XML 53 R28.htm IDEA: XBRL DOCUMENT
v3.20.4

Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Oct. 31, 2020
Accounting Policies [Abstract] |
Schedule of Estimated Useful Lives of Property, Plant and Equipment | We determine depreciation for financial reporting purposes using the straight-line method over the following estimated useful lives:
Category | Years
Computer equipment and software | 3–5
Machinery and other equipment | 3–5
Transportation equipment | 1.5–10
Buildings | 10–40
Furniture and fixtures | 5
Schedule of Management Reimbursement Revenue by Segment |
| Years Ended October 31,
(in millions) | 2020 |  | 2019 |  | 2018
Business & Industry | $ | 221.4 |  |  | $ | 283.1 |  |  | $ | 276.6 |
Aviation | 74.3 |  |  | 95.5 |  |  | 99.9 |
Total | $ | 295.6 |  |  | $ | 378.7 |  |  | $ | 376.4 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | The impact of adoption of Topic 842 on our Consolidated Balance Sheet was as follows:
(in millions) |  | Balance at October 31, 2019 |  | Adjustments Due to Adoption of Topic 842 |  | Balance at November 1, 2019
ASSETS |  |  |  |  |  |
Right-of-use assets(1) |  | $ | — |  |  | $ | 167.5 |  |  | $ | 167.5 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |
Current portion of lease liabilities(2) |  | $ | — |  |  | $ | 36.3 |  |  | $ | 36.3 |
Other accrued liabilities(3) |  | 158.2 |  |  | (3.0) |  |  | 155.2 |
Long-term lease liabilities(4) |  | — |  |  | 154.2 |  |  | 154.2 |
Other noncurrent liabilities(5) |  | 78.8 |  |  | (20.0) |  |  | 58.8 |
(1) Represents capitalization of operating lease assets and reclassification of prepaid rent, deferred rent, lease exit impairment liabilities, and lease incentives and tenant improvements on operating leases. (2) Represents the recognition of short-term operating lease liabilities. (3) Represents short-term deferred rent reclassified to ROU assets. (4) Represents the recognition of long-term operating lease liabilities. (5) Represents long-term deferred rent, lease incentives and tenant improvements, and lease exit impairment liabilities reclassified to ROU assets.

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

X
- Definition Property, Plant, and Equipment, Estimated Useful Lives [Table Text Block] + References No definition available. + Details
Name: | abm_PropertyPlantandEquipmentEstimatedUsefulLivesTableTextBlock
Namespace Prefix: | abm_
Data Type: | nonnum: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

X
- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
Name: | us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration