $ | 66.4 |  |  | $ | 56.1 |  |  | $ | 131.3 |  |  | $ | 113.1 |

X
- Definition Management Revenue [Table Text Block] + References No definition available. + Details
Name: | abm_ManagementRevenueTableTextBlock
Namespace Prefix: | abm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration