AECOM (ACM) 10-Q 11 May 22 2022 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2022	May 05, 2022
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	000-52423
Entity Registrant Name	AECOM
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	61-1088522
Entity Address, Address Line One	13355 Noel Road
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75240
City Area Code	972
Local Phone Number	788-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	ACM
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		141,038,478
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Central Index Key	0000868857

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 829,719	$ 1,120,790
Cash in consolidated joint ventures	135,351	108,406
Total cash and cash equivalents	965,070	1,229,196
Accounts receivable-net	2,450,085	2,619,491
Contract assets	1,391,380	1,369,031
Prepaid expenses and other current assets	753,727	739,044
Current assets held for sale	77,662	139,426
Income taxes receivable	59,252	77,355
TOTAL CURRENT ASSETS	5,697,176	6,173,543
PROPERTY AND EQUIPMENT-NET	391,564	398,876
DEFERRED TAX ASSETS-NET	361,319	360,260
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	341,452	328,906
GOODWILL	3,490,544	3,502,499
INTANGIBLE ASSETS-NET	45,486	54,867
OTHER NON-CURRENT ASSETS	291,142	307,927
OPERATING LEASE RIGHT-OF-USE ASSETS	570,603	607,076
NON-CURRENT ASSETS HELD FOR SALE	6,777
TOTAL ASSETS	11,196,063	11,733,954
CURRENT LIABILITIES:
Short-term debt	3,351	4,369
Accounts payable	1,915,617	2,090,479
Accrued expenses and other current liabilities	2,218,969	2,174,201
Income taxes payable	61,877	50,511
Contract liabilities	996,275	1,058,643
Current liabilities held for sale	47,940	94,043
Current portion of long-term debt	39,449	49,469
TOTAL CURRENT LIABILITIES	5,283,478	5,521,715
OTHER LONG-TERM LIABILITIES	104,355	145,444
OPERATING LEASE LIABILITIES, NON-CURRENT	636,236	679,059
LONG-TERM LIABILITIES HELD FOR SALE	345	11,095
DEFERRED TAX LIABILITY-NET	5,310	5,420
PENSION BENEFIT OBLIGATIONS	350,376	383,904
LONG-TERM DEBT	2,166,310	2,157,740
TOTAL LIABILITIES	8,546,410	8,904,377
COMMITMENTS AND CONTINGENCIES (Note 15)
AECOM STOCKHOLDERS' EQUITY:
Common stock-authorized, 300,000,000 shares of $0.01 par value as of March 31, 2022 and September 30, 2021; issued and outstanding 140,742,683 and 143,168,815 shares as of March 31, 2022 and September 30, 2021, respectively	1,407	1,432
Additional paid-in capital	4,100,905	4,115,541
Accumulated other comprehensive loss	(864,087)	(900,377)
Accumulated deficits	(706,783)	(504,126)
TOTAL AECOM STOCKHOLDERS' EQUITY	2,531,442	2,712,470
Noncontrolling interests	118,211	117,107
TOTAL STOCKHOLDERS' EQUITY	2,649,653	2,829,577
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 11,196,063	$ 11,733,954

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2022	Sep. 30, 2021
Consolidated Balance Sheets
Common stock, authorized shares	300,000,000	300,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued shares	140,742,683	143,168,815
Common stock, outstanding shares	140,742,683	143,168,815

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Consolidated Statements of Operations
Revenue	$ 3,213,658	$ 3,265,573	$ 6,480,374	$ 6,578,728
Cost of revenue	3,003,706	3,070,314	6,070,218	6,199,099
Gross profit	209,952	195,259	410,156	379,629
Equity in earnings of joint ventures	11,919	7,157	19,869	15,358
General and administrative expenses	(37,098)	(36,007)	(73,599)	(74,367)
Restructuring costs	(73,292)	(8,746)	(76,663)	(21,784)
Income from operations	111,481	157,663	279,763	298,836
Other income	3,329	3,477	6,203	7,330
Interest expense	(24,173)	(32,800)	(49,556)	(63,451)
Income from continuing operations before taxes	90,637	128,340	236,410	242,715
Income tax expense for continuing operations	36,011	35,148	58,567	60,749
Net income from continuing operations	54,626	93,192	177,843	181,966
Net loss from discontinued operations	(6,113)	(47,914)	(68,053)	(103,666)
Net income	48,513	45,278	109,790	78,300
Net income attributable to noncontrolling interests from continuing operations	(5,592)	(4,845)	(11,048)	(10,259)
Net (income) loss attributable to noncontrolling interests from discontinued operations	(1,364)	(1,074)	4,363	(2,554)
Net income attributable to noncontrolling interests	(6,956)	(5,919)	(6,685)	(12,813)
Net income attributable to AECOM from continuing operations	49,034	88,347	166,795	171,707
Net loss attributable to AECOM from discontinued operations	(7,477)	(48,988)	(63,690)	(106,220)
Net income attributable to AECOM	$ 41,557	$ 39,359	$ 103,105	$ 65,487
Net income (loss) attributable to AECOM per share:
Basic continuing operations per share	$ 0.35	$ 0.60	$ 1.18	$ 1.15
Basic discontinued operations per share	(0.06)	(0.33)	(0.45)	(0.71)
Basic earnings per share	0.29	0.27	0.73	0.44
Diluted continuing operations per share	0.34	0.59	1.16	1.13
Diluted discontinued operations per share	(0.05)	(0.33)	(0.44)	(0.70)
Diluted earnings per share	$ 0.29	$ 0.26	$ 0.72	$ 0.43
Weighted average shares outstanding:
Basic	141,060	147,770	141,419	149,597
Diluted	142,626	149,519	143,631	151,632

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Consolidated Statements of Comprehensive Income
Net income	$ 48,513	$ 45,278	$ 109,790	$ 78,300
Other comprehensive income (loss), net of tax:
Net unrealized gain on derivatives, net of tax	17,087	1,064	20,636	1,953
Foreign currency translation adjustments	9,096	(20,065)	3,899	31,886
Pension adjustments, net of tax	9,030	42	11,763	(10,711)
Other comprehensive income (loss), net of tax	35,213	(18,959)	36,298	23,128
Comprehensive income, net of tax	83,726	26,319	146,088	101,428
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	(7,084)	(5,904)	(6,693)	(13,003)
Comprehensive income attributable to AECOM, net of tax	$ 76,642	$ 20,415	$ 139,395	$ 88,425

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings/ (Accumulated Deficits) [Member]Cumulative effect of accounting standard adoption	Retained Earnings/ (Accumulated Deficits) [Member]	Parent [Member]Cumulative effect of accounting standard adoption	Parent [Member]	Noncontrolling Interest [Member]	Cumulative effect of accounting standard adoption	Total
BALANCE at Sep. 30, 2020	$ 1,570	$ 4,035,414	$ (918,674)		$ 174,248		$ 3,292,558	$ 120,986		$ 3,413,544
Increase (Decrease) in Stockholders' Equity
Net income					65,487		65,487	12,813		78,300
Other comprehensive income (loss)			22,938				22,938	190		23,128
Issuance of stock	19	16,995					17,014			17,014
Repurchases of stock	(121)	(22,942)			(568,608)		(591,671)			(591,671)
Stock based compensation		24,622					24,622			24,622
Disposal of noncontrolling interest of business sold								(24,039)		(24,039)
Other transactions with noncontrolling interests								580		580
Contributions from noncontrolling interests								226		226
Distributions to noncontrolling interests								(7,025)		(7,025)
BALANCE at Mar. 31, 2021	1,468	4,054,089	(895,736)	$ (7,979)	(336,852)	$ (7,979)	2,822,969	103,731	$ (7,979)	2,926,700
BALANCE at Dec. 31, 2020	1,486	4,038,149	(876,792)		(254,639)		2,908,204	111,973		3,020,177
Increase (Decrease) in Stockholders' Equity
Net income					39,359		39,359	5,919		45,278
Other comprehensive income (loss)			(18,944)				(18,944)	(15)		(18,959)
Issuance of stock	4	7,901					7,905			7,905
Repurchases of stock	(22)	(1,220)			(121,572)		(122,814)			(122,814)
Stock based compensation		9,259					9,259			9,259
Disposal of noncontrolling interest of business sold								(10,969)		(10,969)
Other transactions with noncontrolling interests								(1,727)		(1,727)
Contributions from noncontrolling interests								147		147
Distributions to noncontrolling interests								(1,597)		(1,597)
BALANCE at Mar. 31, 2021	1,468	4,054,089	(895,736)	$ (7,979)	(336,852)	$ (7,979)	2,822,969	103,731	$ (7,979)	2,926,700
BALANCE at Sep. 30, 2021	1,432	4,115,541	(900,377)		(504,126)		2,712,470	117,107		2,829,577
Increase (Decrease) in Stockholders' Equity
Net income					103,105		103,105	6,685		109,790
Other comprehensive income (loss)			36,290				36,290	8		36,298
Dividends declared					(42,951)		(42,951)			(42,951)
Issuance of stock	19	13,584					13,603			13,603
Repurchases of stock	(44)	(49,939)			(262,811)		(312,794)			(312,794)
Stock based compensation		21,719					21,719			21,719
Other transactions with noncontrolling interests								(118)		(118)
Contributions from noncontrolling interests								2		2
Distributions to noncontrolling interests								(5,473)		(5,473)
BALANCE at Mar. 31, 2022	1,407	4,100,905	(864,087)		(706,783)		2,531,442	118,211		2,649,653
BALANCE at Dec. 31, 2021	1,413	4,085,333	(899,172)		(676,902)		2,510,672	115,567		2,626,239
Increase (Decrease) in Stockholders' Equity
Net income					41,557		41,557	6,956		48,513
Other comprehensive income (loss)			35,085				35,085	128		35,213
Dividends declared					(21,445)		(21,445)			(21,445)
Issuance of stock		4,154					4,154			4,154
Repurchases of stock	(6)	(487)			(49,993)		(50,486)			(50,486)
Stock based compensation		11,905					11,905			11,905
Other transactions with noncontrolling interests								35		35
Distributions to noncontrolling interests								(4,475)		(4,475)
BALANCE at Mar. 31, 2022	$ 1,407	$ 4,100,905	$ (864,087)		$ (706,783)		$ 2,531,442	$ 118,211		$ 2,649,653

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 109,790	$ 78,300
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	85,176	80,828
Equity in earnings of unconsolidated joint ventures	(16,519)	(23,384)
Distribution of earnings from unconsolidated joint ventures	13,407	16,705
Non-cash stock compensation	21,719	24,622
Impairment of long-lived assets		95,814
Loss on sale of discontinued operations	45,586	50,117
Foreign currency translation	14,588	(8,304)
Other	8,059	5,378
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable and contract assets	139,651	259,059
Prepaid expenses and other assets	67,791	(281,745)
Accounts payable	(197,252)	(242,527)
Accrued expenses and other current liabilities	74,731	25,495
Contract liabilities	(62,417)	35,325
Other long-term liabilities	(111,082)	(49,429)
Net cash provided by operating activities	193,228	66,254
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for sale of discontinued operations including cash disposed	(43,690)	(259,933)
Investment in unconsolidated joint ventures	(12,335)	(40,086)
Return of investment in unconsolidated joint ventures	1,731	2,880
Proceeds from sale of investments	8,312	11,792
Proceeds from disposal of property and equipment	579	10,120
Payments for capital expenditures	(48,489)	(87,265)
Net cash used in investing activities	(93,892)	(362,492)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	1,335,742	1,251,766
Repayments of borrowings under credit agreements	(1,363,012)	(1,229,856)
Cash paid for debt issuance costs	(155)	(4,321)
Dividends paid	(21,198)
Proceeds from issuance of common stock	12,034	11,531
Proceeds from exercise of stock options		4,038
Payments to repurchase common stock	(312,794)	(591,671)
Net distributions to noncontrolling interests	(5,471)	(6,799)
Other financing activities	(13,777)	(15,101)
Net cash used in financing activities	(368,631)	(580,413)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	1,674	4,665
NET DECREASE IN CASH AND CASH EQUIVALENTS	(267,621)	(871,986)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,234,792	1,818,249
CASH AND CASH EQUIVALENTS AT END OF PERIOD	967,171	946,263
LESS CASH AND CASH EQUIVALENTS INCLUDED IN CURRENT ASSETS HELD FOR SALE	(2,101)	(11,357)
CASH AND CASH EQUIVALENTS OF CONTINUING OPERATIONS AT END OF PERIOD	$ 965,070	$ 934,906

Basis of Presentation

Basis of Presentation	6 Months Ended
	Mar. 31, 2022
Basis of Presentation
Basis of Presentation	1. Basis of Presentation ​ 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 intercompany 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, 2021 (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 United States (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. ​ The consolidated financial statements included in this report have been prepared consistently with the accounting policies described in the Annual Report, except as noted, and should be read together with the Annual Report. Certain reclassifications were made to the prior year to conform to current year presentation. Prior period's disaggregated revenue by geographic region reclassifies the India business to Europe, Middle East and Africa to conform with current operations. ​ The results of operations for the three and six months ended March 31, 2022 are not necessarily indicative of the results to be expected for the fiscal year ending September 30, 2022. ​ As discussed in more detail in Note 3, the Company concluded that its self-perform at-risk construction businesses met the criteria for held for sale beginning in the first quarter of fiscal 2020 and met the criteria for discontinued operation classification. As a result, the self-perform at-risk construction businesses are presented in the consolidated statements of operations as discontinued operations for all periods presented. Current and non-current assets and liabilities of these businesses are presented in the consolidated balance sheets as assets and liabilities held for sale. ​ 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.

New Accounting Pronouncements a

New Accounting Pronouncements and Changes in Accounting	6 Months Ended
	Mar. 31, 2022
New Accounting Pronouncements and Changes in Accounting
New Accounting Pronouncements and Changes in Accounting	2. New Accounting Pronouncements and Changes in Accounting ​ In June 2016, the Financial Accounting Standards Board (FASB) issued a new credit loss standard that changes the impairment model for most financial assets and some other instruments. The new guidance replaces the “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. It also simplifies the accounting model for purchased credit-impaired debt securities and loans. The Company adopted the new guidance effective October 1, 2020 using a modified retrospective approach that resulted in an $8.0 million, net of tax, reduction to retained earnings without restating comparative periods. Additional disclosures regarding the adoption can be found in Note 4. ​ In August 2018, the FASB issued new accounting guidance for the disclosure requirements of defined benefit pension plans. The amended guidance eliminates certain disclosure requirements that were no longer considered to be cost beneficial. The Company adopted the new guidance starting on October 1, 2021. Adoption of the new guidance did not have a significant impact on the Company’s financial statements. ​ In December 2019, the FASB issued new accounting guidance which simplifies the accounting for income taxes. The guidance amends certain exceptions to the general principles of Accounting Standards Codification (ASC) 740, Income Taxes ​ In October 2021, the FASB issued final guidance to companies that apply ASC 606, Revenue from Contracts with Customers ​

Discontinued Operations, Goodwi

Discontinued Operations, Goodwill and Intangible Assets	6 Months Ended
	Mar. 31, 2022
Discontinued Operations, Goodwill and Intangible Assets
Discontinued Operations, Goodwill and Intangible Assets	3. Discontinued Operations, Goodwill and Intangible Assets ​ In the first quarter of fiscal 2020, management approved a plan to dispose via sale the Company’s self-perform at-risk construction businesses. These businesses include the Company’s civil infrastructure, power, and oil and gas construction businesses that were previously reported in the Company’s Construction Services segment. After consideration of the relevant facts, the Company concluded the assets and liabilities of its self-perform at-risk construction businesses met the criteria for classification as held for sale. The Company concluded the actual and proposed disposal activities represented a strategic shift that would have a major effect on the Company’s operations and financial results and qualified for presentation as discontinued operations in accordance with FASB ASC 205-20. Accordingly, the financial results of the self-perform at-risk construction businesses are presented in the Consolidated Statement of Operations as discontinued operations for all periods presented. Current and non-current assets and liabilities of these businesses not sold as of the balance sheet date are presented in the Consolidated Balance Sheets as assets and liabilities held for sale for both periods presented. ​ During the first quarter of fiscal 2021, the Company completed the sale of its power construction business to CriticalPoint Capital, LLC. The Company recorded an additional pre-tax loss on the sale of $17.3 million in fiscal 2021 related to payments for post-closing working capital adjustments. ​ The Company also completed the sale of its civil infrastructure construction business to affiliates of Oroco Capital in the second quarter of fiscal 2021. During the second quarter of fiscal 2021, the Company recorded a $32.8 million loss related to the sale of its civil infrastructure construction business. In the first half of fiscal 2022, the Company recorded an additional $43.9 million loss primarily related to revisions of estimates for its working capital obligation to be paid and contingent consideration receivable. Under the terms of the sale agreement, the Company made the required cash payments and delivered the cash and cash equivalents, including cash in consolidated joint ventures, on the balance sheet at closing. As a result, the Company recorded the net cash impact of the sale as a use of cash in the investing section of its statement of cash flows. On January 28, 2022, the Company completed the sale of its oil and gas construction business to affiliates of Graham Maintenance Services LP for a purchase price of $14 million, subject to cash, debt and working capital adjustments. The Company recorded a pre-tax gain of approximately $3.0 million on the sale, net of transaction costs. The following table represents summarized balance sheet information of assets and liabilities held for sale (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ 2022 2021 ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 2.1 ​ $ 5.6 Receivables and contract assets ​ 43.6 ​ ​ 90.3 Other ​ 32.0 ​ ​ 43.5 Current assets held for sale ​ $ 77.7 ​ $ 139.4 ​ ​ ​ ​ ​ ​ ​ Property and equipment, net ​ $ 6.8 ​ $ 52.9 Other ​ — ​ ​ 18.5 Write-down of assets to fair value less cost to sell ​ ​ — ​ ​ (71.4) Non-current assets held for sale ​ $ 6.8 ​ $ — ​ ​ ​ ​ ​ ​ ​ Accounts payable and accrued expenses ​ $ 47.9 ​ $ 88.5 Other ​ — ​ ​ 5.5 Current liabilities held for sale ​ $ 47.9 ​ $ 94.0 ​ ​ ​ ​ ​ ​ ​ Long-term liabilities held for sale ​ $ 0.3 ​ $ 11.1 ​ The following table represents summarized income statement information of discontinued operations (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended Six months ended ​ ​ March 31, ​ March 31, March 31, ​ March 31, ​ 2022 2021 2022 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 84.7 ​ $ 113.0 ​ $ 211.8 ​ $ 443.7 Cost of revenue ​ 84.3 ​ ​ 117.9 ​ ​ 229.6 ​ ​ 440.8 Gross profit (loss) ​ 0.4 ​ ​ (4.9) ​ ​ (17.8) ​ ​ 2.9 Equity in earnings of joint ventures ​ — ​ ​ 0.3 ​ ​ (3.4) ​ ​ 8.0 Loss on disposal activities ​ ​ (3.4) ​ ​ (38.8) ​ ​ (45.5) ​ ​ (50.1) Transaction costs ​ ​ (3.9) ​ ​ (2.7) ​ ​ (6.2) ​ ​ (13.6) Impairment of long-lived assets ​ ​ — ​ ​ — ​ ​ — ​ ​ (95.8) Loss from operations ​ (6.9) ​ ​ (46.1) ​ ​ (72.9) ​ ​ (148.6) Interest expense ​ — ​ ​ (0.1) ​ ​ (0.1) ​ ​ (0.3) Loss before taxes ​ (6.9) ​ ​ (46.2) ​ ​ (73.0) ​ ​ (148.9) Income tax (benefit) expense ​ (0.9) ​ ​ 1.7 ​ ​ (5.0) ​ ​ (45.2) Net loss from discontinuing operations ​ $ (6.0) ​ $ (47.9) ​ $ (68.0) ​ $ (103.7) ​ The significant components included in our Consolidated Statement of Cash Flows for the discontinued operations are as follows (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended Six months ended ​ ​ March 31, March 31, ​ March 31, March 31, ​ 2022 ​ 2021 2022 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Payments for capital expenditures ​ $ (0.6) ​ $ (1.6) ​ $ (1.5) ​ $ (4.6) ​ The changes in the carrying value of goodwill by reportable segment for the six months ended March 31, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ ​ September 30, ​ Exchange ​ March 31, ​ 2021 Impact 2022 ​ ​ (in millions) Americas ​ $ 2,626.4 ​ $ 2.2 ​ $ 2,628.6 International ​ 876.1 ​ ​ (14.2) ​ ​ 861.9 Total ​ $ 3,502.5 ​ $ (12.0) ​ $ 3,490.5 ​ The gross amounts and accumulated amortization of the Company’s acquired identifiable intangible assets with finite useful lives as of March 31, 2022 and September 30, 2021, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2022 ​ September 30, 2021 ​ ​ ​ ​ Gross ​ Accumulated ​ Intangible ​ Gross ​ Accumulated ​ Intangible ​ Amortization ​ Amount Amortization Assets, Net Amount Amortization Assets, Net Period ​ ​ (in millions) ​ (years) Backlog and customer relationships ​ $ 663.5 ​ $ (618.0) ​ $ 45.5 ​ $ 663.4 ​ $ (608.5) ​ $ 54.9 ​ 1 - 11 ​ Amortization expense of acquired intangible assets included within cost of revenue were $9.5 million and $10.7 million for the six months ended March 31, 2022 and 2021, respectively. The following table presents estimated amortization expense of existing intangible assets for the remainder of fiscal 2022 and for the succeeding years: ​ ​ ​ ​ ​ Fiscal Year (in millions) 2022 (six months remaining) ​ $ 9.2 2023 ​ 18.2 2024 ​ 17.4 2025 ​ 0.7 Total ​ $ 45.5 ​

Revenue Recognition

Revenue Recognition	6 Months Ended
	Mar. 31, 2022
Revenue Recognition
Revenue Recognition	4. Revenue Recognition ​ The Company follows accounting principles for recognizing revenue upon the transfer of control of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. The Company generally recognizes revenues over time as performance obligations are satisfied. The Company generally measures its progress to completion using an input measure of total costs incurred divided by total costs expected to be incurred, which it believes to be the best measure of progress towards completion of the performance obligation. In the course of providing its services, the Company routinely subcontracts for services and incurs other direct costs on behalf of its clients. These costs are passed through to clients and, in accordance with GAAP, are included in the Company’s revenue and cost of revenue. These pass-through revenues for the six months ended March 31, 2022 and 2021 were $3.3 billion and $3.5 billion, respectively. ​ Recognition of revenue and profit is dependent upon a number of factors, including the accuracy of a variety of estimates made at the balance sheet date, such as engineering progress, material quantities, the achievement of milestones, penalty provisions, labor productivity and cost estimates. Additionally, the Company is required to make estimates for the amount of consideration to be received, including bonuses, awards, incentive fees, claims, unpriced change orders, penalties, and liquidated damages. Variable consideration is included in the estimate of the transaction price only to the extent that a significant reversal would not be probable. Management continuously monitors factors that may affect the quality of its estimates, and material changes in estimates are disclosed accordingly. Costs attributable to claims are treated as costs of contract performance as incurred. ​ The following summarizes the Company’s major contract types: ​ Cost Reimbursable Contracts ​ Cost reimbursable contracts include cost-plus fixed fee, cost-plus fixed rate, and time-and-materials price contracts. Under cost-plus contracts, the Company charges clients for its costs, including both direct and indirect costs, plus a negotiated fee or rate. The Company recognizes revenue based on actual direct costs incurred and the applicable fixed rate or portion of the fixed fee earned as of the balance sheet date. Under time-and-materials price contracts, the Company negotiates hourly billing rates and charges its clients based on the actual time that it expends on a project. In addition, clients reimburse the Company for materials and other direct incidental expenditures incurred in connection with its performance under the contract. The Company may apply a practical expedient to recognize revenue in the amount in which it has the right to invoice if its right to consideration is equal to the value of performance completed to date. ​ Guaranteed Maximum Price Contracts (GMP) ​ GMP contracts share many of the same contract provisions as cost-plus and fixed-price contracts. As with cost-plus contracts, clients are provided a disclosure of all the project costs, and a lump sum or percentage fee is separately identified. The Company provides clients with a guaranteed price for the overall project (adjusted for change orders issued by clients) and a schedule including the expected completion date. Cost overruns or costs associated with project delays in completion could generally be the Company’s responsibility. For many of the Company’s commercial or residential GMP contracts, the final price is generally not established until the Company has subcontracted a substantial percentage of the trade contracts with terms consistent with the master contract, and it has negotiated additional contractual limitations, such as waivers of consequential damages as well as aggregate caps on liabilities and liquidated damages. Revenue is recognized for GMP contracts as project costs are incurred relative to total estimated project costs. ​ Fixed-Price Contracts ​ Fixed-price contracts include both lump-sum and fixed-unit price contracts. Under lump-sum contracts, the Company performs all the work under the contract for a specified fee. Lump-sum contracts are typically subject to price adjustments if the scope of the project changes or unforeseen conditions arise. Under fixed-unit price contracts, the Company performs a number of units of work at an agreed price per unit with the total payment under the contract determined by the actual number of units delivered. Revenue is recognized for fixed-price contracts using the input method measured on a cost-to-cost basis. ​ The following tables present the Company’s revenues disaggregated by revenue sources: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ March 31, ​ March 31, ​ March 31, ​ March 31, ​ 2022 2021 2022 2021 ​ (in millions) Cost reimbursable ​ $ 1,378.9 ​ $ 1,405.2 ​ $ 2,686.5 ​ $ 2,732.6 Guaranteed maximum price ​ 1,004.9 ​ ​ 1,015.2 ​ ​ 2,072.6 ​ ​ 2,213.1 Fixed-price ​ 829.9 ​ ​ 845.1 ​ ​ 1,721.3 ​ ​ 1,633.0 Total revenue ​ $ 3,213.7 ​ $ 3,265.5 ​ $ 6,480.4 ​ $ 6,578.7 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ March 31, ​ March 31, ​ March 31, ​ March 31, ​ 2022 2021 2022 2021 ​ (in millions) Americas ​ $ 2,400.5 ​ $ 2,469.1 ​ $ 4,864.6 ​ $ 5,026.6 Europe, Middle East, India, Africa ​ 457.6 ​ ​ 435.4 ​ ​ 898.5 ​ ​ 850.2 Asia Pacific ​ 355.6 ​ ​ 361.0 ​ ​ 717.3 ​ ​ 701.9 Total revenue ​ $ 3,213.7 ​ $ 3,265.5 ​ $ 6,480.4 ​ $ 6,578.7 ​ As of March 31, 2022, the Company had allocated $22.3 billion of transaction price to unsatisfied or partially satisfied performance obligations, of which approximately 55% is expected to be satisfied within the next twelve months . ​ Contract liabilities represent amounts billed to clients in excess of revenue recognized to date. The Company recognized revenue of $458.5 million and $584.3 million during the six months ended March 31, 2022 and 2021, respectively, that was included in contract liabilities as of September 30, 2021 and 2020, respectively. ​ The Company’s timing of revenue recognition may not be consistent with its rights to bill and collect cash from its clients. Those rights are generally dependent upon advance billing terms, milestone billings based on the completion of certain phases of work or when services are performed. The Company’s accounts receivables represent amounts billed to clients that have yet to be collected and represent an unconditional right to cash from its clients. Contract assets represent the amount of contract revenue recognized but not yet billed pursuant to contract terms or accounts billed after the balance sheet date. Contract liabilities represent billings as of the balance sheet date, as allowed under the terms of a contract, but not yet recognized as contract revenue pursuant to the Company’s revenue recognition policy. ​ Net accounts receivable consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2022 2021 ​ ​ (in millions) Billed ​ $ 2,053.9 ​ $ 2,181.1 Contract retentions ​ 505.2 ​ ​ 531.2 Total accounts receivable—gross ​ 2,559.1 ​ ​ 2,712.3 Allowance for doubtful accounts and credit losses ​ (109.0) ​ ​ (92.8) Total accounts receivable—net ​ $ 2,450.1 ​ $ 2,619.5 ​ Substantially all contract assets as of March 31, 2022 and September 30, 2021 are expected to be billed and collected within twelve months , except for claims. Significant claims recorded in contract assets and other non-current assets were approximately $140 million as of both March 31, 2022 and September 30, 2021. The asset related to the Deactivation, Demolition, and Removal Project retained from the MS Purchaser as defined in and discussed in Note 15 is presented in prepaid expense and other current assets from continuing operations in the Consolidated Balance Sheet. Contract retentions represent amounts invoiced to clients where payments have been withheld from progress payments until the contracted work has been completed and approved by the client but nonetheless represent an unconditional right to cash. These retention agreements vary from project to project and could be outstanding for several months or years. ​ On October 1, 2020, the Company adopted accounting pronouncements issued by the FASB regarding the changes to the way in which entities estimate credit losses for most financial assets, including accounts receivable and contract assets. The new guidance requires the Company to maintain an allowance for credit losses, which represent the portion of its financial assets that it does not expect to collect over their contractual life. The Company considers a broad range of information to estimate expected credit losses including the related ages of past due balances, projections of credit losses based on historical trends, and collection history and credit quality of its clients. Negative macroeconomic trends or delays in payment of outstanding receivables could result in an increase in the estimated credit losses. ​ No single client accounted for more than 10% of the Company’s outstanding receivables at March 31, 2022 and September 30, 2021. ​ The Company sold trade receivables to financial institutions, of which $223.7 million and $263.6 million were outstanding as of March 31, 2022 and September 30, 2021, respectively. The Company does not retain financial or legal obligations for these receivables that would result in material losses. The Company’s ongoing involvement is limited to the remittance of customer payments to the financial institutions with respect to the sold trade receivables.

Joint Ventures and Variable Int

Joint Ventures and Variable Interest Entities	6 Months Ended
	Mar. 31, 2022
Joint Ventures and Variable Interest Entities
Joint Ventures and Variable Interest Entities	5. Joint Ventures and Variable Interest Entities ​ The Company’s joint ventures provide architecture, engineering, program management, construction management, operations and maintenance services, and invest in real estate projects. Joint ventures, the combination of two or more partners, are generally formed for a specific project. Management of the joint venture is typically controlled by a joint venture executive committee, comprised of representatives from the joint venture partners. The joint venture executive committee normally provides management oversight and controls decisions which could have a significant impact on the joint venture. ​ Some of the Company’s joint ventures have no employees and minimal operating expenses. For these joint ventures, which are referred to as pass-through joint ventures, the Company’s employees perform work for the joint venture, which is then billed to a third-party customer by the joint venture. These joint ventures function as pass-through entities to bill the third-party customer. For consolidated joint ventures of this type, the Company records the entire amount of the services performed and the costs associated with these services, including the services provided by the other joint venture partners, in the Company’s result of operations. For certain of these joint ventures where a fee is added by an unconsolidated joint venture to client billings, the Company’s portion of that fee is recorded in equity in earnings of joint ventures. ​ The Company also has joint ventures that have their own employees and operating expenses, and to which the Company generally makes a capital contribution. The Company accounts for these joint ventures either as consolidated entities or equity method investments based on the criteria further discussed below. ​ The Company follows guidance on the consolidation of variable interest entities (VIEs) that requires companies to utilize a qualitative approach to determine whether it is the primary beneficiary of a VIE. The process for identifying the primary beneficiary of a VIE requires consideration of the factors that indicate a party has the power to direct the activities that most significantly impact the joint venture’s economic performance, including powers granted to the joint venture’s program manager, powers contained in the joint venture governing board and, to a certain extent, a company’s economic interest in the joint venture. The Company analyzes its joint ventures and classifies them as either: ​ ● a VIE that must be consolidated because the Company is the primary beneficiary or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or ​ ● a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest. ​ As part of the above analysis, if it is determined that the Company has the power to direct the activities that most significantly impact the joint venture’s economic performance, the Company considers whether or not it has the obligation to absorb losses or rights to receive benefits of the VIE that could potentially be significant to the VIE. ​ Contractually required support provided to the Company’s joint ventures is further discussed in Note 15. ​ Summary of financial information of the consolidated joint ventures is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ ​ ​ ​ 2022 ​ September 30, ​ ​ (unaudited) ​ 2021 ​ ​ (in millions) Current assets ​ $ 502.0 ​ $ 503.9 Non-current assets ​ 74.5 ​ 74.8 Total assets ​ $ 576.5 ​ $ 578.7 ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ $ 434.3 ​ $ 400.3 Non-current liabilities ​ 1.5 ​ 1.5 Total liabilities ​ 435.8 ​ 401.8 Total AECOM equity ​ 32.4 ​ 74.0 Noncontrolling interests ​ 108.3 ​ 102.9 Total owners’ equity ​ 140.7 ​ 176.9 Total liabilities and owners’ equity ​ $ 576.5 ​ $ 578.7 ​ Total revenue of the consolidated joint ventures was $627.3 million and $379.8 million for the six months ended March 31, 2022 and 2021, respectively. The assets of the Company’s consolidated joint ventures are restricted for use only by the particular joint venture and are not available for the general operations of the Company. ​ Summary of unaudited financial information of the unconsolidated joint ventures, as derived from their unaudited financial statements, is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ 2022 2021 ​ ​ (in millions) Current assets ​ $ 1,291.0 ​ $ 1,323.2 Non-current assets ​ 1,018.0 ​ 1,001.6 Total assets ​ $ 2,309.0 ​ $ 2,324.8 ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ $ 782.0 ​ $ 845.8 Non-current liabilities ​ 529.3 ​ 537.2 Total liabilities ​ 1,311.3 ​ 1,383.0 Joint ventures’ equity ​ 997.7 ​ 941.8 Total liabilities and joint ventures’ equity ​ $ 2,309.0 ​ $ 2,324.8 ​ ​ ​ ​ ​ ​ ​ AECOM’s investment in unconsolidated joint ventures ​ $ 341.5 ​ $ 328.9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ March 31, ​ March 31, ​ 2022 2021 ​ ​ (in millions) Revenue ​ $ 925.1 ​ $ 1,229.4 Cost of revenue ​ 888.1 ​ 1,197.1 Gross profit ​ $ 37.0 ​ $ 32.3 Net income ​ $ 34.0 ​ $ 30.3 ​ Summary of AECOM’s equity in earnings of unconsolidated joint ventures is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ March 31, March 31, ​ 2022 2021 ​ (in millions) Pass-through joint ventures ​ $ 15.7 ​ $ 10.4 Other joint ventures ​ 4.2 ​ ​ 5.0 Total ​ $ 19.9 ​ $ 15.4 ​

Pension Benefit Obligations

Pension Benefit Obligations	6 Months Ended
	Mar. 31, 2022
Pension Benefit Obligations
Pension Benefit Obligations	6. Pension Benefit Obligations ​ In the U.S., the Company sponsors various qualified defined benefit pension plans. Benefits under these plans generally are based on the employee’s years of creditable service and compensation; however, all U.S. defined benefit plans are closed to new participants and have frozen accruals. ​ The Company also sponsors various non-qualified plans in the U.S.; all of these plans are frozen. Outside the U.S., the Company sponsors various pension plans, which are appropriate to the country in which the Company operates, some of which are government mandated. ​ The components of net periodic benefit cost other than the service cost component are included in other income in the consolidated statement of operations. The following table details the components of net periodic benefit cost for the Company’s pension plans for the three and six months ended March 31, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ March 31, 2022 ​ March 31, 2021 ​ March 31, 2022 ​ March 31, 2021 ​ ​ U.S. Int’l U.S. Int’l U.S. Int’l U.S. Int’l ​ ​ (in millions) Components of net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service costs ​ $ — ​ $ 0.1 ​ $ — ​ $ 0.2 ​ $ — ​ $ 0.2 ​ $ — ​ $ 0.3 ​ Interest cost on projected benefit obligation ​ 1.1 ​ ​ 6.3 ​ ​ 1.1 ​ ​ 5.4 ​ 2.3 ​ 12.7 ​ ​ 2.1 ​ ​ 10.7 ​ Expected return on plan assets ​ (1.4) ​ ​ (10.8) ​ ​ (1.6) ​ ​ (11.0) ​ (2.8) ​ (21.8) ​ ​ (3.2) ​ ​ (21.5) ​ Amortization of net loss ​ 1.4 ​ ​ 1.8 ​ ​ 1.5 ​ ​ 2.3 ​ 2.8 ​ 3.7 ​ ​ 3.0 ​ ​ 4.5 ​ Settlement loss recognized ​ ​ 0.2 ​ ​ — ​ ​ — ​ ​ — ​ ​ 0.2 ​ ​ — ​ ​ — ​ ​ — ​ Net periodic benefit cost ​ $ 1.3 ​ $ (2.6) ​ $ 1.0 ​ $ (3.1) ​ $ 2.5 ​ $ (5.2) ​ $ 1.9 ​ $ (6.0) ​ ​ The total amounts of employer contributions paid for the six months ended March 31, 2022 were $4.8 million for U.S. plans and $12.2 million for non-U.S. plans. The expected remaining scheduled annual employer contributions for the fiscal year ending September 30, 2022 are $6.6 million for U.S. plans and $12.8 million for non-U.S. plans.

Debt

Debt	6 Months Ended
	Mar. 31, 2022
Debt
Debt	7. Debt Debt consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ 2022 2021 ​ ​ (in millions) Credit Agreement ​ $ 1,152.2 ​ $ 1,155.3 2027 Senior Notes ​ ​ 997.3 ​ ​ 997.3 Other debt ​ 81.4 ​ ​ 83.0 Total debt ​ 2,230.9 ​ ​ 2,235.6 Less: Current portion of debt and short-term borrowings ​ (42.8) ​ ​ (53.8) Less: Unamortized debt issuance costs ​ ​ (21.8) ​ ​ (24.1) Long-term debt ​ $ 2,166.3 ​ $ 2,157.7 ​ The following table presents, in millions, scheduled maturities of the Company’s debt as of March 31, 2022: ​ ​ ​ ​ ​ Fiscal Year ​ ​ 2022 (six months remaining) ​ $ 22.6 2023 ​ 61.8 2024 ​ 45.1 2025 ​ 39.4 2026 ​ 402.1 Thereafter ​ 1,659.9 Total ​ $ 2,230.9 ​ Credit Agreement ​ On February 8, 2021, the Company entered into the 2021 Refinancing Amendment to the Credit Agreement (the "Credit Agreement"), pursuant to which the Company amended and restated its Syndicated Credit Facility Agreement, dated as of October 17, 2014 (as amended prior to February 8, 2021, the "Original Credit Agreement"), between the Company, as borrower, Bank of America, N.A., as administrative agent, and other parties thereto. The Credit Agreement consists of a $1,150,000,000 revolving credit facility (the "Revolving Credit Facility") and a $246,968,737.50 term loan A facility (the "Term A Facility," together with the Revolving Credit Facility, the "Credit Facilities"), each of which mature on February 8, 2026. The outstanding loans under the Term A Facility were borrowed in U.S. dollars. Loans under the Revolving Credit Facility may be borrowed, and the letters of credit thereunder may be issued, in U.S. dollars or certain foreign currencies. The proceeds of the Revolving Credit Facility may be used from time to time for ongoing working capital and for other general corporate purposes. The proceeds of the Revolving Credit Facility and the Term A Loan facility borrowed on February 8, 2021 were used to refinance the existing revolving credit facility and the existing term loan facility under the Original Credit Agreement and to pay related fees and expenses. The Credit Agreement permits the Company to designate certain of its subsidiaries as additional co-borrowers from time to time. Currently, there are no co-borrowers under the Credit Facilities. ​ The applicable interest rate under the Credit Agreement is calculated at a per annum rate equal to, at the Company’s option, (a) the Eurocurrency Rate (as defined in the Credit Agreement) plus an applicable margin (the “LIBOR Applicable Margin”), which is currently at 1.2250% or (b) the Base Rate (as defined in the Credit Agreement) plus an applicable margin (the “Base Rate Applicable Margin” and together with the LIBOR Applicable Margin, the “Applicable Margins”), which is currently at 0.2250%. The Credit Agreement includes certain environmental, social and governance (ESG) metrics relating to the Company’s CO 2 ​ Some of the Company's material subsidiaries (the "Guarantors") have guaranteed the Company's obligations of the borrowers under the Credit Agreement, subject to certain exceptions. The borrowers' obligations under the Credit Agreement are secured by a lien on substantially all of the Company's assets and its Guarantors' assets, subject to certain exceptions. ​ The Credit Agreement contains customary negative covenants that include, among other things, limitations on the ability of the Company and certain of its subsidiaries, subject to certain exceptions, to incur liens and debt, make investments, dispositions, and restricted payments, change the nature of their business, consummate mergers, consolidations and the sale of all or substantially all of their respective assets, taken as a whole, and transact with affiliates. The Company is also required to maintain a consolidated interest coverage ratio of at least 3.00 to 1.00 and a consolidated leverage ratio of less than or equal to 4.00 to 1.00 (subject to certain adjustments in connection with permitted acquisitions), tested on a quarterly basis (the "Financial Covenants"). The Company's consolidated leverage ratio was 2.30 to 1.00 at March 31, 2022. As of March 31, 2022, the Company was in compliance with the covenants of the Credit Agreement. ​ The Credit Agreement contains customary affirmative covenants, including, among other things, compliance with applicable law, preservation of existence, maintenance of properties and of insurance, and keeping proper books and records. The Credit Agreement contains customary events of default, including, among other things, nonpayment of principal, interest or fees, cross-defaults to other debt, inaccuracies of representations and warranties, failure to perform covenants, events of bankruptcy and insolvency, change of control and unsatisfied judgments, subject in certain cases to notice and cure periods and other exceptions. ​ On April 13, 2021, the Company entered into Amendment No. 10 to the Credit Agreement, pursuant to which the lenders thereunder provided a secured term “B” credit facility (the “Term B Facility”) to the Company in an aggregate principal amount of $700,000,000. The Term B Facility matures on April 13, 2028. The proceeds of the Term B Facility were used to fund the purchase price, fees and expenses in connection with the Company’s cash tender offer to purchase up to $700,000,000 aggregate purchase price (not including any accrued and unpaid interest) of its outstanding 5.875% Senior Notes due 2024. ​ The Term B Facility is subject to the same affirmative and negative covenants and events of default as the Term A Facility previously incurred pursuant to the existing Credit Agreement (except that the Financial Covenants in the Credit Agreement do not apply to the Term B Facility). The applicable interest rate for the Term B Facility is calculated at a per annum rate equal to, at the Company’s option, (a) the Eurocurrency Rate (as defined in the Credit Agreement) plus 1.75% or (b) the Base Rate (as defined in the Credit Agreement) plus 0.75%. ​ On June 25, 2021, the Company entered into Amendment No. 11 to the Credit Agreement, pursuant to which the lenders have provided to the Company an additional $215,000,000 in aggregate principal amount under the Term A Facility. The Company used the net proceeds from the increase in the Term A Facility (together with cash on hand), to (i) redeem all of the Company’s remaining 5.875% Senior Notes due 2024 and (ii) pay fees and expenses related to such redemption. ​ At March 31, 2022 and September 30, 2021, letters of credit totaled $4.5 million and $5.2 million, respectively, under the Company’s Revolving Credit Facility. As of March 31, 2022 and September 30, 2021, the Company had $1,145.5 million and $1,144.8 million, respectively, available under its Revolving Credit Facility. ​ 2027 Senior Notes ​ On February 21, 2017, the Company completed a private placement offering of $1,000,000,000 aggregate principal amount of its unsecured 5.125% Senior Notes due 2027 (the “2027 Senior Notes”). On June 30, 2017, the Company completed an exchange offer to exchange the unregistered 2027 Senior Notes for registered notes, as well as related guarantees. ​ As of March 31, 2022, the estimated fair value of the 2027 Senior Notes was approximately $1,017.2 million. The fair value of the 2027 Senior Notes as of March 31, 2022 was derived by taking the mid-point of the trading prices from an observable market input (Level 2) in the secondary bond market and multiplying it by the outstanding balance of the 2027 Senior Notes. Interest is payable on the 2027 Senior Notes at a rate of 5.125% per annum. Interest on the 2027 Senior Notes is payable semi-annually on March 15 and September 15 of each year, commencing on September 15, 2017. The 2027 Senior Notes will mature on March 15, 2027. ​ At any time and from time to time prior to December 15, 2026, the Company may redeem all or part of the 2027 Senior Notes, at a redemption price equal to 100% of their principal amount, plus a “make whole” premium as of the redemption date, and accrued and unpaid interest to the redemption date. On or after December 15, 2026, the Company may redeem all or part of the 2027 Senior Notes at a redemption price equal to 100% of their principal amount, plus accrued and unpaid interest to the redemption date. ​ The indenture pursuant to which the 2027 Senior Notes were issued contains customary events of default, including, among other things, payment default, exchange default, failure to provide notices thereunder and provisions related to bankruptcy events. The indenture also contains customary negative covenants. ​ The Company was in compliance with the covenants relating to the 2027 Senior Notes as of March 31, 2022. ​ Other Debt ​ Other debt consists primarily of obligations under finance leases and loans and unsecured credit facilities. ​ Effective Interest Rate ​ The Company’s average effective interest rate on its total debt, including the effects of the interest rate swap agreements, during the six months ended March 31, 2022 and 2021 was 3.3% and 5.1%, respectively. ​ Interest expense in the consolidated statements of operations included amortization of deferred debt issuance costs for the three and six months ended March 31, 2022 of $1.2 million and $2.5 million, respectively, and for the three and six months ended March 31, 2021 of $2.6 million and $4.4 million, respectively.

Derivative Financial Instrument

Derivative Financial Instruments and Fair Value Measurements	6 Months Ended
	Mar. 31, 2022
Derivative Financial Instruments and Fair Value Measurements
Derivative Financial Instruments and Fair Value Measurements	8. Derivative Financial Instruments and Fair Value Measurements ​ The Company uses interest rate derivative contracts to hedge interest rate exposures on the Company’s variable rate debt. The Company enters into foreign currency derivative contracts with financial institutions to reduce the risk that its cash flows and earnings will be adversely affected by foreign currency exchange rate fluctuations. The Company’s hedging program is not designated for trading or speculative purposes. ​ The Company recognizes derivative instruments as either assets or liabilities on the accompanying consolidated balance sheets at fair value. The Company records changes in the fair value (i.e., gains or losses) of the derivatives that have been designated as accounting hedges in the accompanying consolidated statements of operations as cost of revenue, interest expense or to accumulated other comprehensive loss in the accompanying consolidated balance sheets. ​ Cash Flow Hedges ​ The Company uses interest rate swap agreements designated as cash flow hedges to fix the variable interest rates on portions of the Company’s debt. The Company initially reports any gain on the effective portion of a cash flow hedge as a component of accumulated other comprehensive loss. Depending on the type of cash flow hedge, the gain is subsequently reclassified against interest expense when the interest expense on the variable rate debt is recognized. If the hedged transaction becomes probable of not occurring, any gain or loss related to interest rate swap agreements would be recognized in other income. ​ The notional principal, fixed rates and related effective and expiration dates of the Company’s outstanding interest rate swap agreements were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2022 Notional Amount ​ Notional Amount ​ Fixed ​ Effective ​ Expiration Currency (in millions) Rate ​ Date Date USD ​ 200.0 2.60% ​ March 2018 ​ February 2023 USD ​ 400.0 ​ 1.349% ​ February 2023 ​ March 2028 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2021 Notional Amount ​ Notional Amount ​ Fixed ​ Effective ​ Expiration Currency (in millions) Rate ​ Date Date USD ​ 200.0 ​ 2.60% ​ March 2018 ​ February 2023 USD ​ 400.0 1.349% ​ February 2023 ​ March 2028 ​ In the fourth quarter of fiscal 2021, the Company entered into new interest rate swap agreements with a notional value of $400.0 million to manage the interest rate exposure of its variable rate loans. The new swaps will become effective February 2023 and terminate in March 2028. By entering into the swap agreements, the Company converted a portion of the LIBOR rate-based liability into a fixed rate liability. The Company will pay a fixed rate of 1.349% and receive payment at the prevailing one-month LIBOR. ​ Other Foreign Currency Forward Contracts ​ The Company uses foreign currency forward contracts which are not designated as accounting hedges to hedge intercompany transactions and other monetary assets or liabilities denominated in currencies other than the functional currency of a subsidiary. Gains and losses on these contracts were not material for the six months ended March 31, 2022 and 2021. ​ Fair Value Measurements ​ The Company’s non-pension financial assets and liabilities recorded at fair value relate to the interest rate swap agreements included in other current assets, other non-current assets, and other current liabilities on March 31, 2022 and were $0.7 million, $23.9 million, and $1.5 million, respectively. The fair values of the interest rate swap agreements included in other non-current assets, other current liabilities, and other long-term liabilities on September 30, 2021 were $1.2 million, $5.0 million, and $1.8 million, respectively. The fair values of the interest rate swap agreements were derived by taking the net present value of the expected cash flows using observable market inputs (Level 2) such as LIBOR or SOFR rate curves, futures, volatilities and basis spreads (when applicable). ​ See Note 14 for accumulated balances and reporting period activities of derivatives related to reclassifications out of accumulated other comprehensive loss for the six months ended March 31, 2022 and 2021. Additionally, there were no material losses recognized in income due to amounts excluded from effectiveness testing from the Company’s interest rate swap agreements.

Share-based Payments

Share-based Payments	6 Months Ended
	Mar. 31, 2022
Share-based Payments
Share-based Payments	9. Share-based Payments ​ The fair value of the Company’s employee stock option awards is estimated on the date of grant. The expected term of awards granted represents the period of time the awards are expected to be outstanding. The risk-free interest rate is based on U.S. Treasury bond rates with maturities equal to the expected term of the stock option on the grant date. The Company uses historical data as a basis to estimate the probability of forfeitures. ​ Stock option activity for the six months ended March 31 was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ 2021 ​ ​ Shares of stock ​ Weighted average ​ Shares of stock ​ Weighted average ​ under options exercise price under options exercise price ​ ​ (in millions) ​ ​ ​ ​ (in millions) ​ ​ ​ Outstanding at September 30 ​ 0.3 ​ $ 38.72 ​ 0.4 ​ $ 36.41 Options granted ​ — ​ ​ — ​ — ​ ​ — Options exercised ​ — ​ ​ — ​ (0.1) ​ ​ 31.62 Options forfeited or expired ​ — ​ ​ — ​ — ​ ​ — Outstanding at March 31 ​ 0.3 ​ ​ 38.72 ​ 0.3 ​ ​ 38.72 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Vested and expected to vest in the future as of March 31 ​ 0.2 ​ $ 38.72 ​ 0.2 ​ $ 38.72 ​ The Company grants stock units to employees under its Performance Earnings Program (PEP), whereby units are earned and issued dependent upon meeting established cumulative performance objectives and vest over a three-year service period. Additionally, the Company issues restricted stock units to employees which are earned based on service conditions. The grant date fair value of PEP awards and restricted stock unit awards is that day’s closing market price of the Company’s common stock. The weighted average grant date fair value of PEP awards was $85.48 and $52.52 during the six months ended March 31, 2022 and 2021, respectively. The weighted average grant date fair value of restricted stock unit awards was $74.32 and $48.78 during the six months ended March 31, 2022 and 2021, respectively. Total compensation expense related to these share-based payments including stock options was

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2022
Income Taxes
Income Taxes	10. Income Taxes ​ The Company’s effective tax rate was 24.8% and 25.0% for the six months ended March 31, 2022 and 2021, respectively. The most significant items contributing to the difference between the statutory U.S. federal corporate tax rate of 21.0% and the Company’s effective tax rate for the six-month period ended March 31, 2022 were a tax benefit of $26.5 million related to income tax credits and incentives, tax expense of $19.5 million related to foreign residual income, a tax benefit of $13.9 million related to changes in valuation allowances, tax expense of $14.9 million primarily related to changes in foreign uncertain tax positions, and tax expense of $11.1 million related to state income taxes. All of these items are expected to have a continuing impact on the effective tax rate for the remainder of the fiscal year except for the changes in valuation allowance and uncertain tax positions. ​ The most significant items contributing to the difference between the statutory U.S. federal corporate tax rate of 21.0% and the Company’s effective tax rate for the six-month period ended March 31, 2021 were a tax benefit of $28.4 million related to income tax credits and incentives, tax expense of $20.7 million related to foreign residual income, tax expense of $10.7 million related to state income taxes, and tax expense of $3.2 million related to nondeductible costs. ​ During the six-month period ended March 31, 2022, valuation allowances in the amount of $21.9 million primarily related to net operating losses in certain foreign entities were released due to sufficient positive evidence obtained during the first quarter. The positive evidence included a realignment of the Company’s global transfer pricing methodology that was implemented during the first quarter which resulted in forecasting the utilization of the net operating losses within the foreseeable future. ​ During the six-month period ended March 31, 2022, valuation allowances in the amount of $6.4 million on the net deferred tax assets of the Company’s Russia business were recorded due to the Company exiting all business operations in Russia. It is now more likely than not the net deferred tax assets will not be realized. ​ The Company is utilizing the annual effective tax rate method under ASC 740 to compute its interim tax provision. The Company’s effective tax rate fluctuates from quarter to quarter due to various factors including the change in the mix of global income and expenses, outcomes of administrative audits, changes in the assessment of valuation allowances due to management’s consideration of new positive or negative evidence during the quarter, and changes in enacted tax laws. The U.S.and many international legislative and regulatory bodies have proposed legislation that could significantly impact how our business activities are taxed. These proposed changes could have a material impact on the Company’s income tax expense and deferred tax balances. ​ The Company is currently under tax audit in several jurisdictions including the U.S. and believes the outcomes which are reasonably possible within the next twelve months, including lapses in statutes of limitations, could result in future adjustments, but will not result in a material change in the liability for uncertain tax positions. ​ Generally, the Company does not provide for U.S. taxes or foreign withholding taxes on gross book-tax differences in its non-U.S. subsidiaries because such basis differences of approximately $1.5 billion are able to and intended to be reinvested indefinitely. If these basis differences were distributed, foreign tax credits could become available under current law to partially or fully reduce the resulting U.S. income tax liability. There may also be additional U.S. or foreign income tax liability upon repatriation, although the calculation of such additional taxes is not practicable.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Mar. 31, 2022
Earnings Per Share
Earnings Per Share	11. Earnings Per Share ​ Basic earnings per share (EPS) excludes dilution and is computed by dividing net income attributable to AECOM by the weighted average number of common shares outstanding for the period. Diluted EPS is computed by dividing net income attributable to AECOM by the weighted average number of common shares outstanding and potential common shares for the period. The Company includes as potential common shares the weighted average dilutive effects of equity awards using the treasury stock method. For the three and six months ended March 31, 2022 and 2021, equity awards excluded from the calculation of potential common shares were not significant. ​ The following table sets forth a reconciliation of the denominators for basic and diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ March 31, ​ March 31, March 31, March 31, ​ 2022 2021 2022 2021 ​ ​ (in millions) Denominator for basic earnings per share ​ 141.1 ​ 147.8 ​ 141.4 ​ 149.6 Potential common shares ​ 1.5 ​ 1.7 ​ 2.2 ​ 2.0 Denominator for diluted earnings per share ​ 142.6 ​ 149.5 ​ 143.6 ​ 151.6 ​

Leases

Leases	6 Months Ended
	Mar. 31, 2022
Leases
Leases	12. Leases ​ The Company and its subsidiaries are lessees in non-cancelable leasing agreements for office buildings and equipment. Substantially all of the Company’s office building leases are operating leases, and its equipment leases are both operating and finance leases. The Company groups lease and non-lease components for its equipment leases into a single lease component but separates lease and non-lease components for its office building leases. ​ The Company recognizes a right-of-use asset and lease liability for its operating leases at the commencement date equal to the present value of the contractual minimum lease payments over the lease term. The present value is calculated using the rate implicit in the lease, if known, or the Company’s incremental secured borrowing rate. The discount rate used for operating leases is primarily determined based on an analysis of the Company’s incremental secured borrowing rate, while the discount rate used for finance leases is primarily determined by the rate specified in the lease. ​ The related lease payments are expensed on a straight-line basis over the lease term, including, as applicable, any free-rent period during which the Company has the right to use the asset. For leases with renewal options where the renewal is reasonably assured, the lease term, including the renewal period, is used to determine the appropriate lease classification and to compute periodic rental expense. Leases with initial terms shorter than 12 months are not recognized on the balance sheet, and lease expense is recognized on a straight-line basis. ​ The components of lease expenses are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ March 31, 2022 March 31, 2021 March 31, 2022 March 31, 2021 ​ ​ (in millions) Operating lease cost ​ $ 43.7 ​ $ 47.2 ​ $ 87.8 ​ $ 94.7 Finance lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization of right-of-use assets ​ 4.6 ​ ​ 3.9 ​ ​ 8.7 ​ ​ 6.4 Interest on lease liabilities ​ 0.6 ​ ​ 0.4 ​ ​ 1.1 ​ ​ 1.2 Variable lease cost ​ 8.3 ​ ​ 9.5 ​ ​ 16.4 ​ ​ 18.7 Total lease cost ​ $ 57.2 ​ $ 61.0 ​ $ 114.0 ​ $ 121.0 ​ Additional balance sheet information related to leases is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of (in millions except as noted) Balance Sheet Classification March 31, 2022 September 30, 2021 Assets: ​ ​ ​ ​ Operating lease assets Operating lease right-of-use assets ​ $ 570.6 ​ $ 607.1 Finance lease assets Property and equipment – net ​ ​ 53.6 ​ ​ 44.4 Total lease assets ​ $ 624.2 ​ $ 651.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ Current: ​ ​ ​ ​ ​ ​ Operating lease liabilities Accrued expenses and other current liabilities ​ $ 154.0 ​ $ 157.3 Finance lease liabilities Current portion of long-term debt ​ ​ 17.9 ​ ​ 13.4 Total current lease liabilities ​ ​ 171.9 ​ ​ 170.7 Non-current: ​ ​ ​ ​ ​ ​ Operating lease liabilities Operating lease liabilities, noncurrent ​ ​ 636.2 ​ ​ 679.1 Finance lease liabilities Long-term debt ​ ​ 37.1 ​ ​ 32.1 Total non-current lease liabilities ​ $ 673.3 ​ $ 711.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ ​ March 31, 2022 September 30, 2021 ​ Weighted average remaining lease term (in years): ​ ​ ​ Operating leases 6.6 ​ 6.9 ​ Finance leases 3.4 ​ 3.5 ​ Weighted average discount rates: ​ ​ ​ ​ Operating leases 4.1 % 4.3 % Finance leases 3.9 % 4.3 % ​ Additional cash flow information related to leases is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ March 31, ​ March 31, ​ 2022 2021 ​ ​ (in millions) Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ ​ Operating cash flows from operating leases ​ $ 102.7 ​ $ 113.0 Operating cash flows from finance leases ​ ​ 1.1 ​ ​ 0.9 Financing cash flows from finance leases ​ ​ 9.7 ​ ​ 6.0 Right-of-use assets obtained in exchange for new operating leases ​ ​ 31.9 ​ ​ 67.4 Right-of-use assets obtained in exchange for new finance leases ​ ​ 18.4 ​ ​ 13.4 ​ Total remaining lease payments under both the Company’s operating and finance leases are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases Finance Leases Fiscal Year ​ (in millions) 2022 (six months remaining) ​ $ 95.9 ​ $ 9.6 2023 ​ 166.4 ​ ​ 19.6 2024 ​ 142.4 ​ ​ 15.9 2025 ​ 119.1 ​ ​ 9.9 2026 ​ ​ 94.6 ​ ​ 3.3 Thereafter ​ 288.0 ​ ​ 0.4 Total lease payments ​ $ 906.4 ​ $ 58.7 Less: Amounts representing interest ​ $ (116.2) ​ $ (3.7) Total lease liabilities ​ $ 790.2 ​ $ 55.0 ​

Other Financial Information

Other Financial Information	6 Months Ended
	Mar. 31, 2022
Other Financial Information
Other Financial Information	13. Other Financial Information ​ Accrued expenses and other current liabilities consist of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, September 30, ​ ​ 2022 ​ 2021 ​ ​ (in millions) Accrued salaries and benefits ​ $ 639.2 ​ $ 661.8 Accrued contract costs ​ 1,228.5 ​ ​ 1,202.1 Other accrued expenses ​ 351.3 ​ ​ 310.3 ​ ​ $ 2,219.0 ​ $ 2,174.2 ​ Accrued contract costs above include balances related to professional liability accruals of $742.3 million and $736.4 million as of March 31, 2022 and September 30, 2021, respectively. The remaining accrued contract costs primarily relate to costs for services provided by subcontractors and other non-employees for which the Company has not received an invoice. Liabilities recorded related to accrued contract losses were not material as of March 31, 2022 and September 30, 2021. The Company did not have material revisions to estimates for contracts where revenue is recognized using the input method during the six months ended March 31, 2022 and 2021. During the first half of fiscal 2022, the Company incurred restructuring expenses of $76.7 million, of which $69.1 million was related to the exit of our Russia-related businesses and is discussed further below. The remaining $7.6 million related to actions to improve margins and deliver efficiencies. These expenses included personnel and other costs of $5.4 million and real estate costs of $2.2 million, of which $0.6 million was accrued and unpaid at March 31, 2022. During the first half of fiscal 2021, the Company incurred restructuring expenses of $21.8 million, including personnel and other costs of $16.8 million and real estate costs of $5.0 million, of which $3.7 million was accrued and unpaid at March 31, 2021. ​ In March 2022, the Company substantially completed the previously announced exit of all business operations in Russia. The Company incurred a $69.1 million pre-tax expense during the three-month period ended March 31, 2022 related to the exit of its Russia-related businesses, which comprised of asset impairment charges, personnel and real estate costs, of which $5.8 million was accrued and unpaid at March 31, 2022. Approximately $19.5 million of that expense was due to the recognition in earnings of the Company’s cumulative translation adjustment related to the Russian ruble, which was previously reported as a component of Stockholders’ Equity. The financial contribution to the Company from its business related to Russia was not material. On March 3, 2022, the Company's Board of Directors declared a quarterly cash dividend of $0.15 per share, which was paid on April 21, 2022 to stockholders of record as of April 6, 2022. As of March 31, 2022, accrued and unpaid dividends totaled $21.8 million and were classified within other accrued expenses on the consolidated balance sheet.

Reclassifications out of Accumu

Reclassifications out of Accumulated Other Comprehensive Loss	6 Months Ended
	Mar. 31, 2022
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications out of Accumulated Other Comprehensive Loss	14. Reclassifications out of Accumulated Other Comprehensive Loss ​ The accumulated balances and reporting period activities for the three and six months ended March 31, 2022 and 2021 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ ​ Related ​ Translation ​ Derivative ​ Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at December 31, 2021 ​ $ (313.4) ​ $ (585.3) ​ $ (0.5) ​ $ (899.2) Other comprehensive income (loss) before reclassification ​ ​ 6.5 ​ ​ (10.4) ​ ​ 16.1 ​ ​ 12.2 Amounts reclassified from accumulated other comprehensive loss ​ ​ 2.5 ​ ​ 19.5 ​ ​ 0.9 ​ ​ 22.9 Balances at March 31, 2022 ​ $ (304.4) ​ $ (576.2) ​ $ 16.5 ​ $ (864.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ ​ Related ​ Translation ​ Derivative ​ Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at December 31, 2020 ​ $ (353.5) ​ $ (515.6) ​ $ (7.7) ​ $ (876.8) Other comprehensive (loss) income before reclassification ​ (3.0) ​ ​ (20.0) ​ ​ 0.2 ​ ​ (22.8) Amounts reclassified from accumulated other comprehensive loss ​ ​ 3.0 ​ ​ — ​ ​ 0.9 ​ ​ 3.9 Balances at March 31, 2021 ​ $ (353.5) ​ $ (535.6) ​ $ (6.6) ​ $ (895.7) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ Related Translation Derivative Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at September 30, 2021 ​ $ (316.2) ​ $ (580.1) ​ $ (4.1) ​ $ (900.4) Other comprehensive (loss) income before reclassification ​ 6.8 ​ ​ (15.6) ​ ​ 18.8 ​ ​ 10.0 Amounts reclassified from accumulated other comprehensive loss ​ 5.0 ​ ​ 19.5 ​ ​ 1.8 ​ ​ 26.3 Balances at March 31, 2022 ​ $ (304.4) ​ $ (576.2) ​ $ 16.5 ​ $ (864.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ ​ Related ​ Translation ​ Derivative ​ Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at September 30, 2020 ​ $ (342.8) ​ $ (567.3) ​ $ (8.6) ​ $ (918.7) Other comprehensive (loss) income before reclassification ​ (16.7) ​ ​ 31.7 ​ ​ 0.2 ​ ​ 15.2 Amounts reclassified from accumulated other comprehensive loss ​ 6.0 ​ ​ — ​ ​ 1.8 ​ ​ 7.8 Balances at March 31, 2021 ​ $ (353.5) ​ $ (535.6) ​ $ (6.6) ​ $ (895.7) ​

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2022
Commitments and Contingencies
Commitments and Contingencies	15. Commitments and Contingencies ​ The Company records amounts representing its probable estimated liabilities relating to claims, guarantees, litigation, audits and investigations. The Company relies in part on qualified actuaries to assist it in determining the level of reserves to establish for insurance-related claims that are known and have been asserted against it, and for insurance-related claims that are believed to have been incurred based on actuarial analysis, but have not yet been reported to the Company’s claims administrators as of the respective balance sheet dates. The Company includes any adjustments to such insurance reserves in its consolidated results of operations. The Company’s reasonably possible loss disclosures are presented on a gross basis prior to the consideration of insurance recoveries. The Company does not record gain contingencies until they are realized. In the ordinary course of business, the Company may not be aware that it or its affiliates are under investigation and may not be aware of whether or not a known investigation has been concluded. ​ In the ordinary course of business, the Company may enter into various arrangements providing financial or performance assurance to clients, lenders, or partners. Such arrangements include standby letters of credit, surety bonds, and corporate guarantees to support the creditworthiness or the project execution commitments of its affiliates, partnerships and joint ventures. The Company's unsecured credit arrangements are used for standby letters of credit issued in connection with general and professional liability insurance programs and for contract performance guarantees. At March 31, 2022 and September 30, 2021, these outstanding standby letters of credit totaled $487.5 million and $478.5 million, respectively. As of March 31, 2022, the Company had $432.3 million available under these unsecured credit facilities. Performance arrangements typically have various expiration dates ranging from the completion of the project contract and extending beyond contract completion in some circumstances such as for warranties. The Company may also guarantee that a project, when complete, will achieve specified performance standards. If the project subsequently fails to meet guaranteed performance standards, the Company may incur additional costs, pay liquidated damages or be held responsible for the costs incurred by the client to achieve the required performance standards. The potential payment amount of an outstanding performance arrangement is typically the remaining cost of work to be performed by or on behalf of third parties. Generally, under joint venture arrangements, if a partner is financially unable to complete its share of the contract, the other partner(s) may be required to complete those activities. ​ At March 31, 2022, the Company was contingently liable in the amount of approximately $492.0 million in issued standby letters of credit and $3.4 billion in issued surety bonds primarily to support project execution. ​ In the ordinary course of business, the Company enters into various agreements providing financial or performance assurances to clients on behalf of certain unconsolidated partnerships, joint ventures and other jointly executed contracts. These agreements are entered into primarily to support the project execution commitments of these entities. ​ The Company’s investment adviser jointly manages and sponsors the AECOM-Canyon Equity Fund, L.P. (the “Fund”), in which the Company indirectly holds an equity interest and has an ongoing capital commitment to fund investments. At March 31, 2022, the Company has capital commitments of $19.1 million to the Fund over the next 7 years . ​ In addition, in connection with the investment activities of AECOM Capital, the Company provides guarantees of certain contractual obligations, including guarantees for completion of projects, repayment of debt, environmental indemnity obligations and other lender required guarantees. ​ Department of Energy Deactivation, Demolition, and Removal Project ​ A former affiliate of the Company, Amentum Environment & Energy, Inc., f/k/a AECOM Energy and Construction, Inc. (“Former Affiliate”), executed a cost-reimbursable task order with the Department of Energy (DOE) in 2007 to provide deactivation, demolition and removal services at a New York State project site that, during 2010, experienced contamination and performance issues. In February 2011, the Former Affiliate and the DOE executed a Task Order Modification that changed some cost-reimbursable contract provisions to at-risk. The Task Order Modification, including subsequent amendments, required the DOE to pay all project costs up to $106 million, required the Former Affiliate and the DOE to equally share in all project costs incurred from $106 million to $146 million, and required the Former Affiliate to pay all project costs exceeding $146 million. ​ Due to unanticipated requirements and permitting delays by federal and state agencies, as well as delays and related ground stabilization activities caused by Hurricane Irene in 2011, the Former Affiliate was required to perform work outside the scope of the Task Order Modification. In December 2014, the Former Affiliate submitted an initial set of claims against the DOE pursuant to the Contracts Disputes Acts seeking recovery of $103 million, including additional fees on changed work scope (the “2014 Claims”). On December 6, 2019, the Former Affiliate submitted a second set of claims against the DOE seeking recovery of an additional $60.4 million, including additional project costs and delays outside the scope of the contract as a result of differing site and ground conditions (the “2019 Claims”). The Former Affiliate also submitted three alternative breach of contract claims to the 2014 and 2019 Claims that may entitle the Former Affiliate to recovery of $148.5 million to $329.4 million. On December 30, 2019, the DOE denied the Former Affiliate’s 2014 Claims. On September 25, 2020, the DOE denied the Former Affiliate’s 2019 Claims. The Company filed an appeal of these decisions on December 20, 2020 in the Court of Federal Claims. Deconstruction, decommissioning and site restoration activities are complete. ​ On January 31, 2020, the Company completed the sale of its Management Services business, including the Former Affiliate who worked on the DOE project, to Maverick Purchaser Sub LLC (MS Purchaser), an affiliate of American Securities LLC and Lindsay Goldberg LLC. The Company and the MS Purchaser agreed that all future DOE project claim recoveries and costs will be split 10% to the MS Purchaser and 90% to the Company with the Company retaining control of all future strategic legal decisions. ​ The Company intends to vigorously pursue all claimed amounts but can provide no certainty that the Company will recover 2014 Claims and 2019 Claims submitted against the DOE, or any additional incurred claims or costs, which could have a material adverse effect on the Company’s results of operations. ​ New York Department of Environmental Conservation ​ In September 2017, AECOM USA, Inc. was advised by the New York State Department of Environmental Conservation (DEC) of allegations that it committed environmental permit violations pursuant to the New York Environmental Conservation Law (ECL) associated with AECOM USA, Inc.’s oversight of a stream restoration project for Schoharie County which could result in substantial penalties if calculated under the ECL’s maximum civil penalty provisions. AECOM USA, Inc. disputes this claim and intends to continue to defend this matter vigorously; however, AECOM USA, Inc. cannot provide assurances that it will be successful in these efforts. The potential range of loss in excess of any current accrual cannot be reasonably estimated at this time primarily because the matter involves complex and unique environmental and regulatory issues; the project site involves the oversight and involvement of various local, state and federal government agencies; there is substantial uncertainty regarding any alleged damages; and the matter is in its preliminary stages. ​ Refinery Turnaround Project ​ A Former Affiliate of the Company entered into an agreement to perform turnaround maintenance services during a planned shutdown at a refinery in Montana in December 2017. The turnaround project was completed in February 2019. Due to circumstances outside of the Company’s Former Affiliate’s control, including client directed changes and delays and the refinery’s condition, the Company’s Former Affiliate performed additional work outside of the original contract over $90 million and is entitled to payment from the refinery owner of approximately $144 million. In March 2019, the refinery owner sent a letter to the Company’s Former Affiliate alleging it incurred approximately $79 million in damages due to the Company’s Former Affiliate’s project performance. In April 2019, the Company’s Former Affiliate filed and perfected a $132 million construction lien against the refinery for unpaid labor and materials costs. In August 2019, following a subcontractor complaint filed in the Thirteen Judicial District Court of Montana asserting claims against the refinery owner and the Company’s Former Affiliate, the refinery owner crossclaimed against the Company’s Former Affiliate and the subcontractor. In October 2019, following the subcontractor’s dismissal of its claims, the Company’s Former Affiliate removed the matter to federal court and cross claimed against the refinery owner. In December 2019, the refinery owner claimed $93.0 million in damages and offsets against the Company’s Former Affiliate. ​ On January 31, 2020, the Company completed the sale of its Management Services business, including the Former Affiliate, to the MS Purchaser; however, the Refinery Turnaround Project, including related claims and liabilities, has been retained by the Company. ​ The Company intends to vigorously prosecute and defend this matter; however, the Company cannot provide assurance that the Company will be successful in these efforts. The resolution of this matter and any potential range of loss cannot be reasonably determined or estimated at this time, primarily because the matter raises complex legal issues that Company is continuing to assess.

Reportable Segments

Reportable Segments	6 Months Ended
	Mar. 31, 2022
Reportable Segments
Reportable Segments	16. Reportable Segments ​ The Company's reportable segments are presented according to their geographic regions and business activities. The Americas segment provides planning, consulting, architectural and engineering design services, and construction management services to commercial and government clients in the United States, Canada, and Latin America, while the International segment provides similar professional services to commercial and government clients in Europe, the Middle East, India, Africa, and the Asia-Pacific regions. ​ The Company’s AECOM Capital (ACAP) segment primarily invests in and develops real estate projects. These reportable segments are organized by the differing specialized needs of the respective clients, and how the Company manages its business. The Company has aggregated various operating segments into its reportable segments based on their similar characteristics, including similar long term financial performance, the nature of services provided, internal processes for delivering those services, and types of customers. ​ The following tables set forth summarized financial information concerning the Company’s reportable segments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ AECOM ​ ​ ​ ​ ​ ​ ​ Reportable Segments: Americas International Capital Corporate Total ​ ​ ​ ($ in millions) Three Months Ended March 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 2,399.9 ​ $ 813.3 ​ $ 0.5 ​ $ — ​ $ 3,213.7 ​ Gross profit ​ 160.4 ​ 49.1 ​ 0.5 ​ ​ — ​ ​ 210.0 ​ Equity in earnings of joint ventures ​ 3.2 ​ 5.7 ​ 3.1 ​ ​ — ​ ​ 12.0 ​ General and administrative expenses ​ — ​ — ​ (2.6) ​ ​ (34.6) ​ ​ (37.2) ​ Restructuring costs ​ ​ — ​ ​ — ​ ​ — ​ ​ (73.3) ​ ​ (73.3) ​ Operating income ​ 163.6 ​ 54.8 ​ 1.0 ​ ​ (107.9) ​ ​ 111.5 ​ Gross profit as a % of revenue ​ 6.7 % 6.0 % — ​ ​ — ​ ​ 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 2,468.3 ​ $ 796.5 ​ $ 0.7 ​ $ — ​ $ 3,265.5 ​ Gross profit ​ 151.7 ​ 42.8 ​ ​ 0.7 ​ — ​ 195.2 ​ Equity in earnings of joint ventures ​ 3.0 ​ 3.0 ​ ​ 1.2 ​ — ​ 7.2 ​ General and administrative expenses ​ — ​ — ​ ​ (1.5) ​ (34.5) ​ (36.0) ​ Restructuring costs ​ ​ — ​ ​ — ​ ​ — ​ ​ (8.8) ​ ​ (8.8) ​ Operating income ​ ​ 154.7 ​ ​ 45.8 ​ ​ 0.4 ​ ​ (43.3) ​ ​ 157.6 ​ Gross profit as a % of revenue ​ 6.1 % ​ 5.4 % ​ — ​ ​ — ​ ​ 6.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 4,863.4 ​ $ 1,615.7 ​ $ 1.3 ​ $ — ​ $ 6,480.4 ​ Gross profit ​ ​ 310.4 ​ ​ 98.5 ​ ​ 1.3 ​ ​ — ​ ​ 410.2 ​ Equity in earnings of joint ventures ​ ​ 6.4 ​ ​ 9.3 ​ ​ 4.2 ​ ​ — ​ ​ 19.9 ​ General and administrative expenses ​ ​ — ​ ​ — ​ ​ (5.6) ​ ​ (68.0) ​ ​ (73.6) ​ Restructuring costs ​ ​ — ​ ​ — ​ ​ — ​ ​ (76.7) ​ ​ (76.7) ​ Operating income (loss) ​ ​ 316.8 ​ ​ 107.8 ​ ​ (0.1) ​ ​ (144.7) ​ ​ 279.8 ​ Gross profit as a % of revenue ​ ​ 6.4 % ​ 6.1 % ​ — ​ ​ — ​ ​ 6.3 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 5,025.6 ​ $ 1,552.1 ​ $ 1.0 ​ $ — ​ $ 6,578.7 ​ Gross profit ​ 296.7 ​ 81.9 ​ ​ 1.0 ​ — ​ 379.6 ​ Equity in earnings of joint ventures ​ 4.4 ​ 6.0 ​ ​ 5.0 ​ — ​ 15.4 ​ General and administrative expenses ​ — ​ — ​ ​ (3.4) ​ (71.0) ​ (74.4) ​ Restructuring costs ​ — ​ — ​ ​ — ​ (21.8) ​ (21.8) ​ Operating income ​ 301.1 ​ 87.9 ​ ​ 2.6 ​ (92.8) ​ 298.8 ​ Gross profit as a % of revenue ​ 5.9 % 5.3 % ​ — ​ ​ — ​ 5.8 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reportable Segments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2022 ​ $ 7,134.9 ​ $ 2,593.1 ​ $ 236.6 ​ $ 1,147.1 ​ ​ ​ September 30, 2021 ​ $ 7,204.6 ​ $ 2,764.5 ​ $ 234.6 ​ $ 1,390.9 ​ ​ ​ ​

Discontinued Operations, Good_2

Discontinued Operations, Goodwill and Intangible Assets (Tables)	6 Months Ended
	Mar. 31, 2022
Discontinued Operations, Goodwill and Intangible Assets.
Summarized results of the discontinued operation, included in the Company's results of operations	The following table represents summarized balance sheet information of assets and liabilities held for sale (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ 2022 2021 ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 2.1 ​ $ 5.6 Receivables and contract assets ​ 43.6 ​ ​ 90.3 Other ​ 32.0 ​ ​ 43.5 Current assets held for sale ​ $ 77.7 ​ $ 139.4 ​ ​ ​ ​ ​ ​ ​ Property and equipment, net ​ $ 6.8 ​ $ 52.9 Other ​ — ​ ​ 18.5 Write-down of assets to fair value less cost to sell ​ ​ — ​ ​ (71.4) Non-current assets held for sale ​ $ 6.8 ​ $ — ​ ​ ​ ​ ​ ​ ​ Accounts payable and accrued expenses ​ $ 47.9 ​ $ 88.5 Other ​ — ​ ​ 5.5 Current liabilities held for sale ​ $ 47.9 ​ $ 94.0 ​ ​ ​ ​ ​ ​ ​ Long-term liabilities held for sale ​ $ 0.3 ​ $ 11.1 ​ The following table represents summarized income statement information of discontinued operations (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended Six months ended ​ ​ March 31, ​ March 31, March 31, ​ March 31, ​ 2022 2021 2022 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 84.7 ​ $ 113.0 ​ $ 211.8 ​ $ 443.7 Cost of revenue ​ 84.3 ​ ​ 117.9 ​ ​ 229.6 ​ ​ 440.8 Gross profit (loss) ​ 0.4 ​ ​ (4.9) ​ ​ (17.8) ​ ​ 2.9 Equity in earnings of joint ventures ​ — ​ ​ 0.3 ​ ​ (3.4) ​ ​ 8.0 Loss on disposal activities ​ ​ (3.4) ​ ​ (38.8) ​ ​ (45.5) ​ ​ (50.1) Transaction costs ​ ​ (3.9) ​ ​ (2.7) ​ ​ (6.2) ​ ​ (13.6) Impairment of long-lived assets ​ ​ — ​ ​ — ​ ​ — ​ ​ (95.8) Loss from operations ​ (6.9) ​ ​ (46.1) ​ ​ (72.9) ​ ​ (148.6) Interest expense ​ — ​ ​ (0.1) ​ ​ (0.1) ​ ​ (0.3) Loss before taxes ​ (6.9) ​ ​ (46.2) ​ ​ (73.0) ​ ​ (148.9) Income tax (benefit) expense ​ (0.9) ​ ​ 1.7 ​ ​ (5.0) ​ ​ (45.2) Net loss from discontinuing operations ​ $ (6.0) ​ $ (47.9) ​ $ (68.0) ​ $ (103.7) ​ The significant components included in our Consolidated Statement of Cash Flows for the discontinued operations are as follows (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended Six months ended ​ ​ March 31, March 31, ​ March 31, March 31, ​ 2022 ​ 2021 2022 ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Payments for capital expenditures ​ $ (0.6) ​ $ (1.6) ​ $ (1.5) ​ $ (4.6) ​
Schedule of changes in the carrying value of goodwill by reportable segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ ​ September 30, ​ Exchange ​ March 31, ​ 2021 Impact 2022 ​ ​ (in millions) Americas ​ $ 2,626.4 ​ $ 2.2 ​ $ 2,628.6 International ​ 876.1 ​ ​ (14.2) ​ ​ 861.9 Total ​ $ 3,502.5 ​ $ (12.0) ​ $ 3,490.5
Schedule of finite-lived intangible assets by major class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2022 ​ September 30, 2021 ​ ​ ​ ​ Gross ​ Accumulated ​ Intangible ​ Gross ​ Accumulated ​ Intangible ​ Amortization ​ Amount Amortization Assets, Net Amount Amortization Assets, Net Period ​ ​ (in millions) ​ (years) Backlog and customer relationships ​ $ 663.5 ​ $ (618.0) ​ $ 45.5 ​ $ 663.4 ​ $ (608.5) ​ $ 54.9 ​ 1 - 11
Schedule of estimated future amortization expense of intangible assets	​ ​ ​ ​ ​ Fiscal Year (in millions) 2022 (six months remaining) ​ $ 9.2 2023 ​ 18.2 2024 ​ 17.4 2025 ​ 0.7 Total ​ $ 45.5

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 31, 2022
Revenue Recognition
Schedule of revenues disaggregated by revenue sources	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ March 31, ​ March 31, ​ March 31, ​ March 31, ​ 2022 2021 2022 2021 ​ (in millions) Cost reimbursable ​ $ 1,378.9 ​ $ 1,405.2 ​ $ 2,686.5 ​ $ 2,732.6 Guaranteed maximum price ​ 1,004.9 ​ ​ 1,015.2 ​ ​ 2,072.6 ​ ​ 2,213.1 Fixed-price ​ 829.9 ​ ​ 845.1 ​ ​ 1,721.3 ​ ​ 1,633.0 Total revenue ​ $ 3,213.7 ​ $ 3,265.5 ​ $ 6,480.4 ​ $ 6,578.7 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended ​ Six months ended ​ ​ March 31, ​ March 31, ​ March 31, ​ March 31, ​ 2022 2021 2022 2021 ​ (in millions) Americas ​ $ 2,400.5 ​ $ 2,469.1 ​ $ 4,864.6 ​ $ 5,026.6 Europe, Middle East, India, Africa ​ 457.6 ​ ​ 435.4 ​ ​ 898.5 ​ ​ 850.2 Asia Pacific ​ 355.6 ​ ​ 361.0 ​ ​ 717.3 ​ ​ 701.9 Total revenue ​ $ 3,213.7 ​ $ 3,265.5 ​ $ 6,480.4 ​ $ 6,578.7 ​
Schedule of net accounts receivable	​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2022 2021 ​ ​ (in millions) Billed ​ $ 2,053.9 ​ $ 2,181.1 Contract retentions ​ 505.2 ​ ​ 531.2 Total accounts receivable—gross ​ 2,559.1 ​ ​ 2,712.3 Allowance for doubtful accounts and credit losses ​ (109.0) ​ ​ (92.8) Total accounts receivable—net ​ $ 2,450.1 ​ $ 2,619.5

Joint Ventures and Variable I_2

Joint Ventures and Variable Interest Entities (Tables)	6 Months Ended
	Mar. 31, 2022
Joint Ventures and Variable Interest Entities
Summary of financial information of the consolidated joint ventures	​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ ​ ​ ​ 2022 ​ September 30, ​ ​ (unaudited) ​ 2021 ​ ​ (in millions) Current assets ​ $ 502.0 ​ $ 503.9 Non-current assets ​ 74.5 ​ 74.8 Total assets ​ $ 576.5 ​ $ 578.7 ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ $ 434.3 ​ $ 400.3 Non-current liabilities ​ 1.5 ​ 1.5 Total liabilities ​ 435.8 ​ 401.8 Total AECOM equity ​ 32.4 ​ 74.0 Noncontrolling interests ​ 108.3 ​ 102.9 Total owners’ equity ​ 140.7 ​ 176.9 Total liabilities and owners’ equity ​ $ 576.5 ​ $ 578.7
Summary of financial information of the unconsolidated joint ventures, as derived from their unaudited financial statements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ 2022 2021 ​ ​ (in millions) Current assets ​ $ 1,291.0 ​ $ 1,323.2 Non-current assets ​ 1,018.0 ​ 1,001.6 Total assets ​ $ 2,309.0 ​ $ 2,324.8 ​ ​ ​ ​ ​ ​ ​ Current liabilities ​ $ 782.0 ​ $ 845.8 Non-current liabilities ​ 529.3 ​ 537.2 Total liabilities ​ 1,311.3 ​ 1,383.0 Joint ventures’ equity ​ 997.7 ​ 941.8 Total liabilities and joint ventures’ equity ​ $ 2,309.0 ​ $ 2,324.8 ​ ​ ​ ​ ​ ​ ​ AECOM’s investment in unconsolidated joint ventures ​ $ 341.5 ​ $ 328.9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ March 31, ​ March 31, ​ 2022 2021 ​ ​ (in millions) Revenue ​ $ 925.1 ​ $ 1,229.4 Cost of revenue ​ 888.1 ​ 1,197.1 Gross profit ​ $ 37.0 ​ $ 32.3 Net income ​ $ 34.0 ​ $ 30.3
Summary of AECOM's equity in earnings of unconsolidated joint ventures	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ March 31, March 31, ​ 2022 2021 ​ (in millions) Pass-through joint ventures ​ $ 15.7 ​ $ 10.4 Other joint ventures ​ 4.2 ​ ​ 5.0 Total ​ $ 19.9 ​ $ 15.4

Pension Benefit Obligations (Ta

Pension Benefit Obligations (Tables)	6 Months Ended
	Mar. 31, 2022
Pension Benefit Obligations
Components of net periodic cost for the Company's pension and post-retirement plans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ March 31, 2022 ​ March 31, 2021 ​ March 31, 2022 ​ March 31, 2021 ​ ​ U.S. Int’l U.S. Int’l U.S. Int’l U.S. Int’l ​ ​ (in millions) Components of net periodic benefit cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service costs ​ $ — ​ $ 0.1 ​ $ — ​ $ 0.2 ​ $ — ​ $ 0.2 ​ $ — ​ $ 0.3 ​ Interest cost on projected benefit obligation ​ 1.1 ​ ​ 6.3 ​ ​ 1.1 ​ ​ 5.4 ​ 2.3 ​ 12.7 ​ ​ 2.1 ​ ​ 10.7 ​ Expected return on plan assets ​ (1.4) ​ ​ (10.8) ​ ​ (1.6) ​ ​ (11.0) ​ (2.8) ​ (21.8) ​ ​ (3.2) ​ ​ (21.5) ​ Amortization of net loss ​ 1.4 ​ ​ 1.8 ​ ​ 1.5 ​ ​ 2.3 ​ 2.8 ​ 3.7 ​ ​ 3.0 ​ ​ 4.5 ​ Settlement loss recognized ​ ​ 0.2 ​ ​ — ​ ​ — ​ ​ — ​ ​ 0.2 ​ ​ — ​ ​ — ​ ​ — ​ Net periodic benefit cost ​ $ 1.3 ​ $ (2.6) ​ $ 1.0 ​ $ (3.1) ​ $ 2.5 ​ $ (5.2) ​ $ 1.9 ​ $ (6.0) ​

Debt (Tables)

Debt (Tables)	6 Months Ended
	Mar. 31, 2022
Debt
Schedule of debt	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ 2022 2021 ​ ​ (in millions) Credit Agreement ​ $ 1,152.2 ​ $ 1,155.3 2027 Senior Notes ​ ​ 997.3 ​ ​ 997.3 Other debt ​ 81.4 ​ ​ 83.0 Total debt ​ 2,230.9 ​ ​ 2,235.6 Less: Current portion of debt and short-term borrowings ​ (42.8) ​ ​ (53.8) Less: Unamortized debt issuance costs ​ ​ (21.8) ​ ​ (24.1) Long-term debt ​ $ 2,166.3 ​ $ 2,157.7
Schedule of maturities of debt	​ ​ ​ ​ ​ Fiscal Year ​ ​ 2022 (six months remaining) ​ $ 22.6 2023 ​ 61.8 2024 ​ 45.1 2025 ​ 39.4 2026 ​ 402.1 Thereafter ​ 1,659.9 Total ​ $ 2,230.9

Derivative Financial Instrume_2

Derivative Financial Instruments and Fair Value Measurements (Tables)	6 Months Ended
	Mar. 31, 2022
Derivative Financial Instruments and Fair Value Measurements
Notional principle, fixed rates and related expiration dates of outstanding interest rate swap agreements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2022 Notional Amount ​ Notional Amount ​ Fixed ​ Effective ​ Expiration Currency (in millions) Rate ​ Date Date USD ​ 200.0 2.60% ​ March 2018 ​ February 2023 USD ​ 400.0 ​ 1.349% ​ February 2023 ​ March 2028 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2021 Notional Amount ​ Notional Amount ​ Fixed ​ Effective ​ Expiration Currency (in millions) Rate ​ Date Date USD ​ 200.0 ​ 2.60% ​ March 2018 ​ February 2023 USD ​ 400.0 1.349% ​ February 2023 ​ March 2028

Share-based Payments (Tables)

Share-based Payments (Tables)	6 Months Ended
	Mar. 31, 2022
Share-based Payments
Schedule of stock option activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ 2021 ​ ​ Shares of stock ​ Weighted average ​ Shares of stock ​ Weighted average ​ under options exercise price under options exercise price ​ ​ (in millions) ​ ​ ​ ​ (in millions) ​ ​ ​ Outstanding at September 30 ​ 0.3 ​ $ 38.72 ​ 0.4 ​ $ 36.41 Options granted ​ — ​ ​ — ​ — ​ ​ — Options exercised ​ — ​ ​ — ​ (0.1) ​ ​ 31.62 Options forfeited or expired ​ — ​ ​ — ​ — ​ ​ — Outstanding at March 31 ​ 0.3 ​ ​ 38.72 ​ 0.3 ​ ​ 38.72 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Vested and expected to vest in the future as of March 31 ​ 0.2 ​ $ 38.72 ​ 0.2 ​ $ 38.72

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Mar. 31, 2022
Earnings Per Share
Reconciliation of the denominators for basic and diluted EPS	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ March 31, ​ March 31, March 31, March 31, ​ 2022 2021 2022 2021 ​ ​ (in millions) Denominator for basic earnings per share ​ 141.1 ​ 147.8 ​ 141.4 ​ 149.6 Potential common shares ​ 1.5 ​ 1.7 ​ 2.2 ​ 2.0 Denominator for diluted earnings per share ​ 142.6 ​ 149.5 ​ 143.6 ​ 151.6

Leases (Tables)

Leases (Tables)	6 Months Ended
	Mar. 31, 2022
Leases
Schedule of components of lease expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ March 31, 2022 March 31, 2021 March 31, 2022 March 31, 2021 ​ ​ (in millions) Operating lease cost ​ $ 43.7 ​ $ 47.2 ​ $ 87.8 ​ $ 94.7 Finance lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization of right-of-use assets ​ 4.6 ​ ​ 3.9 ​ ​ 8.7 ​ ​ 6.4 Interest on lease liabilities ​ 0.6 ​ ​ 0.4 ​ ​ 1.1 ​ ​ 1.2 Variable lease cost ​ 8.3 ​ ​ 9.5 ​ ​ 16.4 ​ ​ 18.7 Total lease cost ​ $ 57.2 ​ $ 61.0 ​ $ 114.0 ​ $ 121.0
Schedule of additional balance sheet information related to leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of (in millions except as noted) Balance Sheet Classification March 31, 2022 September 30, 2021 Assets: ​ ​ ​ ​ Operating lease assets Operating lease right-of-use assets ​ $ 570.6 ​ $ 607.1 Finance lease assets Property and equipment – net ​ ​ 53.6 ​ ​ 44.4 Total lease assets ​ $ 624.2 ​ $ 651.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ Current: ​ ​ ​ ​ ​ ​ Operating lease liabilities Accrued expenses and other current liabilities ​ $ 154.0 ​ $ 157.3 Finance lease liabilities Current portion of long-term debt ​ ​ 17.9 ​ ​ 13.4 Total current lease liabilities ​ ​ 171.9 ​ ​ 170.7 Non-current: ​ ​ ​ ​ ​ ​ Operating lease liabilities Operating lease liabilities, noncurrent ​ ​ 636.2 ​ ​ 679.1 Finance lease liabilities Long-term debt ​ ​ 37.1 ​ ​ 32.1 Total non-current lease liabilities ​ $ 673.3 ​ $ 711.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ ​ March 31, 2022 September 30, 2021 ​ Weighted average remaining lease term (in years): ​ ​ ​ Operating leases 6.6 ​ 6.9 ​ Finance leases 3.4 ​ 3.5 ​ Weighted average discount rates: ​ ​ ​ ​ Operating leases 4.1 % 4.3 % Finance leases 3.9 % 4.3 %
Schedule of additional cash flow information related to leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended ​ ​ March 31, ​ March 31, ​ 2022 2021 ​ ​ (in millions) Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ ​ Operating cash flows from operating leases ​ $ 102.7 ​ $ 113.0 Operating cash flows from finance leases ​ ​ 1.1 ​ ​ 0.9 Financing cash flows from finance leases ​ ​ 9.7 ​ ​ 6.0 Right-of-use assets obtained in exchange for new operating leases ​ ​ 31.9 ​ ​ 67.4 Right-of-use assets obtained in exchange for new finance leases ​ ​ 18.4 ​ ​ 13.4
Schedule of total remaining lease payments under the Company's operating and finance leases	​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases Finance Leases Fiscal Year ​ (in millions) 2022 (six months remaining) ​ $ 95.9 ​ $ 9.6 2023 ​ 166.4 ​ ​ 19.6 2024 ​ 142.4 ​ ​ 15.9 2025 ​ 119.1 ​ ​ 9.9 2026 ​ ​ 94.6 ​ ​ 3.3 Thereafter ​ 288.0 ​ ​ 0.4 Total lease payments ​ $ 906.4 ​ $ 58.7 Less: Amounts representing interest ​ $ (116.2) ​ $ (3.7) Total lease liabilities ​ $ 790.2 ​ $ 55.0

Other Financial Information (Ta

Other Financial Information (Tables)	6 Months Ended
	Mar. 31, 2022
Other Financial Information
Schedule of accrued expenses and other current liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, September 30, ​ ​ 2022 ​ 2021 ​ ​ (in millions) Accrued salaries and benefits ​ $ 639.2 ​ $ 661.8 Accrued contract costs ​ 1,228.5 ​ ​ 1,202.1 Other accrued expenses ​ 351.3 ​ ​ 310.3 ​ ​ $ 2,219.0 ​ $ 2,174.2

Reclassifications out of Accu_2

Reclassifications out of Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Mar. 31, 2022
Reclassifications out of Accumulated Other Comprehensive Loss
Schedule of accumulated balances and reporting period activities related to reclassifications out of accumulated other comprehensive loss	The accumulated balances and reporting period activities for the three and six months ended March 31, 2022 and 2021 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ ​ Related ​ Translation ​ Derivative ​ Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at December 31, 2021 ​ $ (313.4) ​ $ (585.3) ​ $ (0.5) ​ $ (899.2) Other comprehensive income (loss) before reclassification ​ ​ 6.5 ​ ​ (10.4) ​ ​ 16.1 ​ ​ 12.2 Amounts reclassified from accumulated other comprehensive loss ​ ​ 2.5 ​ ​ 19.5 ​ ​ 0.9 ​ ​ 22.9 Balances at March 31, 2022 ​ $ (304.4) ​ $ (576.2) ​ $ 16.5 ​ $ (864.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ ​ Related ​ Translation ​ Derivative ​ Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at December 31, 2020 ​ $ (353.5) ​ $ (515.6) ​ $ (7.7) ​ $ (876.8) Other comprehensive (loss) income before reclassification ​ (3.0) ​ ​ (20.0) ​ ​ 0.2 ​ ​ (22.8) Amounts reclassified from accumulated other comprehensive loss ​ ​ 3.0 ​ ​ — ​ ​ 0.9 ​ ​ 3.9 Balances at March 31, 2021 ​ $ (353.5) ​ $ (535.6) ​ $ (6.6) ​ $ (895.7) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ Related Translation Derivative Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at September 30, 2021 ​ $ (316.2) ​ $ (580.1) ​ $ (4.1) ​ $ (900.4) Other comprehensive (loss) income before reclassification ​ 6.8 ​ ​ (15.6) ​ ​ 18.8 ​ ​ 10.0 Amounts reclassified from accumulated other comprehensive loss ​ 5.0 ​ ​ 19.5 ​ ​ 1.8 ​ ​ 26.3 Balances at March 31, 2022 ​ $ (304.4) ​ $ (576.2) ​ $ 16.5 ​ $ (864.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ Accumulated ​ ​ Pension ​ Currency ​ (Loss)/Gain on ​ Other ​ ​ Related ​ Translation ​ Derivative ​ Comprehensive ​ Adjustments Adjustments Instruments Loss Balances at September 30, 2020 ​ $ (342.8) ​ $ (567.3) ​ $ (8.6) ​ $ (918.7) Other comprehensive (loss) income before reclassification ​ (16.7) ​ ​ 31.7 ​ ​ 0.2 ​ ​ 15.2 Amounts reclassified from accumulated other comprehensive loss ​ 6.0 ​ ​ — ​ ​ 1.8 ​ ​ 7.8 Balances at March 31, 2021 ​ $ (353.5) ​ $ (535.6) ​ $ (6.6) ​ $ (895.7)

Reportable Segments (Tables)

