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Basis of Presentation	6 Months Ended
Basis of Presentation	Mar. 31, 2016
Basis of Presentation
Basis of Presentation	1.Basis of Presentation Effective January 5, 2015, the official name of the Company changed from AECOM Technology Corporation to AECOM. The accompanying consolidated financial statements of AECOM (the Company) are unaudited and, in the opinion of management, include all adjustments, including all normal recurring items necessary for a fair statement of the Company’s financial position and results of operations for the periods presented. All inter-company balances and transactions are eliminated in consolidation. The consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Form 10-K for the fiscal year ended September 30, 2015 (the Annual Report). The accompanying unaudited consolidated financial statements and related notes have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. Certain immaterial reclassifications were made to the prior year to conform to current year presentation. The consolidated financial statements included in this report have been prepared consistently with the accounting policies described in the Annual Report and should be read together with the Annual Report. The results of operations for the three and six months ended March 31, 2016 are not necessarily indicative of the results to be expected for the fiscal year ending September 30, 2016. The Company reports its annual results of operations based on 52 or 53-week periods ending on the Friday nearest September 30. The Company reports its quarterly results of operations based on periods ending on the Friday nearest December 31, March 31, and June 30. For clarity of presentation, all periods are presented as if the periods ended on September 30, December 31, March 31, and June 30.