Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Jul. 31, 2018
Accounting Policies [Abstract]
Basis of presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with (i) United States generally accepted accounting principles (“U.S. GAAP”) for interim financial information and (ii) the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of our management, our unaudited consolidated financial statements and accompanying notes (the “Financial Statements”) include all normal recurring adjustments that are necessary for the fair statement of the interim periods presented. Interim results of operations are not necessarily indicative of results for the full year. The Financial Statements should be read in conjunction with our audited consolidated financial statements (and notes thereto) in our Annual Report on Form 10-K for the fiscal year ended October 31, 2017. Unless otherwise indicated, all references to years are to our fiscal year, which ends on October 31.
Business combinations policy	On September 1, 2017 (the “Acquisition Date”), we completed the acquisition of GCA Services Group (“GCA”). Accordingly, our consolidated statements of comprehensive income (loss) and statements of cash flows include GCA’s results of operations in the three and nine months ended July 31, 2018, but exclude GCA’s results of operations in the three and nine months ended July 31, 2017, as that was prior to the Acquisition Date. See Note 3, “Acquisitions,” for further information on the acquisition of GCA.
Reclassifications policy	Effective November 1, 2017, we made changes to our operating structure as a result of the GCA acquisition. To reflect these changes, certain prior year amounts, including operating segment data, have been reclassified to conform with our fiscal 2018 presentation. These changes had no impact on our previously reported consolidated balance sheets, statements of comprehensive income (loss), or statements of cash flows. See Note 12, “Segment Information,” for further details.
Management reimbursement revenue by segment	We operate certain parking facilities under managed location arrangements. Under these arrangements, we manage the parking facility for a management fee and pass through the revenue and expenses associated with the facility to the owner. These revenues and expenses are reported in equal amounts as costs reimbursed from our managed locations
New accounting pronouncements	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, establishing Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers. The FASB subsequently issued several clarifying ASUs, collectively referred to as “ASC 606,” that introduce a new principles-based framework for revenue recognition and disclosure. The core requirement of the standard is when an entity transfers goods or services to customers it will recognize revenue in an amount that reflects the consideration the entity expects to be entitled to for those goods or services. ASC 606 allows either a full retrospective adoption to all periods presented or a modified retrospective adoption approach with a cumulative-effect adjustment to retained earnings as of the beginning of the year of adoption. To assess the impact of this standard, we have established a cross-functional implementation team consisting of representatives from all of our operating segments. The implementation team is completing the analysis of our contract portfolio to identify potential differences that would result from applying the requirements of this new standard. In addition, we continue to identify and implement the appropriate changes to our business processes and controls to support revenue recognition and the expanded disclosures required under this new standard. We expect adoption of this standard to have an impact on the timing of revenue recognition related to certain lines of business and the financial statement line item reporting of certain items. Additionally, the accounting for certain direct and incremental contract costs is significantly different from our current capitalization policy; however, the full impact of this difference is currently unknown. We are continuing to evaluate the impact of this standard and an estimate of the impact to our consolidated financial statements cannot be made at this time. We expect to adopt ASC 606 on November 1, 2018 using the modified retrospective approach, under which we will present the cumulative effect of adoption as an adjustment to the opening balance of retained earnings at the adoption date. No other recently issued standards are expected to have a significant impact on our fiscal 2019 consolidated financial statements.