Reportable Segments (Tables)	3 Months Ended
	Dec. 31, 2021
Reportable Segments
Summarized financial information concerning the Company's reportable segments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ AECOM ​ ​ ​ ​ ​ ​ ​ Reportable Segments: Americas International Capital Corporate Total ​ ​ ​ ($ in millions) Three Months Ended March 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 2,399.9 ​ $ 813.3 ​ $ 0.5 ​ $ — ​ $ 3,213.7 ​ Gross profit ​ 160.4 ​ 49.1 ​ 0.5 ​ ​ — ​ ​ 210.0 ​ Equity in earnings of joint ventures ​ 3.2 ​ 5.7 ​ 3.1 ​ ​ — ​ ​ 12.0 ​ General and administrative expenses ​ — ​ — ​ (2.6) ​ ​ (34.6) ​ ​ (37.2) ​ Restructuring costs ​ ​ — ​ ​ — ​ ​ — ​ ​ (73.3) ​ ​ (73.3) ​ Operating income ​ 163.6 ​ 54.8 ​ 1.0 ​ ​ (107.9) ​ ​ 111.5 ​ Gross profit as a % of revenue ​ 6.7 % 6.0 % — ​ ​ — ​ ​ 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 2,468.3 ​ $ 796.5 ​ $ 0.7 ​ $ — ​ $ 3,265.5 ​ Gross profit ​ 151.7 ​ 42.8 ​ ​ 0.7 ​ — ​ 195.2 ​ Equity in earnings of joint ventures ​ 3.0 ​ 3.0 ​ ​ 1.2 ​ — ​ 7.2 ​ General and administrative expenses ​ — ​ — ​ ​ (1.5) ​ (34.5) ​ (36.0) ​ Restructuring costs ​ ​ — ​ ​ — ​ ​ — ​ ​ (8.8) ​ ​ (8.8) ​ Operating income ​ ​ 154.7 ​ ​ 45.8 ​ ​ 0.4 ​ ​ (43.3) ​ ​ 157.6 ​ Gross profit as a % of revenue ​ 6.1 % ​ 5.4 % ​ — ​ ​ — ​ ​ 6.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 4,863.4 ​ $ 1,615.7 ​ $ 1.3 ​ $ — ​ $ 6,480.4 ​ Gross profit ​ ​ 310.4 ​ ​ 98.5 ​ ​ 1.3 ​ ​ — ​ ​ 410.2 ​ Equity in earnings of joint ventures ​ ​ 6.4 ​ ​ 9.3 ​ ​ 4.2 ​ ​ — ​ ​ 19.9 ​ General and administrative expenses ​ ​ — ​ ​ — ​ ​ (5.6) ​ ​ (68.0) ​ ​ (73.6) ​ Restructuring costs ​ ​ — ​ ​ — ​ ​ — ​ ​ (76.7) ​ ​ (76.7) ​ Operating income (loss) ​ ​ 316.8 ​ ​ 107.8 ​ ​ (0.1) ​ ​ (144.7) ​ ​ 279.8 ​ Gross profit as a % of revenue ​ ​ 6.4 % ​ 6.1 % ​ — ​ ​ — ​ ​ 6.3 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 5,025.6 ​ $ 1,552.1 ​ $ 1.0 ​ $ — ​ $ 6,578.7 ​ Gross profit ​ 296.7 ​ 81.9 ​ ​ 1.0 ​ — ​ 379.6 ​ Equity in earnings of joint ventures ​ 4.4 ​ 6.0 ​ ​ 5.0 ​ — ​ 15.4 ​ General and administrative expenses ​ — ​ — ​ ​ (3.4) ​ (71.0) ​ (74.4) ​ Restructuring costs ​ — ​ — ​ ​ — ​ (21.8) ​ (21.8) ​ Operating income ​ 301.1 ​ 87.9 ​ ​ 2.6 ​ (92.8) ​ 298.8 ​ Gross profit as a % of revenue ​ 5.9 % 5.3 % ​ — ​ ​ — ​ 5.8 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reportable Segments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2022 ​ $ 7,134.9 ​ $ 2,593.1 ​ $ 236.6 ​ $ 1,147.1 ​ ​ ​ September 30, 2021 ​ $ 7,204.6 ​ $ 2,764.5 ​ $ 234.6 ​ $ 1,390.9 ​ ​ ​

Basis of Presentation (Details)

Basis of Presentation (Details)	6 Months Ended
	Mar. 31, 2022
Minimum
Basis of presentation
Length of fiscal year	364 days
Maximum
Basis of presentation
Length of fiscal year	371 days

New Accounting Pronouncements_2

New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021	Oct. 01, 2020
New Accounting Pronouncements and Changes in Accounting
Accumulated deficits	$ 706,783	$ 504,126
ASU 2016-06
New Accounting Pronouncements and Changes in Accounting
Accumulated deficits			$ 8,000

Discontinued Operations, Good_3

Discontinued Operations, Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Jan. 28, 2022	Dec. 31, 2021	Mar. 31, 2021	Mar. 31, 2022	Sep. 30, 2021
Summary of financial information of the Disposal Group is as follows:
Non-current assets held for sale				$ 6,777
Long-term liabilities held for sale				345	$ 11,095
Held for sale
Summary of financial information of the Disposal Group
Contingent consideration, prior work claims				43,900
Summary of financial information of the Disposal Group is as follows:
Cash and cash equivalents				2,100	5,600
Receivables and contract assets				43,600	90,300
Other				32,000	43,500
Current assets held for sale				77,700	139,400
Property and equipment, net				6,800	52,900
Other					18,500
Write-down of assets to fair value less cost to sell					(71,400)
Non-current assets held for sale				6,800
Accounts payable and accrued expenses				47,900	88,500
Other					5,500
Current liabilities held for sale				47,900	94,000
Long-term liabilities held for sale				$ 300	$ 11,100
Held for sale | Power construction business
Summary of financial information of the Disposal Group
Pre-tax gain (loss)		$ (17,300)
Held for sale | Civil infrastructure construction business
Summary of financial information of the Disposal Group
Pre-tax gain (loss)			$ (32,800)
Held for sale | Oil and gas construction business
Summary of financial information of the Disposal Group
Consideration	$ 14,000
Pre-tax gain (loss)	$ 3,000

Discontinued Operations, Good_4

Discontinued Operations, Goodwill and Intangible Assets - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Summary of financial information of the Disposal Group
Impairment of long-lived assets				$ (95,814)
Net loss from discontinued operations	$ (6,113)	$ (47,914)	$ (68,053)	(103,666)
Held for sale
Summary of financial information of the Disposal Group
Revenue	84,700	113,000	211,800	443,700
Cost of revenue	84,300	117,900	229,600	440,800
Gross (loss) profit	400	(4,900)	(17,800)	2,900
Equity in earnings of joint ventures		300	(3,400)	8,000
Loss on disposal activities	(3,400)	(38,800)	(45,500)	(50,100)
Transaction costs	(3,900)	(2,700)	(6,200)	(13,600)
Impairment of long-lived assets				(95,800)
Loss from operations	(6,900)	(46,100)	(72,900)	(148,600)
Interest expense		(100)	(100)	(300)
Loss before taxes	(6,900)	(46,200)	(73,000)	(148,900)
Income tax benefit	(900)	1,700	(5,000)	(45,200)
Net loss from discontinued operations	$ (6,000)	$ (47,900)	$ (68,000)	$ (103,700)

Discontinued Operations, Good_5

Discontinued Operations, Goodwill and Intangible Assets - Significant components included in Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Held for sale
Summary of financial information of the Disposal Group
Payments for capital expenditures	$ (0.6)	$ (1.6)	$ (1.5)	$ (4.6)

Discontinued Operations, Good_6

Discontinued Operations, Goodwill and Intangible Assets - Segments (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2022USD ($)
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	$ 3,502,499
Foreign Exchange Impact	(12,000)
Goodwill at the end of the period	3,490,544
Americas
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	2,626,400
Foreign Exchange Impact	2,200
Goodwill at the end of the period	2,628,600
International
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	876,100
Foreign Exchange Impact	(14,200)
Goodwill at the end of the period	$ 861,900

Discontinued Operations, Good_7

Discontinued Operations, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Identifiable intangible assets with finite useful lives
Intangible Assets, Net	$ 45,486	$ 54,867
Minimum
Identifiable intangible assets with finite useful lives
Amortization Period	1 year
Maximum
Identifiable intangible assets with finite useful lives
Amortization Period	11 years
Customer Relationships
Identifiable intangible assets with finite useful lives
Gross Amount	$ 663,500	663,400
Accumulated Amortization	(618,000)	(608,500)
Intangible Assets, Net	$ 45,500	$ 54,900

Discontinued Operations, Good_8

Discontinued Operations, Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Estimated amortization expense for the succeeding years
2022 (six months remaining)	$ 9,200
2023	18,200
2024	17,400
2025	700
Intangible Assets, Net	45,486		$ 54,867
Amortization expense	$ 9,500	$ 10,700

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Billions	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
ASU 2014-09
Revenue Recognition
Subcontractor and other direct costs	$ 3.3	$ 3.5

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenue Recognition
Total revenue	$ 3,213.7	$ 3,265.5	$ 6,480.4	$ 6,578.7
Cost reimbursable
Revenue Recognition
Total revenue	1,378.9	1,405.2	2,686.5	2,732.6
Guaranteed maximum price
Revenue Recognition
Total revenue	1,004.9	1,015.2	2,072.6	2,213.1
Fixed price
Revenue Recognition
Total revenue	829.9	845.1	1,721.3	1,633
Americas.
Revenue Recognition
Total revenue	2,400.5	2,469.1	4,864.6	5,026.6
EMEA
Revenue Recognition
Total revenue	457.6	435.4	898.5	850.2
Asia Pacific
Revenue Recognition
Total revenue	$ 355.6	$ 361	$ 717.3	$ 701.9

Revenue Recognition - Performan

Revenue Recognition - Performance obligations (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, remaining performance obligations
Performance obligation	$ 22,300
Liability recognized	$ 458.5	$ 584.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, remaining performance obligations
Performance Obligation expected timing of satisfaction period	12 months
Performance obligation, percent to be satisfied	55.00%

Revenue Recognition - Accounts

Revenue Recognition - Accounts receivable, net (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Billed	$ 2,053,900	$ 2,181,100
Contract retentions	505,200	531,200
Total accounts receivable-gross	2,559,100	2,712,300
Allowance for doubtful accounts and credit losses	(109,000)	(92,800)
Total accounts receivable-net	$ 2,450,085	$ 2,619,491
Additional disclosures
Unbilled receivables are expected to be billed and collected (in months)	12 months	12 months
Significant claims recorded in contract assets and other non-current assets	$ 140,000	$ 140,000
Trade receivables sold, outstanding	$ 223,700	$ 263,600
Other than U.S government outstanding receivables
Additional disclosures
Number of clients	No	No
Other than U.S government outstanding receivables | Customer concentration risk
Additional disclosures
Concentration Risk Threshold Percentage	10.00%	10.00%

Joint Ventures and Variable I_3

Joint Ventures and Variable Interest Entities - Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financial Information
Current assets	$ 5,697,176		$ 5,697,176			$ 6,173,543
TOTAL ASSETS	11,196,063		11,196,063			11,733,954
Current liabilities	5,283,478		5,283,478			5,521,715
TOTAL LIABILITIES	8,546,410		8,546,410			8,904,377
Total AECOM equity	2,531,442		2,531,442			2,712,470
Noncontrolling interests	118,211		118,211			117,107
TOTAL STOCKHOLDERS' EQUITY	2,649,653	$ 2,926,700	2,649,653	$ 2,926,700	$ 2,626,239	2,829,577	$ 3,020,177	$ 3,413,544
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	11,196,063		11,196,063			11,733,954
Revenue	3,213,658	$ 3,265,573	6,480,374	6,578,728
Consolidated Joint Ventures
Financial Information
Current assets	502,000		502,000			503,900
Non-current assets	74,500		74,500			74,800
TOTAL ASSETS	576,500		576,500			578,700
Current liabilities	434,300		434,300			400,300
Non-current liabilities	1,500		1,500			1,500
TOTAL LIABILITIES	435,800		435,800			401,800
Total AECOM equity	32,400		32,400			74,000
Noncontrolling interests	108,300		108,300			102,900
TOTAL STOCKHOLDERS' EQUITY	140,700		140,700			176,900
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 576,500		576,500			$ 578,700
Revenue			$ 627,300	$ 379,800

Joint Ventures and Variable I_4

Joint Ventures and Variable Interest Entities - Unconsolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financial Information
Current assets	$ 5,697,176		$ 5,697,176			$ 6,173,543
TOTAL ASSETS	11,196,063		11,196,063			11,733,954
Current liabilities	5,283,478		5,283,478			5,521,715
TOTAL LIABILITIES	8,546,410		8,546,410			8,904,377
Joint ventures' equity	2,649,653	$ 2,926,700	2,649,653	$ 2,926,700	$ 2,626,239	2,829,577	$ 3,020,177	$ 3,413,544
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	11,196,063		11,196,063			11,733,954
AECOM's investment in unconsolidated joint ventures	341,452		341,452			328,906
Joint ventures summarized financial information
Revenue	3,213,658	3,265,573	6,480,374	6,578,728
Cost of revenue	3,003,706	3,070,314	6,070,218	6,199,099
Gross profit	209,952	195,259	410,156	379,629
Net income	48,513	$ 45,278	109,790	78,300
Unconsolidated Joint Ventures
Financial Information
Current assets	1,291,000		1,291,000			1,323,200
Non-current assets	1,018,000		1,018,000			1,001,600
TOTAL ASSETS	2,309,000		2,309,000			2,324,800
Current liabilities	782,000		782,000			845,800
Non-current liabilities	529,300		529,300			537,200
TOTAL LIABILITIES	1,311,300		1,311,300			1,383,000
Joint ventures' equity	997,700		997,700			941,800
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,309,000		2,309,000			2,324,800
AECOM's investment in unconsolidated joint ventures	$ 341,500		341,500			$ 328,900
Joint ventures summarized financial information
Revenue			925,100	1,229,400
Cost of revenue			888,100	1,197,100
Gross profit			37,000	32,300
Net income			$ 34,000	$ 30,300

Joint Ventures and Variable I_5

Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Financial Information
Equity in earnings of joint ventures	$ 11,919	$ 7,157	$ 19,869	$ 15,358
Unconsolidated Joint Ventures
Financial Information
Equity in earnings of joint ventures			19,900	15,400
Unconsolidated Joint Ventures | Pass through joint ventures
Financial Information
Equity in earnings of joint ventures			15,700	10,400
Unconsolidated Joint Ventures | Other joint ventures
Financial Information
Equity in earnings of joint ventures			$ 4,200	$ 5,000

Pension Benefit Obligations (De

Pension Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2022
United States
Percentage of Plan Assets:
Interest cost on projected benefit obligation	$ 1.1	$ 1.1	$ 2.3	$ 2.1
Expected return on plan assets	(1.4)	(1.6)	(2.8)	(3.2)
Amortization of net loss	1.4	1.5	2.8	3
Settlement loss recognized	0.2		0.2
Net periodic benefit cost	1.3	1	2.5	1.9
Change in benefit obligation:
Employer contributions to Multiemployer Pension Plans			4.8
Expected remaining scheduled annual employer contributions for the current fiscal year					$ 6.6
International.
Percentage of Plan Assets:
Service costs	0.1	0.2	0.2	0.3
Interest cost on projected benefit obligation	6.3	5.4	12.7	10.7
Expected return on plan assets	(10.8)	(11)	(21.8)	(21.5)
Amortization of net loss	1.8	2.3	3.7	4.5
Net periodic benefit cost	$ (2.6)	$ (3.1)	(5.2)	$ (6)
Change in benefit obligation:
Employer contributions to Multiemployer Pension Plans			$ 12.2
Expected remaining scheduled annual employer contributions for the current fiscal year					$ 12.8

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Debt
Total debt	$ 2,230,900	$ 2,235,600
Less: Current portion of debt and short-term borrowings	(42,800)	(53,800)
Less: Unamortized debt issuance costs	(21,800)	(24,100)
Long-term debt	2,166,310	2,157,740
Credit Agreement
Debt
Total debt	1,152,200	1,155,300
2027 Senior Notes
Debt
Total debt	997,300	997,300
Other Debt
Debt
Total debt	$ 81,400	$ 83,000

Debt - Scheduled Maturities (De

Debt - Scheduled Maturities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Debt
2022 (six months remaining)	$ 22.6
2023	61.8
2024	45.1
2025	39.4
2026	402.1
Thereafter	1,659.9
Total debt	$ 2,230.9	$ 2,235.6

