XML 60 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Auction Rate Securities - Significant Assumptions Used to Determine Fair Value of Auction Rate Securities (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Oct. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |
Libor plus stated yield | 2.00% | 2.00%
Yields | 2.15% | 2.15%
Minimum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rates | 0.47% | 0.42%
Average expected lives | 4 years | 4 years
Maximum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Discount rates | 0.74% | 0.79%
Average expected lives | 10 years | 10 years

X
- Definition The average expected life assumptions used to determine the fair value of auction rate securities. + References No definition available. + Details
Name: | abm_AverageExpectedLifeAuctionRateSecurities
Namespace Prefix: | abm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The discount rate over London Interbank Offered Rate assumptions used to determine the fair value of auction rate securities. + References No definition available. + Details
Name: | abm_SecuritiesDiscountRateOverLondonInterbankOfferedRate
Namespace Prefix: | abm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fixed yield used as an input in determining the fair value for one of the Company's auction rate securities. + References No definition available. + Details
Name: | abm_SecuritiesYields
Namespace Prefix: | abm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fixed yield over London Interbank Offered Rate used as an input in determining the fair value for the one of the Company's auction rate securities. + References No definition available. + Details
Name: | abm_SecuritiesYieldsOverLondonInterbankOfferedRate
Namespace Prefix: | abm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |