Acquisitions	9 Months Ended
Jul. 31, 2017
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS Acquisition of GCA Services Group On July 11, 2017, we entered into an Agreement and Plan of Merger with GCA Holding Corp. (the “Merger Agreement”) to acquire GCA Services Group. On September 1, 2017, we completed the acquisition pursuant to the Merger Agreement. Refer to Note 15, “Subsequent Events,” for additional details. Other Acquisitions Effective December 1, 2016, we acquired all of the outstanding stock of Mechanical Solutions, Inc. (“MSI”), a provider of specialized HVAC, chiller, and plumbing services, for a purchase price of $12.6 million. The purchase price includes up to $1.0 million of undiscounted contingent consideration that is based on the expected achievement of certain pre-established revenue goals. See Note 7, “Fair Value of Financial Instruments,” regarding our valuation of contingent consideration liabilities. As of December 1, 2016, the operations of MSI are included in our Technical Solutions segment. Effective December 1, 2016, we also acquired all of the outstanding stock of OFJ Connections Ltd (“OFJ”), a provider of airport transportation services in the United Kingdom, for a purchase price of $6.3 million. As of December 1, 2016, the operations of OFJ are included in our Aviation segment. Effective September 30, 2016, we acquired all of the outstanding stock of BRBIBR Limited, a company which holds all of the outstanding shares of 8 Solutions Ltd. (“8 Solutions”), a provider of technical cleaning services to data centers in the United Kingdom and certain other locations, for a purchase price of $16.1 million. As of September 30, 2016, the operations of 8 Solutions are included in our Business & Industry segment. 8 Solutions has been renamed ABM Critical Solutions Limited. Effective December 1, 2015, we acquired all of the outstanding stock of Westway Services Holdings (2014) Ltd. (“Westway”), a provider of technical services to clients in the United Kingdom, for a purchase price of $81.0 million. This acquisition expanded the geographical reach of our technical solutions business to the United Kingdom, resulting in the allocation of a significant portion of the purchase price to goodwill. As such, we recorded goodwill and intangible assets of $53.8 million and $22.5 million, respectively. The goodwill associated with this acquisition is not deductible for tax purposes. As of December 1, 2015, the operations of Westway are included in our Technical Solutions segment. Pro Forma and Other Supplemental Financial Information Pro forma and other supplemental financial information is not presented for our other acquisitions, as they are not considered material business combinations individually or on a combined basis.

ACQUISITIONS

Acquisition of GCA Services Group

On July 11, 2017, we entered into an Agreement and Plan of Merger with GCA Holding Corp. (the “Merger Agreement”) to acquire GCA Services Group. On September 1, 2017, we completed the acquisition pursuant to the Merger Agreement. Refer to Note 15, “Subsequent Events,” for additional details.

Other Acquisitions

Effective December 1, 2016, we acquired all of the outstanding stock of Mechanical Solutions, Inc. (“MSI”), a provider of specialized HVAC, chiller, and plumbing services, for a purchase price of $12.6 million. The purchase price includes up to $1.0 million of undiscounted contingent consideration that is based on the expected achievement of certain pre-established revenue goals. See Note 7, “Fair Value of Financial Instruments,” regarding our valuation of contingent consideration liabilities. As of December 1, 2016, the operations of MSI are included in our Technical Solutions segment.

Effective December 1, 2016, we also acquired all of the outstanding stock of OFJ Connections Ltd (“OFJ”), a provider of airport transportation services in the United Kingdom, for a purchase price of $6.3 million. As of December 1, 2016, the operations of OFJ are included in our Aviation segment.

Effective September 30, 2016, we acquired all of the outstanding stock of BRBIBR Limited, a company which holds all of the outstanding shares of 8 Solutions Ltd. (“8 Solutions”), a provider of technical cleaning services to data centers in the United Kingdom and certain other locations, for a purchase price of $16.1 million. As of September 30, 2016, the operations of 8 Solutions are included in our Business & Industry segment. 8 Solutions has been renamed ABM Critical Solutions Limited.

Effective December 1, 2015, we acquired all of the outstanding stock of Westway Services Holdings (2014) Ltd. (“Westway”), a provider of technical services to clients in the United Kingdom, for a purchase price of $81.0 million. This acquisition expanded the geographical reach of our technical solutions business to the United Kingdom, resulting in the allocation of a significant portion of the purchase price to goodwill. As such, we recorded goodwill and intangible assets of $53.8 million and $22.5 million, respectively. The goodwill associated with this acquisition is not deductible for tax purposes. As of December 1, 2015, the operations of Westway are included in our Technical Solutions segment.

Pro Forma and Other Supplemental Financial Information

Pro forma and other supplemental financial information is not presented for our other acquisitions, as they are not considered material business combinations individually or on a combined basis.