Debt - Credit Agreement (Detail

Debt - Credit Agreement (Details)	Apr. 13, 2021USD ($)	Feb. 08, 2021USD ($)	Mar. 31, 2022USD ($)	Mar. 31, 2021USD ($)	Sep. 30, 2021USD ($)	Jun. 25, 2021USD ($)
Debt agreements
Current borrowing capacity			$ 432,300,000
Proceeds from secured delayed draw term loan facility			1,335,742,000	$ 1,251,766,000
2014 Credit Agreement | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)		0.225%
2014 Credit Agreement | LIBOR
Debt agreements
Interest rate, basis spread (as a percent)		1.225%
2014 Credit Agreement | Term loan A
Debt agreements
Maximum borrowing capacity						$ 215,000,000
2014 Credit Agreement | Term B facility
Debt agreements
Maximum borrowing capacity	$ 700,000,000
2014 Credit Agreement | Term B facility | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)	0.75%
2014 Credit Agreement | Term B facility | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)	1.75%
2014 Credit Agreement | Revolving credit facility
Debt agreements
Current borrowing capacity			1,145,500,000		$ 1,144,800,000
Outstanding letters of credit			$ 4,500,000		$ 5,200,000
Credit Agreement | Minimum
Debt agreements
Consolidated leverage ratio		1	1
Consolidated interest coverage ratio		1
Credit Agreement | Maximum
Debt agreements
Consolidated leverage ratio		4	2.30
Consolidated interest coverage ratio		3
Credit Agreement | Term loan A
Debt agreements
Maximum borrowing capacity		$ 246,968,737.50
Credit Agreement | Revolving credit facility
Debt agreements
Maximum borrowing capacity		$ 1,150,000,000
2024 Senior Notes
Debt agreements
Cash tender	$ 700,000,000
Interest rate (as a percent)	5.875%					5.875%

Debt - 2027 Senior Notes (Detai

Debt - 2027 Senior Notes (Details) - 2027 Senior Notes - USD ($)	Feb. 21, 2017	Mar. 31, 2022
Debt
Face amount	$ 1,000,000,000
Fair value of debt instrument		$ 1,017,200,000
Interest rate (as a percent)	5.125%
At any time and from time to time prior to December 15, 2026
Debt
Redemption price (in percent)	100.00%
At any time on or after December 15, 2026
Debt
Redemption price (in percent)	100.00%

Debt - Effective Interest Rate

Debt - Effective Interest Rate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Debt
Effective interest rate including effects of interest rate swap agreements			3.3%	5.1%
Amortization of deferred debt issuance costs	$ 1.2	$ 2.6	$ 2.5	$ 4.4

Derivative Financial Instrume_3

Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Derivative financial instruments
Fixed Rate (as a percent)	1.349%
Interest Rate Swap
Derivative financial instruments
Notional Amount		$ 400
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | USD | March 2018
Derivative financial instruments
Notional Amount	$ 200	$ 200
Fixed Rate (as a percent)	2.60%	2.60%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | USD | February 2023
Derivative financial instruments
Notional Amount	$ 400	$ 400
Fixed Rate (as a percent)	1.349%	1.349%

Derivative Financial Instrume_4

Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - Interest Rate Swap - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Other current assets
Derivative financial instruments
Fair values of the interest rate swap agreements	$ 0.7
Other non-current assets
Derivative financial instruments
Fair values of the interest rate swap agreements	23.9	$ 1.2
Other current liabilities
Derivative financial instruments
Fair values of the interest rate swap agreements	1.5	5
Other long-term liabilities
Derivative financial instruments
Fair values of the interest rate swap agreements		$ 1.8
Designated as Hedging Instrument | Cash Flow Hedging
Derivative financial instruments
Losses recognized in income	$ 0

Share-based Payments (Details)

Share-based Payments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Stock options, Weighted average exercise price
Vesting period			3 years
Recognized compensation expense	$ 21.7	$ 24.6
Unrecognized compensation expense	$ 65.7		$ 65.7		$ 45.6
Performance Earnings Program
Stock options, Weighted average exercise price
Vesting period			3 years
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 85.48	$ 52.52
Restricted Stock Units (RSUs)
Stock options, Weighted average exercise price
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 74.32	$ 48.78
Employee Stock Option
Shares of stock under options
Balance at the beginning of the period (in shares)			0.3	0.4
Options granted (in shares)			0	0
Options exercised (in shares)			0	(0.1)
Options forfeited or expired ( in shares)			0	0
Balance at the end of the period (in shares)	0.3	0.3	0.3	0.3
Vested and expected to vest in the future at the end of the period (in shares)	0.2	0.2	0.2	0.2
Stock options, Weighted average exercise price
Balance at the beginning of the period (in dollars per share)			$ 38.72	$ 36.41
Options granted (in dollars per share)			0	0
Options exercised (in dollars per share)			0	31.62
Options forfeited or expired (in dollars per share)			0	0
Balance at the end of the period (in dollars per share)	$ 38.72	$ 38.72	38.72	38.72
Vested and expected to vest in the future at the end of the period (in dollars per share)	$ 38.72	$ 38.72	$ 38.72	$ 38.72

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Taxes
Effective tax rate (as a percent)	24.80%	25.00%
Tax at federal statutory rate (as a percent)	21.00%	21.00%
Income tax credits and incentives	$ 26.5	$ 28.4
Tax expense related to nondeductible costs		3.2
Benefit related to release of valuation allowance on foreign tax credits	13.9
Tax expense related to Foreign residual income	19.5	20.7
State income tax, net of federal benefit	11.1	$ 10.7
Tax benefit related to the release of a valuation allowance on net operating losses	21.9
Gross book-tax differences from non-U.S. subsidiaries	1,500
Valuation allowances	14.9
Valuation allowance	$ 6.4

Earnings Per Share (Details)

Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share
Denominator for basic earnings per share	141,060	147,770	141,419	149,597
Potential common shares	1,500	1,700	2,200	2,000
Denominator for diluted earnings per share	142,626	149,519	143,631	151,632

Leases - Components of lease ex

Leases - Components of lease expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Operating lease cost
Operating lease cost	$ 43.7	$ 47.2	$ 87.8	$ 94.7
Finance lease cost
Amortization of right-of-use assets	4.6	3.9	8.7	6.4
Interest on lease liabilities	0.6	0.4	1.1	1.2
Variable lease cost	8.3	9.5	16.4	18.7
Total lease cost	$ 57.2	$ 61	$ 114	$ 121

Leases - Additional balance she

Leases - Additional balance sheet information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
ASSETS
Operating lease assets	$ 570,603	$ 607,076
Balance Sheet classification of operating lease assets	Operating lease assets	Operating lease assets
Finance lease assets	$ 53,600	$ 44,400
Balance Sheet classification of finance lease assets	PROPERTY AND EQUIPMENT-NET	PROPERTY AND EQUIPMENT-NET
Total lease assets	$ 624,200	$ 651,500
Current:
Operating lease liabilities	$ 154,000	$ 157,300
Balance Sheet classification of operating lease liabilities	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Finance lease liabilities	$ 17,900	$ 13,400
Balance Sheet classification of finance lease liabilities	Current portion of long-term debt	Current portion of long-term debt
Total current lease liabilities	$ 171,900	$ 170,700
Operating lease liabilities	$ 636,236	$ 679,059
Balance Sheet classification of operating lease liabilities	Operating lease liabilities	Operating lease liabilities
Finance lease liabilities	$ 37,100	$ 32,100
Balance Sheet classification of finance lease liabilities	LONG-TERM DEBT	LONG-TERM DEBT
Total non-current lease liabilities	$ 673,300	$ 711,200
Weighted average remaining lease term (in years):
Operating leases	6 years 7 months 6 days	6 years 10 months 24 days
Finance leases	3 years 4 months 24 days	3 years 6 months
Weighted average discount rates:
Operating leases	4.10%	4.30%
Finance leases	3.90%	4.30%

Leases - Additional cash flow i

Leases - Additional cash flow information (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 102.7	$ 113
Operating cash flows from finance leases	1.1	0.9
Financing cash flows from finance leases	9.7	6
Right-of-use assets obtained in exchange for new operating leases	31.9	67.4
Right-of-use assets obtained in exchange for new finance leases	$ 18.4	$ 13.4

Leases - Total remaining lease

Leases - Total remaining lease payments under the Company's operating lease (Details) $ in Millions	Mar. 31, 2022USD ($)
Amounts payable under non-cancelable operating lease commitments
2022 (six months remaining)	$ 95.9
2023	166.4
2024	142.4
2025	119.1
2026	94.6
Thereafter	288
Total lease payments	906.4
Less: Amounts representing interest	(116.2)
Total lease liabilities	$ 790.2

Leases - Total remaining leas_2

Leases - Total remaining lease payments under the Company's finance lease (Details) $ in Millions	Mar. 31, 2022USD ($)
Leases
2022 (six months remaining)	$ 9.6
2023	19.6
2024	15.9
2025	9.9
2026	3.3
Thereafter	0.4
Total lease payments	58.7
Less: Amounts representing interest	3.7
Total lease liabilities	$ 55

Other Financial Information (De

Other Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2022	Mar. 03, 2022	Sep. 30, 2021
Accrued expenses and other current liabilities
Accrued salaries and benefits	$ 639,200		$ 639,200		$ 661,800
Accrued contract costs	1,228,500		1,228,500		1,202,100
Other accrued expenses	351,300		351,300		310,300
Total accrued expenses	2,218,969		2,218,969		$ 2,174,200		$ 2,174,201
Restructuring costs	73,292	$ 8,746	76,663	$ 21,784
Accrued restructuring expenses	600	$ 3,700	600	3,700
Restructuring cost related to margins and delivery efficiency			7,600
Dividend paid per share in cash						$ 0.15
Accrued and unpaid dividend	21,800		21,800
Foreign Currency Translation Adjustments
Accrued expenses and other current liabilities
Amounts reclassified from accumulated other comprehensive (loss) income	19,500		19,500
Personnel and other costs
Accrued expenses and other current liabilities
Restructuring costs			5,400	16,800
Real estate costs
Accrued expenses and other current liabilities
Restructuring costs			2,200	$ 5,000
Facility Closing [Member] | RUSSIAN FEDERATION
Accrued expenses and other current liabilities
Restructuring costs	69,100		69,100
Accrued restructuring expenses	5,800		5,800
Facility Closing [Member] | RUSSIAN FEDERATION | Foreign Currency Translation Adjustments
Accrued expenses and other current liabilities
Amounts reclassified from accumulated other comprehensive (loss) income			19,500
Professional liability accrual
Accrued expenses and other current liabilities
Accrued contract costs	$ 742,300		$ 742,300				$ 736,400

Reclassifications out of Accu_3

Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Accumulated balances
Balance at the beginning of the period			$ (900,377)
Balance at the end of the period	$ (864,087)		(864,087)
Pension Related Adjustments
Accumulated balances
Balance at the beginning of the period	(313,400)	$ (353,500)	(316,200)	$ (342,800)
Other comprehensive income (loss) before reclassification	6,500	(3,000)	6,800	(16,700)
Amounts reclassified from accumulated other comprehensive (loss) income	2,500	3,000	5,000	6,000
Balance at the end of the period	(304,400)	(353,500)	(304,400)	(353,500)
Foreign Currency Translation Adjustments
Accumulated balances
Balance at the beginning of the period	(585,300)	(515,600)	(580,100)	(567,300)
Other comprehensive income (loss) before reclassification	(10,400)	(20,000)	(15,600)	31,700
Amounts reclassified from accumulated other comprehensive (loss) income	19,500		19,500
Balance at the end of the period	(576,200)	(535,600)	(576,200)	(535,600)
(Loss)/Gain on Derivative Instruments
Accumulated balances
Balance at the beginning of the period	(500)	(7,700)	(4,100)	(8,600)
Other comprehensive income (loss) before reclassification	16,100	200	18,800	200
Amounts reclassified from accumulated other comprehensive (loss) income	900	900	1,800	1,800
Balance at the end of the period	16,500	(6,600)	16,500	(6,600)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated balances
Balance at the beginning of the period	(899,200)	(876,800)	(900,400)	(918,700)
Other comprehensive income (loss) before reclassification	12,200	(22,800)	10,000	15,200
Amounts reclassified from accumulated other comprehensive (loss) income	22,900	3,900	26,300	7,800
Balance at the end of the period	$ (864,100)	$ (895,700)	$ (864,100)	$ (895,700)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Jan. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2022	Sep. 30, 2021	Dec. 06, 2019	Dec. 31, 2014
Commitments and Contingencies
Unsecured credit facilities					$ 432.3
New York
Commitments and Contingencies
Contingency liability					146
Percentage of claim recoveries due to seller	90.00%
Percentage of claim recoveries due to purchaser	10.00%
Montana
Commitments and Contingencies
Damages sought			$ 132	$ 79
Damages sought, counter party		$ 93
Department of Energy | New York | Minimum
Commitments and Contingencies
Contingency liability					106
Department of Energy | New York | Maximum
Commitments and Contingencies
Contingency liability					146
Fund investment capital commitments
Commitments and Contingencies
Commitment					$ 19.1
Commitment period					7 years
Standby letters of credit
Commitments and Contingencies
Outstanding standby letters of credit					$ 487.5	$ 478.5
Contingency liability					492
Surety Bond
Commitments and Contingencies
Contingency liability					3,400
Collectibility of Receivables
Commitments and Contingencies
Unapproved change orders								$ 103
Collectibility of Receivables | New York
Commitments and Contingencies
Unapproved change orders							$ 60.4
Collectibility of Receivables | New York | Minimum
Commitments and Contingencies
Damages sought					148.5
Collectibility of Receivables | New York | Maximum
Commitments and Contingencies
Damages sought					329.4
Collectibility of Receivables | Montana
Commitments and Contingencies
Unapproved change orders					90
Damages sought					$ 144

Reportable Segments (Details)

Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Summarized financial information concerning the Company's reportable segments
Revenue	$ 3,213,658	$ 3,265,573	$ 6,480,374	$ 6,578,728
Gross profit	209,952	195,259	410,156	379,629
Equity in earnings of joint ventures	11,919	7,157	19,869	15,358
General and administrative expenses	(37,098)	(36,007)	(73,599)	(74,367)
Restructuring costs	(73,292)	(8,746)	(76,663)	(21,784)
Operating income	111,481	157,663	279,763	298,836
Segment assets	11,196,063		11,196,063		$ 11,733,954
Total
Summarized financial information concerning the Company's reportable segments
Revenue	3,213,700	3,265,500	6,480,400	6,578,700
Gross profit	210,000	195,200	410,200	379,600
Equity in earnings of joint ventures	12,000	7,200	19,900	15,400
General and administrative expenses	(37,200)	(36,000)	(73,600)	(74,400)
Restructuring costs	(73,300)	(8,800)	(76,700)	(21,800)
Operating income	$ 111,500	$ 157,600	$ 279,800	$ 298,800
Gross profit as a % of revenue	6.50%	6.00%	6.30%	5.80%
Corporate
Summarized financial information concerning the Company's reportable segments
General and administrative expenses	$ (34,600)	$ (34,500)	$ (68,000)	$ (71,000)
Restructuring costs	(73,300)	(8,800)	(76,700)	(21,800)
Operating income	(107,900)	(43,300)	(144,700)	(92,800)
Segment assets	1,147,100		1,147,100		1,390,900
Americas
Summarized financial information concerning the Company's reportable segments
Revenue	2,399,900	2,468,300	4,863,400	5,025,600
Gross profit	160,400	151,700	310,400	296,700
Equity in earnings of joint ventures	3,200	3,000	6,400	4,400
Operating income	$ 163,600	$ 154,700	$ 316,800	$ 301,100
Gross profit as a % of revenue	6.70%	6.10%	6.40%	5.90%
Segment assets	$ 7,134,900		$ 7,134,900		7,204,600
International
Summarized financial information concerning the Company's reportable segments
Revenue	813,300	$ 796,500	1,615,700	$ 1,552,100
Gross profit	49,100	42,800	98,500	81,900
Equity in earnings of joint ventures	5,700	3,000	9,300	6,000
Operating income	$ 54,800	$ 45,800	$ 107,800	$ 87,900
Gross profit as a % of revenue	6.00%	5.40%	6.10%	5.30%
Segment assets	$ 2,593,100		$ 2,593,100		2,764,500
AECOM Capital
Summarized financial information concerning the Company's reportable segments
Revenue	500	$ 700	1,300	$ 1,000
Gross profit	500	700	1,300	1,000
Equity in earnings of joint ventures	3,100	1,200	4,200	5,000
General and administrative expenses	(2,600)	(1,500)	(5,600)	(3,400)
Operating income	1,000	$ 400	(100)	$ 2,600
Segment assets	$ 236,600		$ 236,600		$ 234,600