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Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended
Oct. 31, 2014
May 01, 2015
Subsequent Event [Line Items]    
Business acquisition aggregate purchase price $ 53.0us-gaap_BusinessCombinationConsiderationTransferred1  
CTS Services/Facility Support Services | Subsequent Event    
Subsequent Event [Line Items]    
Business acquisition aggregate purchase price   20.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= abm_CTSServicesFacilitySupportServicesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Contingent consideration maximum amount payable   $ 3.8us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= abm_CTSServicesFacilitySupportServicesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember