AECOM (ACM) 10-K 13 Nov 18 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2018	Nov. 05, 2018	Mar. 31, 2018
Document and Entity Information
Entity Registrant Name	AECOM
Entity Central Index Key	868,857
Document Type	10-K
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 5.5
Entity Common Stock, Shares Outstanding		156,351,525
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 642,168	$ 665,871
Cash in consolidated joint ventures	244,565	136,491
Total cash and cash equivalents	886,733	802,362
Accounts receivable-net	5,468,821	5,127,743
Prepaid expenses and other current assets	585,152	696,718
Current assets held for sale	59,800
Income taxes receivable	126,816	55,399
TOTAL CURRENT ASSETS	7,127,322	6,682,222
PROPERTY AND EQUIPMENT-NET	614,062	621,357
DEFERRED TAX ASSETS-NET	159,396	171,331
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	310,661	364,223
GOODWILL	5,921,116	5,992,881
INTANGIBLE ASSETS-NET	319,892	415,096
OTHER NON-CURRENT ASSETS	228,682	149,846
TOTAL ASSETS	14,681,131	14,396,956
CURRENT LIABILITIES:
Short-term debt	8,353	1,221
Accounts payable	2,726,047	2,249,872
Accrued expenses and other current liabilities	2,267,046	2,245,519
Income taxes payable	39,802	38,176
Billings in excess of costs on uncompleted contracts	931,431	902,812
Current liabilities held for sale	22,300
Current portion of long-term debt	134,698	140,779
TOTAL CURRENT LIABILITIES	6,129,677	5,578,379
OTHER LONG-TERM LIABILITIES	329,457	322,199
DEFERRED TAX LIABILITY-NET	47,273	20,515
PENSION BENEFIT OBLIGATIONS	412,604	559,068
LONG-TERM DEBT	3,483,746	3,702,109
TOTAL LIABILITIES	10,402,757	10,182,270
COMMITMENTS AND CONTINGENCIES (Note 18)
AECOM STOCKHOLDERS' EQUITY:
Common stock-authorized, 300,000,000 shares of $0.01 par value as of September 30, 2018 and 2017; issued and outstanding 156,983,356 and 157,529,419 shares as of September 30, 2018 and 2017, respectively	1,570	1,575
Additional paid-in capital	3,846,392	3,733,572
Accumulated other comprehensive loss	(703,330)	(700,661)
Retained earnings	948,148	961,640
TOTAL AECOM STOCKHOLDERS' EQUITY	4,092,780	3,996,126
Noncontrolling interests	185,594	218,560
TOTAL STOCKHOLDERS' EQUITY	4,278,374	4,214,686
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 14,681,131	$ 14,396,956

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Sep. 30, 2017
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	156,983,356	157,529,419
Common stock, outstanding shares	156,983,356	157,529,419

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Operations
Revenue	$ 5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	$ 4,856,400	$ 4,561,500	$ 4,427,200	$ 4,358,300	$ 20,155,512	$ 18,203,402	$ 17,410,825
Cost of revenue	5,117,800	4,962,800	4,649,700	4,774,600	4,686,300	4,386,300	4,258,800	4,188,300	19,504,863	17,519,682	16,768,001
Gross profit	188,000	185,200	141,200	136,200	170,100	175,200	168,400	170,000	650,649	683,720	642,824
Equity in earnings of joint ventures	25,500	12,800	13,100	29,700	31,900	66,500	21,800	21,400	81,133	141,582	104,032
General and administrative expenses	(35,700)	(35,100)	(30,200)	(34,700)	(36,900)	(34,000)	(29,900)	(32,600)	(135,787)	(133,309)	(115,088)
Impairment on assets held for sale, including goodwill			(168,200)						(168,178)
Acquisition and integration expenses					(3,300)		(20,000)	(15,400)		(38,709)	(213,642)
(Loss) gain on disposal activities	(800)	(2,100)					600		(2,949)	572	(42,589)
Income from operations	177,000	160,800	(44,100)	131,200	161,800	207,700	140,900	143,400	424,868	653,856	375,537
Other income	2,600	2,700	12,500	2,300	2,500	2,100	1,300	800	20,135	6,636	8,180
Interest expense	(55,500)	(55,300)	(100,500)	(56,200)	(54,300)	(61,600)	(61,800)	(53,600)	(267,519)	(231,310)	(258,162)
Income before income tax (benefit) expense	124,100	108,200	(132,100)	77,300	110,000	148,200	80,400	90,600	177,484	429,182	125,555
Income tax (benefit) expense	18,700	33,100	(24,400)	(47,100)	6,200	12,100	(35,400)	24,800	(19,643)	7,706	(37,917)
Net income	105,400	75,100	(107,700)	124,400	103,800	136,100	115,800	65,800	197,127	421,476	163,472
Noncontrolling interests in income of consolidated subsidiaries, net of tax	(21,400)	(14,200)	(12,000)	(13,100)	(15,300)	(34,800)	(13,400)	(18,600)	(60,659)	(82,086)	(67,363)
Net income attributable to AECOM	$ 84,000	$ 60,900	$ (119,700)	$ 111,300	$ 88,500	$ 101,300	$ 102,400	$ 47,200	$ 136,468	$ 339,390	$ 96,109
Net income attributable to AECOM per share:
Basic (in dollars per share)	$ 0.53	$ 0.38	$ (0.75)	$ 0.70	$ 0.56	$ 0.65	$ 0.66	$ 0.31	$ 0.86	$ 2.18	$ 0.62
Diluted (in dollars per share)	$ 0.52	$ 0.37	$ (0.75)	$ 0.69	$ 0.55	$ 0.64	$ 0.65	$ 0.30	$ 0.84	$ 2.13	$ 0.62
Weighted average shares outstanding:
Basic (in shares)	158,600	160,400	159,500	157,900	157,500	155,800	155,400	154,300	159,101	155,728	154,772
Diluted (in shares)	161,800	163,200	159,500	161,800	161,100	158,800	158,700	158,000	162,261	159,135	156,073

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 105,400	$ 75,100	$ (107,700)	$ 124,400	$ 103,800	$ 136,100	$ 115,800	$ 65,800	$ 197,127	$ 421,476	$ 163,472
Other comprehensive (loss) income, net of tax:
Net unrealized gain on derivatives, net of tax									1,693	4,605	5,987
Foreign currency translation adjustments									(82,717)	65,389	(65,224)
Pension adjustments, net of tax									79,523	87,061	(164,911)
Other comprehensive (loss) income, net of tax									(1,501)	157,055	(224,148)
Comprehensive income, net of tax									195,626	578,531	(60,676)
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax									(61,827)	(82,220)	(65,697)
Comprehensive income (loss) attributable to AECOM, net of tax									$ 133,799	$ 496,311	$ (126,373)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total AECOM Stockholders' Equity	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Non-Controlling Interests	Total
BALANCE at Sep. 30, 2015	$ 3,407,748	$ 1,513	$ 3,518,999	$ (635,100)	$ 522,336	$ 223,195	$ 3,630,943
Increase (Decrease) in Stockholders' Equity
Net income	96,109				96,109	67,363	163,472
Other comprehensive income (loss)	(222,482)			(222,482)		(1,666)	(224,148)
Issuance of stock	28,086	21	28,065				28,086
Repurchases of stock	(25,892)	1	(25,893)				(25,892)
Proceeds from exercise of options	9,946	4	9,942				9,946
Stock based compensation	73,406		73,406				73,406
Other noncontrolling interests						(155)	(155)
Contributions from noncontrolling interests						2,006	2,006
Distributions to noncontrolling interests						(105,175)	(105,175)
BALANCE at Sep. 30, 2016	3,366,921	1,539	3,604,519	(857,582)	618,445	185,568	3,552,489
Increase (Decrease) in Stockholders' Equity
Net income	339,390				339,390	82,086	421,476
Cumulative effect of accounting standard adoption	3,805				3,805		3,805
Other comprehensive income (loss)	156,921			156,921		134	157,055
Issuance of stock	66,665	41	66,624				66,665
Repurchases of stock	(25,078)	(7)	(25,071)				(25,078)
Proceeds from exercise of options	4,878	2	4,876				4,878
Stock based compensation	83,774		83,774				83,774
Acquisition of noncontrolling interests	(1,150)		(1,150)				(1,150)
Other noncontrolling interests						9,808	9,808
Contributions from noncontrolling interests						2,282	2,282
Distributions to noncontrolling interests						(61,318)	(61,318)
BALANCE at Sep. 30, 2017	3,996,126	1,575	3,733,572	(700,661)	961,640	218,560	4,214,686
Increase (Decrease) in Stockholders' Equity
Net income	136,468				136,468	60,659	197,127
Other comprehensive income (loss)	(2,669)			(2,669)		1,168	(1,501)
Issuance of stock	68,111	42	68,069				68,111
Repurchases of stock under stock repurchase program	(150,000)	(40)			(149,960)		(150,000)
Repurchases of stock	(31,101)	(8)	(31,093)				(31,101)
Proceeds from exercise of options	2,750	1	2,749				2,750
Stock based compensation	73,095		73,095				73,095
Other noncontrolling interests						(5,012)	(5,012)
Contributions from noncontrolling interests						7,729	7,729
Distributions to noncontrolling interests						(97,510)	(97,510)
BALANCE at Sep. 30, 2018	$ 4,092,780	$ 1,570	$ 3,846,392	$ (703,330)	$ 948,148	$ 185,594	$ 4,278,374

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 197,127	$ 421,476	$ 163,472
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	267,570	278,631	398,730
Equity in earnings of unconsolidated joint ventures	(81,133)	(141,582)	(104,032)
Distribution of earnings from unconsolidated joint ventures	118,712	137,031	149,215
Non-cash stock compensation	73,095	83,774	73,406
Prepayment premium on redemption of unsecured senior notes	34,504
Impairment of assets held for sale, including goodwill	168,178
Foreign currency translation	(48,270)	6,007	(25,494)
Write-off of debt issuance costs	7,048		7,749
Deferred income tax expense (benefit)	36,746	(49,856)	(110,122)
Pension curtailment and settlement gains			(7,818)
(Loss) gain on disposal activities	2,949	(572)	42,589
Other	(472)	(15,062)	2,430
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(381,787)	(432,769)	337,291
Prepaid expenses and other assets	(75,980)	(21,780)	(16,257)
Accounts payable	474,950	292,496	16,616
Accrued expenses and other current liabilities	16,848	(53,126)	(154,096)
Billings in excess of costs on uncompleted contracts	2,729	234,116	(22,949)
Other long-term liabilities	(39,887)	(68,714)	53,411
Income taxes payable	1,626	26,584	10,014
Net cash provided by operating activities	774,553	696,654	814,155
CASH FLOWS FROM INVESTING ACTIVITIES:
Payment for business acquisitions, net of cash acquired		(103,075)	(5,534)
Proceeds from purchase price adjustment to business acquisition	2,203
Cash acquired from consolidation of joint venture	7,630
Proceeds from disposal of businesses, net of cash disposed	19,537	2,200	39,699
Investment in unconsolidated joint ventures	(91,030)	(59,684)	(76,707)
Return of investment in unconsolidated joint ventures	105,769	35,407	5,160
Proceeds from sales of investments	7,174	900	11,745
Payments for purchase of investments	(23,492)		(214)
Proceeds from disposal of property and equipment	26,401	7,895	54,622
Payments for capital expenditures	(113,279)	(86,354)	(191,386)
Net cash used in investing activities	(59,087)	(202,711)	(162,615)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	8,529,014	5,953,249	4,706,225
Repayments of borrowings under credit agreements	(8,040,262)	(7,071,602)	(5,199,961)
Issuance of unsecured senior notes		1,000,000
Redemption of unsecured senior notes	(800,000)	(179,208)
Prepayment premium on redemption of unsecured senior notes	(34,504)
Cash paid for debt issuance costs	(12,181)	(13,041)	(10,447)
Proceeds from issuance of common stock	35,233	30,093	28,192
Proceeds from exercise of stock options	2,750	4,878	9,946
Payments to repurchase common stock under the share repurchase program	(150,000)
Payments to repurchase common stock	(29,466)	(25,078)	(25,892)
Net distributions to noncontrolling interests	(89,781)	(59,036)	(103,169)
Other financing activities	(35,671)	(26,745)	(42,873)
Net cash used in financing activities	(624,868)	(386,490)	(637,979)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(6,227)	2,764	(5,309)
NET INCREASE IN CASH AND CASH EQUIVALENTS	84,371	110,217	8,252
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	802,362	692,145	683,893
CASH AND CASH EQUIVALENTS AT END OF YEAR	886,733	802,362	692,145
SUPPLEMENTAL CASH FLOW INFORMATION:
Common stock issued in acquisitions		36,611
Debt assumed from acquisitions		31,353	1,805
Interest paid	271,842	226,090	216,125
Net income taxes paid	$ 40,589	$ 11,540	$ 13,109

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Sep. 30, 2018
Significant Accounting Policies
Significant Accounting Policies	1. Significant Accounting Policies Organization —AECOM and its consolidated subsidiaries design, build, finance and operate infrastructure assets for governments, businesses and organizations around the world. The Company provides planning, consulting, architectural and engineering design services to commercial and government clients worldwide in major end markets such as transportation, facilities, environmental, energy, water and government. The Company also provides construction services, including building construction and energy, infrastructure and industrial construction, primarily in the Americas. In addition, the Company provides program and facilities management and maintenance, training, logistics, consulting, technical assistance, and systems integration and information technology services, primarily for agencies of the U.S. government and also for national governments around the world. Fiscal Year —The Company reports results of operations based on 52 or 53-week periods ending on the Friday nearest September 30. For clarity of presentation, all periods are presented as if the year ended on September 30. Fiscal years 2018, 2017 and 2016 each contained 52 weeks and ended on September 28, September 29, and September 30, respectively. Use of Estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The more significant estimates affecting amounts reported in the consolidated financial statements relate to revenues under long‑term contracts and self‑insurance accruals. Actual results could differ from those estimates. Principles of Consolidation and Presentation —The consolidated financial statements include the accounts of all majority‑owned subsidiaries and joint ventures in which the Company is the primary beneficiary. All inter‑company accounts have been eliminated in consolidation. Also see Note 6 regarding joint ventures and variable interest entities. Revenue Recognition —The Company generally utilizes a cost-to-cost approach in applying the percentage-of-completion method of revenue recognition. Under this approach, revenue is earned in proportion to total costs incurred, divided by total costs expected to be incurred. 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, engineering progress, material quantities, the achievement of milestones, penalty provisions, labor productivity and cost estimates made at the balance sheet date. Due to uncertainties inherent in the estimation process, actual completion costs may vary from estimates. If estimated total costs on contracts indicate a loss, the Company recognizes that estimated loss within cost of revenues in the period the estimated loss first becomes known. Liabilities recorded related to accrued contract losses were not material as of September 30, 2018 and 2017. 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 industry practice and GAAP, are included in the Company’s revenue and cost of revenue. Because subcontractor services and other direct costs can change significantly from project to project and period to period, changes in revenue may not be indicative of business trends. These subcontractor and other direct costs for the years ended September 30, 2018, 2017 and 2016 were $10.7 billion, $9.2 billion and $8.4 billion, respectively. Cost-Reimbursable Contracts Cost-reimbursable contracts consists of two similar contract types: (1) cost-plus contracts and (2) time-and-materials price contracts. Cost‑Plus Contracts. The Company enters into two major types of cost‑plus contracts: Cost‑Plus Fixed Fee. Under cost‑plus fixed fee contracts, the Company charges clients for its costs, including both direct and indirect costs, plus a fixed negotiated fee. The total estimated cost plus the fixed negotiated fee represents the total contract value. The Company recognizes revenue based on the actual labor and other direct costs incurred, plus the portion of the fixed fee it has earned to date. Cost‑Plus Fixed Rate. Under the Company’s cost‑plus fixed rate contracts, the Company charges clients for its direct and indirect costs based upon a negotiated rate. The Company recognizes revenue based on the actual total costs it has expended and the applicable fixed rate. Certain cost‑plus contracts provide for award fees or a penalty based on performance criteria in lieu of a fixed fee or fixed rate. Other contracts include a base fee component plus a performance‑based award fee. In addition, the Company may share award fees with subcontractors. The Company records accruals for fee‑sharing as fees are earned. The Company generally recognizes revenue to the extent of costs actually incurred plus a proportionate amount of the fee expected to be earned. The Company takes the award fee or penalty on contracts into consideration when estimating revenue and profit rates, and it records revenue related to the award fees when there is sufficient information to assess anticipated contract performance. On contracts that represent higher than normal risk or technical difficulty, the Company may defer all award fees until an award fee letter is received. Once an award fee letter is received, the estimated or accrued fees are adjusted to the actual award amount. Certain cost‑plus contracts provide for incentive fees based on performance against contractual milestones. The amount of the incentive fees varies, depending on whether the Company achieves above, at, or below target results. The Company originally recognizes revenue on these contracts based upon expected results. These estimates are revised when necessary based upon additional information that becomes available as the contract progresses. Time‑and‑Materials Price Contracts Time‑and‑Materials Price Contracts. Under time‑and‑materials 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 its actual out‑of‑pocket costs of materials and other direct incidental expenditures that it incurs in connection with its performance under the contract. Profit margins on time‑and‑materials contracts fluctuate based on actual labor and overhead costs that it directly charges or allocates to contracts compared to negotiated billing rates. Many of the Company’s time‑and‑materials contracts are subject to maximum contract values and, accordingly, revenue relating to these contracts is recognized as if these contracts were a fixed‑price contract. Guaranteed Maximum Price Contracts Guaranteed Maximum Price. Guaranteed maximum price contracts (GMP) are common for design-build and commercial and residential projects. GMP contracts share many of the same contract provisions as cost-plus and fixed-price contracts. A contractor performing work pursuant to a cost-plus, GMP or fixed-price contract will all enter into trade contracts directly. Both cost-plus and GMP contracts generally include an agreed lump sum or percentage fee which is called out and separately identified and the contracts are considered ‘open’ book providing the owner with full disclosure of the project costs. A fixed-price contract provides the owner with a single lump sum amount without specifically identifying the breakdown of fee or costs and is typically ‘closed’ book thereby providing the owner with little detail as to the project costs. In a GMP contract, unlike the cost-plus contract, the Company provides the owner with a guaranteed price for the overall construction (adjusted for change orders issued by the owner) and with a schedule which includes a completion date for the project. In addition, cost overruns in a GMP contract would generally be the Company’s responsibility and in the event the Company’s actions or inactions result in delays to the project, the Company may be responsible to the owner for costs associated with such delay. For many of the Company’s commercial and residential GMP contracts, the final price is generally not established until the Company have awarded a substantial percentage of the trade contracts and it has negotiated additional contractual limitations, such as mutual waivers of consequential damages as well as aggregate caps on liabilities and liquidated damages. Fixed‑Price Contracts Fixed‑Price. Fixed‑price contracting is the predominant contracting method outside of the United States. There are typically two types of fixed‑price contracts. The first and more common type, lump‑sum, involves performing all of the work under the contract for a specified lump‑sum fee. Lump‑sum contracts are typically subject to price adjustments if the scope of the project changes or unforeseen conditions arise. The second type, fixed‑unit price, involves performing an estimated 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. The Company recognizes revenue on fixed‑price contracts using the percentage‑of‑completion method described above. Prior to completion, recognized profit margins on any fixed‑price contract depend on the accuracy of the Company’s estimates and will increase to the extent that its actual costs are below the estimated amounts. Conversely, if the Company’s costs exceed these estimates, its profit margins will decrease and the Company may realize a loss on a project. The Company recognizes anticipated losses on contracts in the period in which they become evident. During the years ended September 30, 2018, 2017 and 2016, the types of contracts comprising the Company’s revenue were as follows: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 Cost reimbursable 47 % 48 % 53 % Guaranteed maximum price 23 % 23 % 15 % Fixed price 30 % 29 % 32 % Cost-reimbursable contracts include cost-plus and time-and-materials price contracts. Contract Claims —Claims are amounts in excess of the agreed contract price (or amounts not included in the original contract price) that the Company seeks to collect from customers or others for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price or other causes of unanticipated additional costs. The Company records contract revenue related to claims only if it is probable that the claim will result in additional contract revenue and if the amount can be reliably estimated. In such cases, the Company records revenue only to the extent that contract costs relating to the claim have been incurred. Government Contract Matters —The Company’s federal government and certain state and local agency contracts are subject to, among other regulations, regulations issued under the Federal Acquisition Regulations (FAR). These regulations can limit the recovery of certain specified indirect costs on contracts and subjects the Company to ongoing multiple audits by government agencies such as the Defense Contract Audit Agency (DCAA). In addition, most of the Company’s federal and state and local contracts are subject to termination at the discretion of the client. Audits by the DCAA and other agencies consist of reviews of the Company’s overhead rates, operating systems and cost proposals to ensure that the Company accounted for such costs in accordance with the Cost Accounting Standards of the FAR (CAS). If the DCAA determines the Company has not accounted for such costs consistent with CAS, the DCAA may disallow these costs. There can be no assurance that audits by the DCAA or other governmental agencies will not result in material cost disallowances in the future. Cash and Cash Equivalents —The Company’s cash equivalents include highly liquid investments which have an initial maturity of three months or less. Allowance for Doubtful Accounts —The Company records its accounts receivable net of an allowance for doubtful accounts. This allowance for doubtful accounts is estimated based on management’s evaluation of the contracts involved and the financial condition of its clients. The factors the Company considers in its contract evaluations include, but are not limited to: · Client type—federal or state and local government or commercial client; · Historical contract performance; · Historical collection and delinquency trends; · Client credit worthiness; and · General economic conditions. Derivative Financial Instruments —The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. For derivative instruments that hedge the exposure to variability in expected future cash flows that are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income in stockholders’ equity and reclassified into income in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument, if any, is recognized in current income. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions. The net gain or loss on the effective portion of a derivative instrument that is designated as an economic hedge of the foreign currency translation exposure generated by the re‑measurement of certain assets and liabilities denominated in a non‑functional currency in a foreign operation is reported in the same manner as a foreign currency translation adjustment. Accordingly, any gains or losses related to these derivative instruments are recognized in current income. Derivatives that do not qualify as hedges are adjusted to fair value through current income. Fair Value of Financial Instruments —The Company determines the fair values of its financial instruments, including short‑term investments, debt instruments and derivative instruments, and pension and post‑retirement plan assets based on inputs or assumptions that market participants would use in pricing an asset or a liability. The Company categorizes its instruments using a valuation hierarchy for disclosure of the inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; Level 3 inputs are unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. The classification of a financial asset or liability within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturities of these instruments. The carrying amount of the revolving credit facility approximates fair value because the interest rates are based upon variable reference rates. The Company’s fair value measurement methods may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Although the Company believes its valuation methods are appropriate and consistent with those used by other market participants, the use of different methodologies or assumptions to determine fair value could result in a different fair value measurement at the reporting date. Property and Equipment —Property and equipment are recorded at cost and are depreciated over their estimated useful lives using the straight‑line method. Expenditures for maintenance and repairs are expensed as incurred. Typically, estimated useful lives range from ten to forty-five years for buildings, three to ten years for furniture and fixtures and three to twelve years for computer systems and equipment. Leasehold improvements are amortized on a straight‑line basis over the shorter of their estimated useful lives or the remaining terms of the underlying lease agreement. Long-lived Assets —Long-lived assets to be held and used are reviewed for impairment whenever events or circumstances indicate that the assets may not be recoverable. The carrying amount of an asset to be held and used is not recoverable if it exceeds the sum of the undiscounted cash flows expected from the use and eventual disposition of the asset. For assets to be held and used, impairment losses are recognized based upon the excess of the asset’s carrying amount over the fair value of the asset. For long-lived assets to be disposed, impairment losses are recognized at the lower of the carrying amount or fair value less cost to sell. Goodwill and Acquired Intangible Assets —Goodwill represents the excess of amounts paid over the fair value of net assets acquired from an acquisition. In order to determine the amount of goodwill resulting from an acquisition, the Company performs an assessment to determine the value of the acquired company’s tangible and identifiable intangible assets and liabilities. In its assessment, the Company determines whether identifiable intangible assets exist, which typically include backlog and customer relationships. Intangible assets are amortized over the period in which the contractual or economic benefits of the intangible assets are expected to be realized. The Company tests goodwill for impairment annually for each reporting unit in the fourth quarter of the fiscal year and between annual tests, if events occur or circumstances change which suggest that goodwill should be evaluated. Such events or circumstances include significant changes in legal factors and business climate, recent losses at a reporting unit, and industry trends, among other factors. A reporting unit is defined as an operating segment or one level below an operating segment. The Company’s impairment tests are performed at the operating segment level as they represent the Company’s reporting units. During the impairment test, the Company estimates the fair value of the reporting unit using income and market approaches, and compares that amount to the carrying value of that reporting unit. In the event the fair value of the reporting unit is determined to be less than the carrying value, goodwill is impaired, and an impairment loss is recognized equal to the excess, limited to the total amount of goodwill allocated to the reporting unit. See also Note 3. Pension Plans —The Company has certain defined benefit pension plans. The Company calculates the market‑related value of assets, which is used to determine the return‑on‑assets component of annual pension expense and the cumulative net unrecognized gain or loss subject to amortization. This calculation reflects the Company’s anticipated long‑term rate of return and amortization of the difference between the actual return (including capital, dividends, and interest) and the expected return over a five-year period. Cumulative net unrecognized gains or losses that exceed 10% of the greater of the projected benefit obligation or the market related value of plan assets are subject to amortization. Insurance Reserves —The Company maintains insurance for certain insurable business risks. Insurance coverage contains various retention and deductible amounts for which the Company accrues a liability based upon reported claims and an actuarially determined estimated liability for certain claims incurred but not reported. It is generally the Company’s policy not to accrue for any potential legal expense to be incurred in defending the Company’s position. The Company believes that its accruals for estimated liabilities associated with professional and other liabilities are sufficient and any excess liability beyond the accrual is not expected to have a material adverse effect on the Company’s results of operations or financial position. Foreign Currency Translation —The Company’s functional currency is generally the U.S. dollar, except for foreign operations where the functional currency is generally the local currency. Results of operations for foreign entities are translated to U.S. dollars using the average exchange rates during the period. Assets and liabilities for foreign entities are translated using the exchange rates in effect as of the date of the balance sheet. Resulting translation adjustments are recorded as a foreign currency translation adjustment into other accumulated comprehensive income/(loss) in stockholders’ equity. The Company uses foreign currency forward contracts from time to time to mitigate foreign currency risk. The Company limits exposure to foreign currency fluctuations in most of its contracts through provisions that require client payments in currencies corresponding to the currency in which costs are incurred. As a result of this natural hedge, the Company generally does not need to hedge foreign currency cash flows for contract work performed. Noncontrolling Interests —Noncontrolling interests represent the equity investments of the minority owners in the Company’s joint ventures and other subsidiary entities that the Company consolidates in its financial statements. Income Taxes— The Company files a consolidated U.S. federal corporate income tax return and combined / consolidated state tax returns and separate company state tax returns. The Company accounts for certain income and expense items differently for financial reporting and income tax purposes. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. In determining the need for a valuation allowance, management reviews both positive and negative evidence, including the nature, frequency, and severity of cumulative financial reporting losses in recent years, the future reversal of existing temporary differences, predictability of future taxable income exclusive of reversing temporary differences of the character necessary to realize the asset, relevant carryforward periods, taxable income in carry-back years if carry-back is permitted under tax law, and prudent and feasible tax planning strategies that would be implemented, if necessary, to protect against the loss of the deferred tax asset that would otherwise expire. Based upon management’s assessment of all available evidence, the Company has concluded that it is more likely than not that the deferred tax assets, net of valuation allowance, will be realized.

New Accounting Pronouncements a

New Accounting Pronouncements and Changes in Accounting	12 Months Ended
	Sep. 30, 2018
New Accounting Pronouncements and Changes in Accounting
New Accounting Pronouncements and Changes in Accounting	2. New Accounting Pronouncements and Changes in Accounting In May 2014, the Financial Accounting Standards Board (FASB) issued new accounting guidance which amended the existing accounting standards for revenue recognition. The new accounting guidance establishes principles for recognizing revenue upon the transfer of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. The amendments may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of initial application. The Company’s evaluation of the impact of the new guidance on its consolidated financial statements, including the expected impact on its business processes, systems, and controls, and potential differences in the timing or method of revenue recognition for its contracts, is substantially complete. The Company adopted the new standard on October 1, 2018, using the modified retrospective method, which requires recognizing the net cumulative effects of adoption as an adjustment to retained earnings. Based on its current evaluation, the Company believes the impacts of adoption to be primarily related to combining contracts that were previously segmented into a single performance obligation. However, the Company does not anticipate that adoption will have a material impact on its financial results and estimates the adjustment to retained earnings due to adoption will not be material. In February 2016, the FASB issued new accounting guidance which changes accounting requirements for leases. The new guidance requires lessees to recognize the assets and liabilities arising from all leases, including those classified as operating leases under previous accounting guidance, on the balance sheet. It also requires disclosure of key information about leasing arrangements to increase transparency and comparability among organizations. The new guidance will be effective for the Company’s fiscal year beginning October 1, 2019 with early adoption permitted. The new guidance must be adopted using a modified retrospective transition approach and provides for some practical expedients. The Company is currently evaluating the impact that the new guidance will have on its consolidated financial statements. In February 2016, the FASB issued new accounting guidance to clarify that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument under previous guidance does not, in and of itself, require redesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted the new guidance on October 1, 2017; and the adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In March 2016, the FASB issued new accounting guidance which eliminates the requirement to apply the equity method of accounting retrospectively when a reporting entity obtains significant influence over a previously held investment. The Company adopted the new guidance on October 1, 2017; and the adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In June 2016, the FASB issued a new credit loss standard that changes the impairment model for most financial assets and some other instruments. The new guidance will replace the current “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 guidance will be effective for the Company’s fiscal year starting October 1, 2020. The Company is currently evaluating the impact that the new guidance will have on its consolidated financial statements. In August 2016, the FASB issued new accounting guidance clarifying how entities should classify cash receipts and cash payments on the statement of cash flows. The new guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. The new guidance will be effective for the Company in its fiscal year beginning October 1, 2018 and early adoption is permitted. The Company does not expect that the new guidance will have a material impact on its consolidated statement of cash flows. In October 2016, the FASB issued additional guidance on how a single decision maker considers its indirect interests when performing the primary beneficiary analysis under the variable interest model. Under the new guidance, the single decision maker will consider its indirect interests on a proportionate basis. The Company adopted the new guidance on October 1, 2017 and the adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In January 2017, the FASB issued new accounting guidance that changes the definition of a business to assist companies with evaluating when a set of transferred assets and activities is a business. This guidance requires the buyer to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of assets. The Company elected to adopt this guidance on July 1, 2018, and the adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In January 2017, the FASB issued new accounting guidance to simplify the test for goodwill impairment. This guidance eliminates step two from the goodwill impairment test. Under the new guidance, an entity should recognize an impairment charge for the amount by which the carrying amount of a reporting unit exceeds its fair value. However, the loss recognized should not exceed the total amount of goodwill allocated to the reporting unit. The Company early adopted the new guidance on January 1, 2018 and the adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In March 2017, the FASB issued new guidance on how employers that sponsor defined benefit pension or other postretirement benefit plans present the net periodic benefit cost in the income statement. Under the new guidance, employers will present the service cost component of net periodic benefit cost in the same income statement line items as other employee compensation costs. The new guidance was effective for the Company on October 1, 2018. Adoption of the new guidance did not have a material impact on the Company’s consolidated financial statements. In August 2017, the FASB issued new accounting guidance on derivatives and hedging. This guidance better aligns an entity’s risk management activities and financial reporting for hedging relationships through change to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedging results. The Company early adopted the guidance on January 1, 2018 and the adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In October 2017, the FASB issued additional guidance regarding accounting for intercompany transfers of assets other than inventory. The new guidance will require companies to account for the income tax consequences of intercompany transfers of assets other than inventory in the period the transfer occurs. The Company adopted this guidance on October 1, 2018, and estimates the adoption of this guidance will not have a material impact on its consolidated financial statements.

Business Acquisitions, Goodwill

Business Acquisitions, Goodwill and Intangible Assets	12 Months Ended
	Sep. 30, 2018
Business Acquisitions, Goodwill and Intangible Assets
Business Acquisitions, Goodwill and Intangible Assets	3. Business Acquisitions, Goodwill, and Intangible Assets The Company completed one acquisition during the year ended September 30, 2018 and two acquisitions during the year ended September 30, 2017 for a total consideration of $5.6 million and $164.4 million, respectively. The business combinations did not meet the quantitative thresholds to require separate disclosures based on the Company’s consolidated net assets, investments and net income. The acquisitions were accounted for under the purchase method of accounting. As such, the purchase considerations were allocated to acquired tangible and intangible assets and liabilities based upon their fair values. The determination of fair values of assets and liabilities acquired requires the Company to make estimates and use valuation techniques when market value is not readily available. Transaction costs associated with business acquisitions are expensed as they are incurred. On October 17, 2014, the Company completed the acquisition of the U.S. headquartered URS Corporation (URS), an international provider of engineering, construction, and technical services.In connection therewith, the Company acquired backlog and customer relationship intangible assets valued at $973.8 million representing the fair value of existing contracts and the underlying customer relationships that have lives ranging from 1 to 11 years (weighted average lives of approximately 3 years) in connection with the URS acquisition. Acquired accrued expenses and other current liabilities include URS project liabilities and approximately $240 million related to estimated URS legal settlements and uninsured legal damages; see Note 18, Commitments and Contingencies, including legal matters related to former URS affiliates. Amortization of intangible assets relating to URS, included in cost of revenue, was $68.4 million and $83.6 million during the twelve months ended September 30, 2018 and 2017, respectively. Additionally, included in equity in earnings of joint ventures and noncontrolling interests was intangible amortization expense of $7.1 million and $(8.5) million, respectively, during the twelve months ended September 30, 2018 and $9.4 million and $(8.5) million, respectively, during the twelve months ended September 30, 2017 related to joint venture fair value adjustments. Billings in excess of costs on uncompleted contracts includes a margin fair value liability associated with long-term contracts acquired. This margin fair value liability was $20.6 million at September 30, 2018 and $8.6 million at September 30, 2017, and is recognized as revenue on a percentage-of-completion basis as the applicable projects progress. Income from operations related to the margin fair value liability recognized during the twelve months ended September 30, 2018 and 2017 was $21.1 million and $6.3 million, respectively. Acquisition and integration expenses, relating to business acquisitions, in the accompanying consolidated statements of operations are comprised of the following (in millions): Fiscal Year Ended Sept 30, 2017 Severance and personnel costs $ 32.0 Professional services, real estate-related, and other expenses 6.7 Total $ 38.7 Included in severance and personnel costs for the twelve months ended September 30, 2017 was $9.8 million of severance expense, which was substantially all paid as of September 30, 2018. All acquisition and integration expenses are classified within the Corporate segment, as presented in Note 19. Acquisition and integration expenses associated with the URS acquisition are complete. In the second quarter of fiscal 2018, management approved a plan to sell non-core oil and gas assets in North America, included in the Company’s Construction Services segment (the Disposal Group). The Company classified the related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet. In the third quarter of fiscal 2018, the Company sold a portion of the assets in the Disposal Group and recognized a $2.1 million loss on disposal. The remaining unsold portion of the Disposal Group remains classified as held for sale. The Company recorded losses related to the remeasurement of the Disposal Group based on estimated fair value less costs to sell resulting in total asset impairments of $168.2 million, recorded in Impairment of assets held for sale, including goodwill. Fair value was estimated using Level 3 inputs, such as forecasted cash flows, and Level 2 inputs, including bid prices from potential buyers. In connection with the classification of the Disposal Group as held for sale, the Company tested the amount of goodwill and other intangible assets allocated to the Disposal Group for impairment. The Company recorded an impairment of goodwill during the year ended September 30, 2018 of $125.4 million and an impairment of intangible and other noncurrent assets of $42.8 million. As of September 30, 2018, current assets held for sale were primarily comprised of accounts receivable of $44.5 million and property, plant and equipment of $14.9 million. As of September 30, 2018, current liabilities held for sale were primarily comprised of accounts payable of $22.3 million. The Company expects to complete the sale of the remaining Disposal Group assets within the next twelve months. Loss on disposal activities of $42.6 million in the accompanying statements of operations for the twelve months ended September 30, 2016 included losses on the disposition of non-core energy related businesses, equipment and other assets acquired with URS and reported within the Construction Services segment. Net assets related to the loss on disposal activities were $112.8 million at the date of disposal. The changes in the carrying value of goodwill by reportable segment for the fiscal years ended September 30, 2018 and 2017 were as follows: Fiscal Year 2018 Measurement Foreign September 30, Period Exchange September 30, 2017 Adjustment Impairment Impact 2018 (in millions) Design and Consulting Services $ 3,218.9 $ — $ — $ (29.7) $ 3,189.2 Construction Services 1,049.9 91.0 (125.4) (6.6) 1,008.9 Management Services 1,724.1 — — (1.1) 1,723.0 Total $ 5,992.9 $ 91.0 $ (125.4) $ (37.4) $ 5,921.1 Fiscal Year 2017 Foreign September 30, Exchange September 30, 2016 Acquisition Disposed Impact 2017 (in millions) Design and Consulting Services $ 3,198.2 $ 3.8 $ (1.8) $ 18.7 $ 3,218.9 Construction Services 915.2 123.3 — 11.4 1,049.9 Management Services 1,710.4 — — 13.7 1,724.1 Total $ 5,823.8 $ 127.1 $ (1.8) $ 43.8 $ 5,992.9 The gross amounts and accumulated amortization of the Company’s acquired identifiable intangible assets with finite useful lives as of September 30, 2018 and 2017, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows: September 30, 2018 September 30, 2017 Amortization Gross Accumulated Intangible Gross Accumulated Intangible Period Amount Amortization Assets, Net Amount Amortization Assets, Net (years) (in millions) Backlog and customer relationships $ 1,285.1 $ (966.0) $ 319.1 $ 1,283.6 $ (870.2) $ 413.4 1 - 11 Trademark / tradename 18.3 (17.5) 0.8 18.3 (16.6) 1.7 0.3 - 2 Total $ 1,303.4 $ (983.5) $ 319.9 $ 1,301.9 $ (886.8) $ 415.1 Amortization expense of acquired intangible assets included within cost of revenue was $96.7 million, $102.7 million, and $202.4 million for the years ended September 30, 2018, 2017 and 2016, respectively. The following table presents estimated amortization expense of existing intangible assets for the succeeding years: Fiscal Year (in millions) 2019 $ 83.7 2020 69.8 2021 56.8 2022 44.0 2023 39.5 Thereafter 26.1 Total $ 319.9

Accounts Receivable - Net

Accounts Receivable - Net	12 Months Ended
	Sep. 30, 2018
Accounts Receivable - Net
Accounts Receivable - Net	4. Accounts Receivable-Net Net accounts receivable consisted of the following: Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Billed $ 2,697.7 $ 2,317.8 Unbilled 2,161.0 2,293.5 Contract retentions 661.7 568.6 Total accounts receivable—gross 5,520.4 5,179.9 Allowance for doubtful accounts (51.6) (52.2) Total accounts receivable—net $ 5,468.8 $ 5,127.7 Billed accounts receivable represent amounts billed to clients that have yet to be collected. Unbilled accounts receivable represents the contract revenue recognized but not yet billed pursuant to contract terms or accounts billed after the period end. Substantially all unbilled receivables as of September 30, 2018 and 2017 are expected to be billed and collected within twelve months, except for claims. Significant claims recorded in unbilled receivables and other non-current assets were $266.0 million and $227.7 million as of September 30, 2018 and 2017, respectively, and included an amount related to the DOE Deactivation, Demolition, and Removal Project discussed further in Note 18. Contract retentions represent amounts invoiced to clients where payments have been withheld pending the completion of certain milestones, other contractual conditions or upon the completion of the project. These retention agreements vary from project to project and could be outstanding for several months or years. Allowances for doubtful accounts have been determined through specific identification of amounts considered to be uncollectible and potential write‑offs, plus a non‑specific allowance for other amounts for which some potential loss has been determined to be probable based on current and past experience. Other than the U.S. government, no single client accounted for more than 10% of the Company’s outstanding receivables at September 30, 2018 and 2017. The Company sold trade receivables to financial institutions, of which $334.2 million and $325.2 million were outstanding as of September 30, 2018 and 2017, 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.

Property and Equipment

Property and Equipment	12 Months Ended
	Sep. 30, 2018
Property and Equipment
Property and Equipment	5. Property and Equipment Property and equipment, at cost, consists of the following: Fiscal Year Ended September 30, September 30, Useful Lives 2018 2017 (years) (in millions) Building and land $ 75.2 $ 63.6 10 - 45 Leasehold improvements 399.2 404.6 1 - 20 Computer systems and equipment 741.2 694.6 3 - 12 Furniture and fixtures 132.5 135.9 3 - 10 Total 1,348.1 1,298.7 Accumulated depreciation and amortization (734.0) (677.3) Property and equipment, net $ 614.1 $ 621.4 Depreciation expense for the fiscal years ended September 30, 2018, 2017 and 2016 were $158.5 million, $157.1 million, and $171.7 million, respectively. Depreciation is calculated using primarily the straight‑line method over the estimated useful lives of the assets, or in the case of leasehold improvements and capitalized leases, the lesser of the remaining term of the lease or its estimated useful life.

Joint Ventures and Variable Int

Joint Ventures and Variable Interest Entities	12 Months Ended
	Sep. 30, 2018
Joint Ventures and Variable Interest Entities
Joint Ventures and Variable Interest Entities	6. Joint Ventures and Variable Interest Entities The Company’s joint ventures provide architecture, engineering, program management, construction management, operations and maintenance services and invests in real estate, public-private partnership (P3) and infrastructure 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, 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 discussed in Note 18. Summary of financial information of the consolidated joint ventures is as follows: September 30, September 30, 2018 2017 (in millions) Current assets $ 1,013.7 $ 832.1 Non-current assets 192.7 188.8 Total assets $ 1,206.4 $ 1,020.9 Current liabilities $ 724.2 $ 524.9 Non-current liabilities 12.7 12.4 Total liabilities 736.9 537.3 Total AECOM equity 284.2 274.7 Noncontrolling interests 185.3 208.9 Total owners’ equity 469.5 483.6 Total liabilities and owners’ equity $ 1,206.4 $ 1,020.9 Total revenue of the consolidated joint ventures was $2,525.0 million, $1,933.5 million, and $1,935.2 million for the years ended September 30, 2018, 2017 and 2016, 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 financial information of the unconsolidated joint ventures, as derived from their unaudited financial statements, is as follows: September 30, September 30, 2018 2017 (in millions) Current assets $ 1,903.3 $ 1,912.2 Non-current assets 938.3 749.8 Total assets $ 2,841.6 $ 2,662.0 Current liabilities $ 1,658.5 $ 1,570.2 Non-current liabilities 224.3 185.1 Total liabilities 1,882.8 1,755.3 Joint ventures’ equity 958.8 906.7 Total liabilities and joint ventures’ equity $ 2,841.6 $ 2,662.0 AECOM’s investment in joint ventures $ 310.7 $ 364.2 Twelve Months Ended September 30, September 30, 2018 2017 (in millions) Revenue $ 5,571.9 $ 5,561.8 Cost of revenue 5,325.4 5,305.5 Gross profit $ 246.5 $ 256.3 Net income $ 238.6 $ 244.8 Summary of AECOM’s equity in earnings of unconsolidated joint ventures is as follows: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 (in millions) Pass through joint ventures $ 34.1 $ 36.6 $ 21.9 Other joint ventures 47.0 105.0 82.1 Total $ 81.1 $ 141.6 $ 104.0 Included in equity of earnings above, the Company recorded a gain of $52 million from a sale of its 50% equity interest in Provost Square I LLC, an unconsolidated joint venture that invested in a real estate development in New Jersey, in fiscal year ended September 30, 2017.

Pension Benefit Obligations

Pension Benefit Obligations	12 Months Ended
	Sep. 30, 2018
Pension Benefit Obligations
Pension Benefit Obligations	7. 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 following tables provide reconciliations of the changes in the U.S. and international plans’ benefit obligations, reconciliations of the changes in the fair value of assets for the last three years ended September 30, and reconciliations of the funded status as of September 30 of each year. Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Change in benefit obligation: Benefit obligation at beginning of year $ 683.0 $ 1,333.5 $ 720.0 $ 1,406.2 $ 718.2 $ 1,239.2 Service cost 4.9 1.1 4.3 1.3 4.3 1.0 Participant contributions 0.2 0.4 0.1 0.4 0.1 0.5 Interest cost 20.7 32.0 19.2 28.3 22.0 39.2 Benefits and expenses paid (37.8) (53.7) (37.9) (48.3) (37.4) (41.9) Actuarial (gain) loss (38.5) (87.7) (22.7) (98.6) 52.3 377.1 Plan settlements — (3.0) — — (32.9) (0.7) Plan amendments 0.6 — — — 0.2 — Plan curtailments — (0.1) — — (6.8) — Foreign currency translation (gain) loss — (33.7) — 44.2 — (208.2) Benefit obligation at end of year $ 633.1 $ 1,188.8 $ 683.0 $ 1,333.5 $ 720.0 $ 1,406.2 Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Change in plan assets Fair value of plan assets at beginning of year $ 470.4 $ 993.1 $ 456.9 $ 973.2 $ 459.0 $ 925.8 Actual return on plan assets 11.1 29.3 39.0 9.6 49.6 215.9 Employer contributions 11.6 27.8 12.3 25.8 18.5 20.2 Participant contributions 0.2 0.4 0.1 0.4 0.1 0.5 Benefits and expenses paid (37.8) (53.7) (37.9) (48.3) (37.4) (41.9) Plan settlements — (3.0) — — (32.9) (0.7) Foreign currency translation gain (loss) — (28.0) — 32.4 — (146.6) Fair value of plan assets at end of year $ 455.5 $ 965.9 $ 470.4 $ 993.1 $ 456.9 $ 973.2 Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Reconciliation of funded status: Funded status at end of year $ (177.6) $ (222.9) $ (212.6) $ (340.4) $ (263.1) $ (433.0) Contribution made after measurement date N/A N/A N/A N/A N/A N/A Net amount recognized at end of year $ (177.6) $ (222.9) $ (212.6) $ (340.4) $ (263.1) $ (433.0) The following table sets forth the amounts recognized in the consolidated balance sheets as of September 30, 2018, 2017 and 2016: Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Amounts recognized in the consolidated balance sheets: Other non-current assets $ 2.5 $ 19.1 $ 2.3 $ 13.9 $ 2.0 $ 5.3 Accrued expenses and other current liabilities (9.5) — (10.1) — (9.3) — Pension benefit obligations (170.6) (242.0) (204.8) (354.3) (255.8) (438.3) Net amount recognized in the balance sheet $ (177.6) $ (222.9) $ (212.6) $ (340.4) $ (263.1) $ (433.0) The following table details the reconciliation of amounts in the consolidated statements of stockholders’ equity for the fiscal years ended September 30, 2018, 2017 and 2016: Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Reconciliation of amounts in consolidated statements of stockholders’ equity: Prior service (cost) credit $ (0.8) $ 4.1 $ (0.2) $ 4.4 $ (0.2) $ 4.4 Net loss (72.5) (186.4) (94.6) (263.7) (129.6) (343.3) Total recognized in accumulated other comprehensive loss $ (73.3) $ (182.3) $ (94.8) $ (259.3) $ (129.8) $ (338.9) The following table details the components of net periodic benefit cost for the Company’s pension plans for fiscal years ended September 30, 2018, 2017 and 2016: Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Components of net periodic (benefit) cost: Service costs $ 4.9 $ 1.1 $ 4.3 $ 1.3 $ 4.3 $ 1.0 Interest cost on projected benefit obligation 20.7 32.0 19.2 28.3 22.0 39.2 Expected return on plan assets (31.5) (43.1) (31.0) (41.5) (30.8) (48.0) Amortization of prior service credits 0.1 (0.1) — (0.2) — (0.2) Amortization of net loss 4.0 8.2 4.3 13.0 4.0 5.4 Curtailment gain recognized — — — — (6.8) — Settlement (gain) loss recognized — 0.3 — — (0.9) 0.1 Net periodic (benefit) cost $ (1.8) $ (1.6) $ (3.2) $ 0.9 $ (8.2) $ (2.5) The amount of applicable deferred income taxes included in other comprehensive income arising from a change in net prior service cost and net gain/loss was $19.1 million, $27.6 million, and $26.2 million in the years ended September 30, 2018, 2017 and 2016, respectively. Amounts included in accumulated other comprehensive loss as of September 30, 2018 that are expected to be recognized as components of net periodic benefit cost during fiscal 2019 are (in millions): U.S. Int’l Amortization of prior service credit $ (0.1) $ 0.2 Amortization of net actuarial losses (3.6) (4.1) Total $ (3.7) $ (3.9) The table below provides additional year‑end information for pension plans with accumulated benefit obligations in excess of plan assets. Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Projected benefit obligation $ 610.4 $ 1,002.6 $ 658.4 $ 1,158.3 $ 694.8 $ 1,220.3 Accumulated benefit obligation 610.4 991.9 658.4 1,145.7 694.8 1,215.7 Fair value of plan assets 451.5 760.7 466.4 804.2 453.2 782.1 Funding requirements for each pension plan are determined based on the local laws of the country where such pension plan resides. In certain countries, the funding requirements are mandatory while in other countries, they are discretionary. The Company currently intends to contribute $27.2 million to the international plans in fiscal 2019. The required minimum contributions for U.S. plans are not significant. In addition, the Company may make discretionary contributions. The Company currently intends to contribute $14.3 million to U.S. plans in fiscal 2019. The table below provides the expected future benefit payments, in millions: Year Ending September 30, U.S. Int’l 2019 $ 42.9 $ 59.0 2020 42.6 54.9 2021 41.7 56.6 2022 41.7 58.4 2023 41.3 60.5 2024-2028 204.4 327.9 Total $ 414.6 $ 617.3 The underlying assumptions for the pension plans are as follows: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l Weighted-average assumptions to determine benefit obligation: Discount rate 4.15 % 2.91 % 3.64 % 2.67 % 3.41 % 2.35 % Salary increase rate N/A 2.79 % N/A 2.76 % N/A 2.61 % Weighted-average assumptions to determine net periodic benefit cost: Discount rate 3.60 % 2.67 % 3.41 % 2.35 % 4.10 % 3.80 % Salary increase rate N/A 2.76 % N/A 2.61 % N/A 2.65 % Expected long-term rate of return on plan assets 7.00 % 4.73 % 7.00 % 5.10 % 6.72 % 5.74 % Pension costs are determined using the assumptions as of the beginning of the plan year. The funded status is determined using the assumptions as of the end of the plan year. The following table summarizes the Company’s target allocation for 2018 and pension plan asset allocation, both U.S. and international, as of September 30, 2018 and 2017: Percentage of Plan Assets as of September 30, Target Allocations 2018 2017 U.S. Int’l U.S. Int’l U.S. Int’l Asset Category: Equities 40 % 25 % 40 % 38 % 43 % 27 % Debt 51 35 50 36 47 38 Cash 1 10 1 7 1 2 Property and other 8 30 9 19 9 33 Total 100 % 100 % 100 % 100 % 100 % 100 % The Company’s domestic and foreign plans seek a competitive rate of return relative to an appropriate level of risk depending on the funded status and obligations of each plan and typically employ both active and passive investment management strategies. The Company’s risk management practices include diversification across asset classes and investment styles and periodic rebalancing toward asset allocation targets. The target asset allocation selected for each plan reflects a risk/return profile that the Company believes is appropriate relative to each plan’s liability structure and return goals. To develop the expected long-term rate of return on assets assumption, the Company considered the historical returns and the future expectations for returns for each asset class, as well as the target asset allocation of the pension portfolio and the diversification of the portfolio. This resulted in the selection of a 7.00% and 4.73% weighted-average long-term rate of return on assets assumption for the fiscal year ended September 30, 2018 for U.S. and non-U.S. plans, respectively. As of September 30, 2018, the fair values of the Company’s pension plan assets by major asset categories were as follows: Fair Value Measurement as of September 30, 2018 Total Quoted Significant Carrying Prices in Other Significant Value as of Active Observable Unobservable Investments September 30, Markets Inputs Inputs measured at 2018 (Level 1) (Level 2) (Level 3) NAV (in millions) Cash and cash equivalents $ 71.7 $ 37.1 $ 34.6 $ — $ — Equity and debt securities 153.4 153.4 — — — Investment funds Diversified and equity funds 152.0 82.4 69.6 — — Fixed income funds 55.3 3.6 51.7 — — Hedge funds 15.0 — — 15.0 — Common collective funds 951.0 — — — 951.0 Assets held by insurance company 30.0 — — 30.0 — Derivative instruments (7.0) — (7.0) — — Total $ 1,421.4 $ 276.5 $ 148.9 $ 45.0 $ 951.0 As of September 30, 2017, the fair values of the Company’s pension plan assets by major asset categories were as follows: Fair Value Measurement as of September 30, 2017 Total Quoted Significant Carrying Prices in Other Significant Value as of Active Observable Unobservable Investments September 30, Markets Inputs Inputs measured at 2017 (Level 1) (Level 2) (Level 3) NAV (in millions) Cash and cash equivalents $ 22.9 $ 13.1 $ 9.8 $ — $ — Equity and debt securities 7.9 6.2 1.7 — — Investment funds Diversified and equity funds 180.0 6.4 173.6 — — Fixed income funds 153.7 3.5 150.2 — — Hedge funds 14.0 — — 14.0 — Common collective funds 1,068.9 — — — 1,068.9 Assets held by insurance company 31.3 — — 31.3 — Derivative instruments (15.2) — (15.2) — — Total $ 1,463.5 $ 29.2 $ 320.1 $ 45.3 $ 1,068.9 Changes for the year ended September 30, 2018 in the fair value of the Company’s recurring post-retirement plan Level 3 assets are as follows: Actual return Actual return on on plan assets, Change September 30, plan assets, relating to Transfer due to 2017 relating to assets assets sold Purchases, into / exchange September 30, Beginning still held at during the sales and (out of) rate 2018 balance reporting date period settlements Level 3 changes Ending balance (in millions) Investment funds Hedge funds $ 45.3 $ 0.4 $ — $ 0.2 $ — $ (0.9) $ 45.0 Changes for the year ended September 30, 2017, in the fair value of the Company’s recurring post-retirement plan Level 3 assets are as follows: Actual return Actual return on on plan assets, Change September 30, plan assets, relating to Transfer due to 2016 relating to assets assets sold Purchases, into / exchange September 30, Beginning still held at during the sales and (out of) rate 2017 balance reporting date period settlements Level 3 changes Ending balance (in millions) Investment funds Hedge funds $ 43.3 $ (0.7) $ — $ 1.7 $ — $ 1.0 $ 45.3 Cash equivalents are mostly comprised of short‑term money‑market instruments and are valued at cost, which approximates fair value. For equity investment funds not traded on an active exchange, or if the closing price is not available, the trustee obtains indicative quotes from a pricing vendor, broker, or investment manager. These funds are categorized as Level 2 if the custodian obtains corroborated quotes from a pricing vendor or categorized as Level 3 if the custodian obtains uncorroborated quotes from a broker or investment manager. Fixed income investment funds categorized as Level 2 are valued by the trustee using pricing models that use verifiable observable market data (e.g., interest rates and yield curves observable at commonly quoted intervals), bids provided by brokers or dealers, or quoted prices of securities with similar characteristics. Hedge funds categorized as Level 3 are valued based on valuation models that include significant unobservable inputs and cannot be corroborated using verifiable observable market data. Hedge funds are valued by independent administrators. Depending on the nature of the assets, the general partners or independent administrators use both the income and market approaches in their models. The market approach consists of analyzing market transactions for comparable assets while the income approach uses earnings or the net present value of estimated future cash flows adjusted for liquidity and other risk factors. As of September 30, 2018, there were no material changes to the valuation techniques. Common collective funds are valued based on net asset value (NAV) per share or unit as a practical expedient as reported by the fund manager, multiplied by the number of shares or units held as of the measurement date. Accordingly, these NAV-based investments have been excluded from the fair value hierarchy. These collective investment funds have minimal redemption notice periods and are redeemable daily at the NAV, less transaction fees, without significant restrictions. There are no significant unfunded commitments related to these investments. Multiemployer Pension Plans The Company participates in over 200 construction-industry multiemployer pension plans. Generally, the plans provide defined benefits to substantially all employees covered by collective bargaining agreements. Under the Employee Retirement Income Security Act, a contributor to a multiemployer plan is liable, upon termination or withdrawal from a plan, for its proportionate share of a plan’s unfunded vested liability. The Company’s aggregate contributions to these multiemployer plans were $49.8 million and $48.8 million for the years ended September 30, 2018 and 2017, respectively. At September 30, 2018 and 2017, none of the plans in which the Company participates are individually significant to its consolidated financial statements.

Debt

Debt	12 Months Ended
	Sep. 30, 2018
Debt
Debt	8. Debt Debt consisted of the following: September 30, September 30, 2018 2017 (in millions) 2014 Credit Agreement $ 1,433.8 $ 908.7 2014 Senior Notes 800.0 1,600.0 2017 Senior Notes 1,000.0 1,000.0 URS Senior Notes 247.9 247.7 Other debt 191.8 140.0 Total debt 3,673.5 3,896.4 Less: Current portion of debt and short-term borrowings (143.1) (142.0) Less: Unamortized debt issuance costs (46.7) (52.3) Long-term debt $ 3,483.7 $ 3,702.1 The following table presents, in millions, scheduled maturities of the Company’s debt as of September 30, 2018: Fiscal Year 2019 $ 143.1 2020 92.5 2021 341.5 2022 304.9 2023 458.8 Thereafter 2,332.7 Total $ 3,673.5 2014 Credit Agreement The Company entered into a credit agreement (Credit Agreement) on October 17, 2014, which, as amended to date, consists of (i) a term loan A facility that includes a $510 million (US) term loan A facility with a term expiring on March 13, 2021 and a $500 million Canadian dollar (CAD) term loan A facility and a $250 million Australian dollar (AUD) term loan A facility, each with terms expiring on March 13, 2023; (ii) a $600 million term loan B facility with a term expiring on March 13, 2025; and (iii) a revolving credit facility in an aggregate principal amount of $1.35 billion with a term expiring on March 13, 2023. Some of subsidiaries of the Company (Guarantors) have guaranteed the obligations of the borrowers under the Credit Agreement. The borrowers’ obligations under the Credit Agreement are secured by a lien on substantially all of the assets of the Company and the Guarantors pursuant to a security and pledge agreement (Security Agreement). The collateral under the Security Agreement is subject to release upon fulfillment of conditions specified in the Credit Agreement and Security Agreement. The Credit Agreement contains covenants that limit the ability of the Company and the ability of some of its subsidiaries to, among other things: (i) create, incur, assume, or suffer to exist liens; (ii) incur or guarantee indebtedness; (iii) pay dividends or repurchase stock; (iv) enter into transactions with affiliates; (v) consummate asset sales, acquisitions or mergers; (vi) enter into various types of burdensome agreements; or (vii) make investments. On July 1, 2015, the Credit Agreement was amended to revise the definition of “Consolidated EBITDA” to increase the allowance for acquisition and integration expenses related to the Company’s acquisition of URS. On December 22, 2015, the Credit Agreement was amended to further revise the definition of “Consolidated EBITDA” by further increasing the allowance for acquisition and integration expenses related to the acquisition of URS and to allow for an internal corporate restructuring primarily involving the Company’s international subsidiaries. On September 29, 2016, the Credit Agreement and the Security Agreement were amended to (1) lower the applicable interest rate margins for the term loan A and the revolving credit facilities, and lower the applicable letter of credit fees and commitment fees to the revised consolidated leverage levels; (2) extend the term of the term loan A and the revolving credit facility to September 29, 2021; (3) add a new delayed draw term loan A facility tranche in the amount of $185.0 million; (4) replace the then existing $500 million performance letter of credit facility with a $500 million basket to enter into secured letters of credit outside the Credit Agreement; and (5) revise covenants, including the Maximum Consolidated Leverage Ratio so that the step down from a 5.00 to a 4.75 leverage ratio is effective as of March 31, 2017 as well as the investment basket for the Company’s AECOM Capital business. On March 31, 2017, the Credit Agreement was amended to (1) expand the ability of restricted subsidiaries to borrow under “Incremental Term Loans”; (2) revise the definition of “Working Capital” as used in “Excess Cash Flow”; (3) revise the definitions for “Consolidated EBITDA” and “Consolidated Funded Indebtedness” to reflect the expected gain and debt repayment of an AECOM Capital disposition, which disposition was completed on April 28, 2017; and (4) amend provisions relating to the Company's ability to undertake internal restructuring steps to accommodate changes in tax laws. On March 13, 2018, the Credit Agreement was amended to (1) refinance the existing term loan A facility to include a $510 million (US) term loan A facility with a term expiring on March 13, 2021 and a $500 million CAD term loan A facility and a $250 million AUD term loan A facility each with terms expiring on March 13, 2023; (2) issue a new $600 million term loan B facility to institutional investors with a term expiring on March 13, 2025; (3) increase the capacity of the Company’s revolving credit facility from $1.05 billion to $1.35 billion and extend its term until March 13, 2023; (4) reduce the Company’s interest rate borrowing costs as follows: (a) the term loan B facility, at the Company’s election, Base Rate (as defined in the Credit Agreement) plus 0.75% or Eurocurrency Rate (as defined in the Credit Agreement) plus 1.75%, (b) the (US) term loan A facility, at the Company’s election, Base Rate plus 0.50% or Eurocurrency Rate plus 1.50%, and (c) the Canadian (CAD) term loan A facility, the Australian (AUD) term loan A facility, and the revolving credit facility, an initial rate of, at the Company’s election, Base Rate plus 0.75% or Eurocurrency Rate plus 1.75%, and after the end of the Company’s fiscal quarter ended June 30, 2018, Base Rate loans plus a margin ranging from 0.25% to 1.00% or Eurocurrency Rate plus a margin from 1.25% to 2.00%, based on the Consolidated Leverage Ratio (as defined in the Credit Agreement); (5) revise covenants including increasing the amounts available under the restricted payment negative covenant and revising the Maximum Consolidated Leverage Ratio (as defined in the Credit Agreement) to include a 4.5 leverage ratio through September 30, 2019 after which the leverage ratio steps down to 4.0. Under the Credit Agreement, the Company is subject to a maximum consolidated leverage ratio and minimum consolidated interest coverage ratio at the end of each fiscal quarter. The Company’s Consolidated Leverage Ratio was 3.9 at September 30, 2018. The Company’s Consolidated Interest Coverage Ratio was 4.6 at September 30, 2018. As of September 30, 2018, the Company was in compliance with the covenants of the Credit Agreement. At September 30, 2018 and 2017, outstanding standby letters of credit totaled $28.7 million and $58.1 million, respectively, under the Company’s revolving credit facilities. As of September 30, 2018 and 2017, the Company had $1,321.3 million and $991.9 million, respectively, available under its revolving credit facility. 2014 Senior Notes On October 6, 2014, the Company completed a private placement offering of $800,000,000 aggregate principal amount of the unsecured 5.750% Senior Notes due 2022 (2022 Notes) and $800,000,000 aggregate principal amount of the unsecured 5.875% Senior Notes due 2024 (the 2024 Notes and, together with the 2022 Notes, the 2014 Senior Notes). On November 2, 2015, the Company completed an exchange offer to exchange the unregistered 2014 Senior Notes for registered notes, as well as all related guarantees. On March 16, 2018, the Company redeemed all of the 2022 Notes at a redemption price that was 104.313% of the principal amount outstanding plus accrued and unpaid interest. The March 16, 2018 redemption resulted in a $34.5 million prepayment premium, which was included in interest expense. As of September 30, 2018, the estimated fair value of the 2024 Notes was approximately $844.0 million. The fair value of the 2024 Notes as of September 30, 2018 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 2024 Notes. At any time prior to July 15, 2024, the Company may redeem on one or more occasions all or part of the 2024 Notes at a redemption price equal to the sum of (i) 100% of the principal amount thereof, plus (ii) a “make-whole” premium as of the date of the redemption, plus any accrued and unpaid interest to the date of redemption. In addition, on or after July 15, 2024, the 2024 Notes may be redeemed at a redemption price of 100% of the principal amount thereof, plus accrued and unpaid interest to the date of redemption. The indenture pursuant to which the 2024 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 2024 Notes as of September 30, 2018. 2017 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 2017 Senior Notes) and used the proceeds to immediately retire the remaining $127.6 million outstanding on the then existing term loan B facility as well as repay $600 million of the term loan A facility and $250 million of the revolving credit facility under its Credit Agreement. On June 30, 2017, the Company completed an exchange offer to exchange the unregistered 2017 Senior Notes for registered notes, as well as related guarantees. As of September 30, 2018, the estimated fair value of the 2017 Senior Notes was approximately $965.0 million. The fair value of the 2017 Senior Notes as of September 30, 2018 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 2017 Senior Notes. Interest will be payable on the 2017 Senior Notes at a rate of 5.125% per annum. Interest on the 2017 Senior Notes will be payable semi-annually on March 15 and September 15 of each year, commencing on September 15, 2017. The 2017 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 2017 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. In addition, at any time and from time to time prior to March 15, 2020, the Company may redeem up to 35% of the original aggregate principal amount of the 2017 Senior Notes with the proceeds of one or more qualified equity offerings, at a redemption price equal to 105.125%, plus accrued and unpaid interest. Furthermore, at any time on or after December 15, 2026, the Company may redeem on one or more occasions all or part of the 2017 Senior Notes at a redemption price equal to 100% of their principal amount, plus accrued and unpaid interest. The indenture pursuant to which the 2017 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 2017 Senior Notes as of September 30, 2018. URS Senior Notes In connection with the URS acquisition, the Company assumed the URS 3.85% Senior Notes due 2017 (2017 URS Senior Notes) and the URS 5.00% Senior Notes due 2022 (2022 URS Senior Notes), totaling $1.0 billion (URS Senior Notes). The URS acquisition triggered change in control provisions in the URS Senior Notes that allowed the holders of the URS Senior Notes to redeem their URS Senior Notes at a cash price equal to 101% of the principal amount and, accordingly, the Company redeemed $572.3 million of the URS Senior Notes on October 24, 2014. The remaining 2017 URS Senior Notes matured and were fully redeemed on April 3, 2017 for $179.2 million using proceeds from a $185 million delayed draw term loan A facility tranche under the Credit Agreement. The 2022 URS Senior Notes are general unsecured senior obligations of AECOM Global II, LLC as successor in interest to URS) and are fully and unconditionally guaranteed on a joint-and-several basis by some former URS domestic subsidiary guarantors. As of September 30, 2018, the estimated fair value of the 2022 URS Senior Notes was approximately $251.0 million. The carrying value of the 2022 URS Senior Notes on the Company’s Consolidated Balance Sheets as of September 30, 2018 was $247.9 million. The fair value of the 2022 URS Senior Notes as of September 30, 2018 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 2022 URS Senior Notes. As of September 30, 2018, the Company were in compliance with the covenants relating to the 2022 URS Senior Notes. Other Debt and Other Items Other debt consists primarily of obligations under capital leases and loans, and unsecured credit facilities. The Company’s unsecured credit facilities are primarily used for standby letters of credit issued in connection with general and professional liability insurance programs and for contract performance guarantees. At September 30, 2018 and 2017, these outstanding standby letters of credit totaled $486.4 million and $445.7 million, respectively. As of September 30, 2018, the Company had $480.3 million available under these 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 years ended September 30, 2018, 2017 and 2016 was 4.6%, 4.6% and 4.4%, respectively. Interest expense in the consolidated statements of operations for the year ended September 30, 2018 included a prepayment premium of $34.5 million to redeem the 2022 Notes. Additionally, amortization of deferred debt issuance costs for the year ended September 30, 2018 and 2017 was $18.1 million and $17.5 million, respectively.

Derivative Financial Instrument

Derivative Financial Instruments and Fair Value Measurements	12 Months Ended
	Sep. 30, 2018
Derivative Financial Instruments and Fair Value Measurements
Derivative Financial Instruments and Fair Value Measurements	9. Derivative Financial Instruments and Fair Value Measurements The Company uses certain 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 also uses foreign currency contracts designated as cash flow hedges to hedge forecasted revenue transactions denominated in currencies other than the U.S. dollar. 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 to either interest expense when the interest expense on the variable rate debt is recognized, or to cost of revenue when the hedged revenues are recorded. If the hedged transaction becomes probable of not occurring, any gain or loss related to interest rate swap agreements or foreign currency contracts would be recognized in other income (expense). Further, the Company excludes the change in the time value of the foreign currency contracts from the assessment of hedge effectiveness. The Company records the premium paid or time value of a contract on the date of purchase as an asset. Thereafter, the Company recognizes any change to this time value in cost of revenue. The notional principal in U.S. dollar (USD), Canadian dollar (CAD), and Australian dollar (AUD), fixed rates and related expiration dates of the Company’s outstanding interest rate swap agreements were as follows: September 30, 2018 Notional Amount Notional Amount Fixed Expiration Currency (in millions) Rate Date AUD 200.0 2.19 % February 2021 CAD 400.0 2.49 % September 2022 USD 200.0 2.60 % February 2023 September 30, 2017 Notional Amount Notional Amount Fixed Expiration Currency (in millions) Rate Date USD 300.0 1.63 % June 2018 USD 300.0 1.54 % September 2018 The notional principal of outstanding foreign currency contracts to purchase AUD was AUD 65.2 million (or $49.1 million) at September 30, 2018. The notional principal of outstanding foreign currency contracts to purchase AUD was AUD 15.1 million (or $11.3 million) at September 30, 2017. 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 years ended September 30, 2018, 2017 and 2016. Fair Value Measurements The Company’s non-pension financial assets and liabilities recorded at fair values relate to derivative instruments and were not material at September 30, 2018 or 2017. See Note 17 for accumulated balances and reporting period activities of derivatives related to reclassifications out of accumulated other comprehensive income or loss for the years ended September 30, 2018, 2017 and 2016. Amounts recognized in accumulated other comprehensive loss from the Company’s foreign currency options were immaterial for all years presented. Amounts reclassified from accumulated other comprehensive loss into income from the foreign currency options were immaterial for all years presented. Additionally, there were no material losses recognized in income due to amounts excluded from effectiveness testing from the Company’s interest rate swap agreements. During the year ended September 30, 2015, the Company entered into a contingent consideration arrangement in connection with a business acquisition. Under the arrangement, the Company agreed to pay cash to the sellers if certain financial performance thresholds are achieved in the future. The fair value of the contingent consideration liability , net of amounts paid, as of September 30, 2018 and 2017 was $11 million and $13 million, respectively. This liability is a Level 3 fair value measurement recorded within other accrued liabilities, and was valued based on estimated future net cash flows. Any future changes in the fair value of this contingent consideration liability will be recognized in earnings during the applicable period.

Concentration of Credit Risk

Concentration of Credit Risk	12 Months Ended
	Sep. 30, 2018
Concentration of Credit Risk
Concentration of Credit Risk	10. Concentration of Credit Risk Financial instruments which potentially subject the Company to concentrations of credit risk consist principally of cash investments and trade receivables. The Company’s cash balances and short‑term investments are maintained in accounts held by major banks and financial institutions located primarily in the U.S., Canada, Europe, Australia, Middle East and Hong Kong. If the Company extends significant credit to clients in a specific geographic area or industry, the Company may experience disproportionately high levels of default if those clients are adversely affected by factors particular to their geographic area or industry. Concentrations of credit risk with respect to trade receivables are limited due to the large number of customers comprising the Company’s customer base, including, in large part, governments, government agencies and quasi‑government organizations, and their dispersion across many different industries and geographies. See Note 19 regarding the Company’s foreign revenues. In order to mitigate credit risk, the Company continually reviews the credit worthiness of its major private clients.

Leases

Leases	12 Months Ended
	Sep. 30, 2018
Leases
Leases	11. Leases The Company and its subsidiaries are lessees in non‑cancelable leasing agreements for office buildings and equipment. The related 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. The following table presents, in millions, amounts payable under non‑cancelable operating lease commitments during the following fiscal years: Year Ending September 30, 2019 $ 253.3 2020 211.5 2021 165.8 2022 136.0 2023 111.8 Thereafter 433.6 Total $ 1,312.0 Rent expense for leases for the years ended September 30, 2018, 2017 and 2016 was approximately $268.5 million, $265.9 million, and $383.7 million, respectively. When the Company is required to restore leased facilities to original condition, provisions are made over the period of the lease.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Sep. 30, 2018
Stockholders' Equity
Stockholders' Equity	12. Stockholders’ Equity Common Stock Units —Common stock units are only redeemable for common stock. In the event of liquidation of the Company, holders of stock units are entitled to no greater rights than holders of common stock. See also Note 13. Accelerated Share Repurchase— In August 2018, the Company entered into an accelerated share repurchase (ASR) with JPMorgan Chase Bank, National Association (JPMorgan) to repurchase $150 million of its common stock. During the quarter ended September 30, 2018, JPMorgan delivered 4.0 million shares to the Company, at which point the Company’s shares outstanding were reduced and accounted for as a reduction to retained earnings. The initial share delivery represented the minimum amount of shares JPMorgan was contractually obligated to provide under the ASR agreement. The ASR completed on October 11, 2018, which resulted in the delivery of an additional 0.6 million shares to the Company from JPMorgan.

Share-Based Payments

Share-Based Payments	12 Months Ended
	Sep. 30, 2018
Share-Based Payments
Share-Based Payments	13. Share-Based Payments Defined Contribution Plans —Substantially all permanent domestic employees are eligible to participate in defined contribution plans provided by the Company. Under these plans, participants may make contributions into a variety of funds, including a fund that is fully invested in Company stock. Employees are not required to allocate any funds to Company stock; however, the Company does provide an annual Company match in AECOM shares. Employees may generally reallocate their account balances on a daily basis; however, employees classified as insiders are restricted under the Company’s insider trading policy. Compensation expense relating to these employer contributions related to AECOM stock under defined contribution plans for fiscal years ended September 30, 2018, 2017 and 2016 was $32.3 million, $32.9 million, and $26.8 million, respectively. Stock Incentive Plans —Under the 2016 Stock Incentive Plan, the Company has up to 12.6 million securities remaining available for future issuance as of September 30, 2018. Stock options may be granted to employees and non‑employee directors with an exercise price not less than the fair market value of the stock on the date of grant. Unexercised options expire seven years after date of grant. During the three years in the period ended September 30, 2018, option activity was as follows: Number of Weighted Options Average (in millions) Exercise Price Balance, September 30, 2015 1.3 28.26 Granted — — Exercised (0.4) 23.96 Cancelled — — Balance, September 30, 2016 0.9 30.36 Granted — — Exercised (0.2) 26.42 Cancelled — — Balance, September 30, 2017 0.7 31.11 Granted — — Exercised (0.1) 27.79 Cancelled — — Balance, September 30, 2018 0.6 31.62 Exercisable as of September 30, 2016 0.3 26.99 Exercisable as of September 30, 2017 0.1 27.79 Exercisable as of September 30, 2018 — N/A The following table summarizes information concerning outstanding and exercisable options as of September 30, 2018: Options Outstanding Options Exercisable Number Number Outstanding Weighted Exercisable Weighted as of Average Weighted Aggregate as of Average Weighted September 30, Remaining Average Intrinsic September 30, Remaining Average 2018 Contractual Exercise Value 2018 Contractual Exercise (in millions) Life Price (in millions) (in millions) Life Price Exercise Price $31.62 0.6 5.43 $ 31.62 $ 0.7 — — The aggregate intrinsic value of stock options exercised during the years ended September 30, 2018, 2017 and 2016 was $0.9 million, $1.2 million, and $0.6 million, respectively. 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 option on the grant date. The Company uses historical data as a basis to estimate the probability of forfeitures. No stock options were granted during the years ended September 30, 2018 and 2017. 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 $37.69, $38.15, and $29.91 during the years ended September 30, 2018, 2017 and 2016, respectively. The weighted average grant date fair value of restricted stock unit awards was $36.83, $37.96, and $29.82 during the years ended September 30, 2018, 2017 and 2016, respectively. Total compensation expense related to these share-based payments including stock options was $73.1 million, $83.8 million, and $73.4 million during the years ended September 30, 2018, 2017 and 2016, respectively. Unrecognized compensation expense related to total share-based payments outstanding as of September 30, 2018 and 2017 was $94.3 million and $96.8 million, respectively, to be recognized on a straight-line basis over the awards’ respective vesting periods which are generally three years.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2018
Income Taxes
Income Taxes	14. Income before income taxes included income from domestic operations of $317.9 million, $322.2 million, and $51.6 million for fiscal years ended September 30, 2018, 2017 and 2016 and income (loss) from foreign operations of $(140.4) million, $107.0 million, and $74.0 million for fiscal years ended September 30, 2018, 2017 and 2016. Income tax (benefit) expense was comprised of: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 (in millions) Current: Federal $ (122.4) $ 10.3 $ 33.7 State 19.0 17.9 12.4 Foreign 47.1 29.3 26.1 Total current income tax expense (56.3) 57.5 72.2 Deferred: Federal 14.5 (8.3) (63.4) State 39.0 10.4 (5.4) Foreign (16.8) (51.9) (41.3) Total deferred income tax expense (benefit) 36.7 (49.8) (110.1) Total income tax (benefit) expense $ (19.6) $ 7.7 $ (37.9) The major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year ended September 30, 2018 and 35% for fiscal years ended September 30, 2017 and 2016 and the effective tax rate are as follows: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 Amount % Amount % Amount % (in millions) Tax at federal statutory rate $ 43.5 24.5 % $ 150.3 35.0 % $ 43.9 35.0 % State income tax, net of federal benefit 17.8 10.0 24.3 5.7 5.6 4.5 Valuation allowance 58.7 33.1 (51.2) (11.9) (54.8) (43.6) Impairment, nondeductible for tax 33.9 19.1 — — — — Foreign residual income 10.3 5.8 (9.2) (2.1) 17.8 14.2 Nondeductible costs 3.5 1.9 5.8 1.4 6.1 4.8 Change in tax rates 0.1 0.1 — — 34.6 27.6 Impact of changes in tax law (47.8) (26.9) — — — — Income tax credits and incentives (37.2) (21.0) (56.8) (13.2) (24.6) (19.6) Change in uncertain tax positions (31.4) (17.7) 9.5 2.2 (5.0) (4.0) Audit settlement (27.7) (15.6) — — — — Return to provision, primarily foreign tax credits (18.5) (10.4) — — — — Exclusion of tax on non-controlling interests (14.9) (8.4) (28.2) (6.6) (24.7) (19.7) Tax exempt income (7.4) (4.2) (17.9) (4.2) (17.6) (14.0) Foreign tax rate differential (1.6) (0.9) (19.2) (4.5) (19.7) (15.7) Other items, net (0.9) (0.5) 0.3 — 0.5 0.3 Total income tax expense $ (19.6) (11.1) % $ 7.7 1.8 % $ (37.9) (30.2) % During the first quarter of 2018, President Trump signed what is commonly referred to as The Tax Cuts and Jobs Act (the Tax Act) into law. The Tax Act reduced the Company’s U.S. federal corporate tax rate from 35% to a blended tax rate of 24.5% for its fiscal year ending September 30, 2018 and 21% for fiscal years thereafter, requires companies to pay a one-time transition tax on accumulated earnings of foreign subsidiaries, creates new taxes on foreign sourced earnings and eliminates or reduces deductions. Given the significance of the Tax Act, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period” similar to that used when accounting for business combinations. However, the measurement period is deemed to have ended earlier when the registrant has obtained, prepared and analyzed the information necessary to finalize its accounting. During the measurement period, impacts of the law are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed. During the fiscal year 2018, the Company recorded a $32.0 million provisional tax benefit related to the remeasurement of its U.S. deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. In addition, the Company released the deferred tax liability and recorded a tax benefit related to foreign subsidiaries for which the undistributed earnings are not intended to be reinvested indefinitely for $79.8 million and accrued $64 million of tax expense related to the one-time transition tax. The Company has not yet completed its calculation of the total foreign earnings and profits of its foreign subsidiaries and accordingly this amount may change when the Company finalizes the calculation of foreign earnings. During the fourth quarter of 2018, the Company recorded a valuation allowance of $38.1 million against foreign tax credits related to deferred tax assets in the U.S. In its determination of the realizability of its deferred tax assets, the Company evaluated positive evidence consisting of forecasts of foreign tax credit utilization against future foreign source income, earnings trends over a sustainable period, positive economic conditions in the industries the Company operates in, possible prudent and feasible tax planning strategies (net of costs to implement the tax planning strategies) and actual usage of foreign tax credit carryforwards. The Company also evaluated negative evidence consisting of significant foreign tax credits and U.S. tax law changes that restrict the usage of foreign tax credits. This evaluation was conducted on a tax jurisdictional basis or legal entity basis, as applicable, and based on the weighing of all positive and negative evidence, a determination was made as to the realizability of the deferred tax assets on that same basis. During the fourth quarter of 2018, the Company restructured certain operations in Canada which resulted in a release of a valuation allowance of $13.1 million. Certain operations in Canada continue to forecast losses and the valuation allowances could be reduced if the earnings trends reverse. During the second quarter of 2017, valuation allowances in the amount of $59.9 million in the United Kingdom were released due to sufficient positive evidence obtained during that quarter. Generally, the Company would reverse its valuation allowance in a particular tax jurisdiction if the positive evidence examined, such as projected and sustainable earnings or a tax-planning strategy that allows for the usage of the deferred tax asset, is sufficient to overcome significant negative evidence, such as large net operating loss carryforwards or a cumulative history of losses in recent years. In the United States, the valued deferred tax assets have a restricted life or use under relevant tax law and, therefore, it is unlikely that the valuation allowance related to these assets will reverse. In addition, the Company is continually investigating tax planning strategies that, if prudent and feasible, may be implemented to realize a deferred tax asset that would otherwise expire unutilized. The identification and internal/external approval (as relevant) of such a prudent and feasible tax planning strategy could cause a reduction in the valuation allowance. During the fourth quarter of 2018, the Company effectively settled a U.S. federal income tax examination for URS pre-acquisition tax years 2012, 2013 and 2014 and recorded a benefit of $27.7 million related to various adjustments, in addition to the favorable settlement for R&D credits of $26.2 million recorded in the second quarter of 2018. The Company is currently under tax audit in several jurisdictions including the U.S and believe the outcomes which are reasonably possible within the next twelve months, including lapses in statutes of limitations, could result in adjustments, but will not result in a material change in the liability for uncertain tax positions. In the fourth quarter of 2017, the Company executed international restructuring transactions that resulted in a distribution of current year earnings and profits and the associated foreign tax credits. The distribution resulted in the recognition of a benefit of $25.2 million related to excess foreign tax credits expected to be realized in the foreseeable future. These current year earnings had previously been forecasted to qualify for the indefinite reinvestment criterion. The Company’s change in assertion for these investments was a one-time event and did not impact the Company’s past or future assertions regarding intent and ability to reinvest indefinitely. In the third quarter of 2017, the Company recapitalized one of its European subsidiaries which resulted in the Company indefinitely reinvesting a portion of its non-U.S. undistributed earnings that U.S. tax had previously been provided for and released the associated $21.2 million deferred tax liability. These non-U.S. earnings are now intended to be reinvested indefinitely outside of the U.S. to meet the Company’s current and future cash needs of its European operations. The deferred tax assets (liabilities) are as follows: Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Deferred tax assets: Compensation and benefit accruals not currently deductible $ 108.3 $ 144.2 Net operating loss carryforwards 252.4 338.2 Self-insurance reserves 13.5 23.8 Research and experimentation and other tax credits 178.1 167.5 Pension liability 88.2 142.1 Accrued liabilities 63.4 160.7 Other 27.8 25.0 Total deferred tax assets 731.7 1,001.5 Deferred tax liabilities: Unearned revenue (121.1) (190.8) Depreciation and amortization (135.9) (158.6) Acquired intangible assets (56.0) (121.7) Investment in subsidiaries (109.5) (241.2) Total deferred tax liabilities (422.5) (712.3) Valuation allowance (197.1) (138.4) Net deferred tax assets $ 112.1 $ 150.8 As of September 30, 2018, the Company has available unused federal, state and foreign net operating loss (NOL) carryforwards of $50.3 million, $707.0 million and $968.4 million, respectively, which expire at various dates over the next several years; the federal NOL carryforwards and some foreign NOL carryforwards never expire. In addition, as of September 30, 2018, the Company has unused federal and state research and development credits of $79.1 million and $33.4 million, respectively, foreign tax credits of $61.8 million, and California Enterprise Zone Tax Credits of $6.8 million which expire at various dates over the next several years. As of September 30, 2018 and 2017, gross deferred tax assets were $731.7 million and $1,001.5 million, respectively. The Company has recorded a valuation allowance of $197.1 million and $138.4 million at September 30, 2018 and 2017, respectively, primarily related to foreign tax credits, state and foreign net operating loss carryforwards and credits and deferred tax assets related to certain pension obligations (primarily in the United Kingdom and Canada). The Company has performed an assessment of positive and negative evidence, including the nature, frequency, and severity of cumulative financial reporting losses in recent years, the future reversal of existing temporary differences, predictability of future taxable income exclusive of reversing temporary differences of the character necessary to realize the asset, relevant carryforward periods, taxable income in carry-back years if carry-back is permitted under tax law, and prudent and feasible tax planning strategies that would be implemented, if necessary, to protect against the loss of the deferred tax asset that would otherwise expire. Although realization is not assured, based on the Company’s assessment, the Company has concluded that it is more likely than not that the remaining gross deferred tax asset (exclusive of deferred tax liabilities) of $534.6 million will be realized and, as such, no additional valuation allowance has been provided. The net increase in the valuation allowance of $58.7 million is primarily attributable to changes in valuation allowances of $36.3 million for foreign tax credits and increases in valuation allowances for unbenefitable losses, partially offset by the release of $13.1 million of valuation allowances for Canada and the utilization of $7.7 million of foreign net operating loss carryforwards in the current year. 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 $1.7 billion are able to and intended to be reinvested indefinitely. As of September 30, 2018, the Company has not completed its assessment of the Tax Act on its plans to indefinitely reinvest foreign earnings and as such has not changed its prior conclusion that the earnings are indefinitely reinvested. 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. During the first quarter of 2017, the Company adopted a new accounting standard that amended certain aspects of the accounting for employee share-based payments and as a result recorded an adjustment of $3.8 million to equity to recognize net operating loss carryforwards attributable to excess tax benefits on stock compensation that had not been previously recognized to additional paid in capital. As of September 30, 2018 and 2017, the Company had a liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit, totaling $71.9 million and $109.5 million, respectively. The gross unrecognized tax benefits as of September 30, 2018 and 2017 were $60.0 million and $102.1 million, respectively, excluding interest, penalties, and related tax benefit. Of Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Balance at the beginning of the year $ 102.1 $ 87.9 Gross increase in current period’s tax positions 4.0 10.8 Gross increase in prior years’ tax positions 2.2 5.3 Gross decrease in prior years’ tax positions (14.4) — Decrease due to settlement with tax authorities (31.9) (1.0) Decrease due to lapse of statute of limitations (1.7) (1.1) Gross change due to foreign exchange fluctuations (0.3) 0.2 Balance at the end of the year $ 60.0 $ 102.1 The Company classifies interest and penalties related to uncertain tax positions within the income tax expense line in the accompanying consolidated statements of operations. As of September 30, 2018, the accrued interest and penalties were $15.5 million and $4.1 million, respectively, excluding any related income tax benefits. At September 30, 2017, the accrued interest and penalties were $15.1 million and $4.1 million, respectively, excluding any related income tax benefits. The Company files income tax returns in numerous tax jurisdictions, including the U.S., and numerous U.S. states and non-U.S. jurisdictions around the world. The statute of limitations varies by jurisdiction in which the Company operates. Because of the number of jurisdictions in which the Company files tax returns, in any given year the statute of limitations in certain jurisdictions may expire without examination within the 12-month period from the balance sheet date. While it is reasonably possible that the total amounts of unrecognized tax benefits could significantly increase or decrease within the next twelve months, an estimate of the range of possible change cannot be made.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Sep. 30, 2018
Earnings Per Share
Earnings Per Share	15. 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 periods presented, equity awards excluded from the calculation of potential common shares were not significant. The following table sets forth a reconciliation of the denominators of basic and diluted earnings per share: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 (in millions) Denominator for basic earnings per share 159.1 155.7 154.8 Potential common shares 3.2 3.4 1.3 Denominator for diluted earnings per share 162.3 159.1 156.1

Other Financial Information

Other Financial Information	12 Months Ended
	Sep. 30, 2018
Other Financial Information
Other Financial Information	16. Other Financial Information Accrued expenses and other current liabilities consist of the following: Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Accrued salaries and benefits $ 1,035.9 $ 1,018.5 Accrued contract costs 861.0 911.9 Other accrued expenses 370.1 315.1 $ 2,267.0 $ 2,245.5 Accrued contract costs above include balances related to professional liability accruals of $519.5 million and $547.9 million as of September 30, 2018 and 2017, respectively. The remaining accrued contract costs primarily relate to costs for services provided by subcontractors and other non-employees. Liabilities recorded related to accrued contract losses were not material as of September 30, 2018 and 2017. The Company did not have material revisions to estimates for contracts where revenue is recognized using the percentage-of-completion method during the twelve months ended September 30, 2018. During the twelve months ended September 30, 2016, the Company recorded revenue related to the expected accelerated recovery of a pension related entitlement from the federal government of approximately $50 million, which is included in accounts receivable-net at September 30, 2018 and 2017. The entitlement resulted from pension costs that are reimbursable through certain government contracts in accordance with Cost Accounting Standards. The accelerated recognition resulted from an amendment to freeze pension benefits under URS Federal Services, Inc. Employees Retirement Plan. The actual amount of reimbursement may vary from the Company’s expectation.

Reclassifications out of Accumu

Reclassifications out of Accumulated Other Comprehensive Loss	12 Months Ended
	Sep. 30, 2018
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications out of Accumulated Other Comprehensive Loss	17. Reclassifications out of Accumulated Other Comprehensive Loss The accumulated balances and reporting period activities for the years ended September 30, 2018, 2017 and 2016 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions): Foreign Accumulated Pension Currency Loss on Other Related Translation Derivative Comprehensive Adjustments Adjustments Instruments Loss Balances at September 30, 2015 $ (204.0) $ (420.1) $ (11.0) $ (635.1) Other comprehensive income (loss) before reclassification (171.5) (63.6) 1.2 (233.9) Amounts reclassified from accumulated other comprehensive loss 6.6 — 4.8 11.4 Balances at September 30, 2016 $ (368.9) $ (483.7) $ (5.0) $ (857.6) Foreign Accumulated Pension Currency Loss on Other Related Translation Derivative Comprehensive Adjustments Adjustments Instruments Loss Balances at September 30, 2016 $ (368.9) $ (483.7) $ (5.0) $ (857.6) Other comprehensive income (loss) before reclassification 73.8 65.3 2.3 141.4 Amounts reclassified from accumulated other comprehensive loss 13.2 — 2.3 15.5 Balances at September 30, 2017 $ (281.9) $ (418.4) $ (0.4) $ (700.7) Foreign Accumulated Pension Currency Loss on Other Related Translation Derivative Comprehensive Adjustments Adjustments Instruments Loss Balances at September 30, 2017 $ (281.9) $ (418.4) $ (0.4) $ (700.7) Other comprehensive income (loss) before reclassification 69.9 (83.8) 0.7 (13.2) Amounts reclassified from accumulated other comprehensive loss 9.7 — 0.9 10.6 Balances at September 30, 2018 $ (202.3) $ (502.2) $ 1.2 $ (703.3)

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2018
Commitments and Contingencies
Commitments and Contingencies	18. 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. Performance arrangements typically have various expiration dates ranging from the completion of the project contract and extending beyond contract completion in certain 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 September 30, 2018, the Company was contingently liable in the amount of approximately $515.1 million in issued standby letters of credit and $5.3 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. In addition, in connection with the investment activities of AECOM Capital, the Company provides guarantees of certain obligations, including guarantees for completion of projects, repayment of debt, environmental indemnity obligations and other lender required guarantees. The Company’s investment adviser jointly manages, sponsors and owns equity interest in the AECOM-Canyon Equity Fund, L.P. (the “Fund”), in which the Company has an ongoing capital commitment to fund investments. At September 30, 2018, the Company has capital commitments of $35 million to the Fund over the next 10 years. DOE Deactivation, Demolition, and Removal Project Washington Group International, an Ohio company (WGI Ohio), an affiliate of URS, 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 and remains uncompleted. In February 2011, WGI Ohio 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, requires the DOE to pay all project costs up to $106 million, requires WGI Ohio and the DOE to equally share in all project costs incurred from $106 million to $146 million, and requires WGI Ohio 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, WGI Ohio has been required to perform work outside the scope of the Task Order Modification. In December 2014, WGI Ohio submitted claims against the DOE pursuant to the Contracts Disputes Acts seeking recovery of $103 million, including additional fees on changed work scope. WGI Ohio has incurred and continues to incur additional project costs outside the scope of the contract as a result of differing site and ground conditions and intends to submit additional formal claims against the DOE. Due to significant delays and uncertainties about responsibilities for the scope of remaining work, final project completion costs and other associated costs have exceeded $100 million over the contracted and claimed amounts. WGI Ohio assets and liabilities, including the value of the above costs and claims, were measured at their fair value on October 17, 2014, the date AECOM acquired WGI Ohio’s parent company, see Note 3, which measurement has been reevaluated to account for developments pertaining to this matter. Deconstruction and decommissioning activities are completed and site restoration activities are underway. WGI Ohio increased its receivable during the quarter ended June 30, 2018. WGI Ohio can provide no certainty that it will recover the claims submitted against DOE in December 2014, any future claims or any other project costs after December 2014 that WGI Ohio may be obligated to incur including the remaining project completion costs, which could have a material adverse effect on the Company’s results of operations. SR-91 One of the Company’s wholly-owned subsidiaries, URS Corporation, entered into a partial fixed cost and partial time and material design agreement in 2012 with a design build contractor for a state route highway construction project in Riverside County and Orange County, California. On April 1, 2017, URS Corporation filed an $8.2 million amended complaint in the Superior Court of California against the design build contractor for its failure to pay for services performed under the design agreement. On July 3, 2017, the design build contractor filed an amended cross-complaint against URS Corporation and AECOM in Superior Court alleging breaches of contract, negligent interference and professional negligence pertaining to URS Corporation’s performance of design services under the design agreement, seeking purported damages of $70 million. On May 4, 2018, the design build contractor dismissed its claims for negligent interference. On May 24, 2018, URS Corporation filed an $11.9 million second amended complaint in Superior Court against the design build contractor for its failure to pay for services performed under the design agreement. URS Corporation and AECOM cannot provide assurances that URS Corporation will be successful in the recovery of the amounts owed to it under the design agreement or in their defense against the amounts alleged under the cross-complaint that they believe are without merit and that they intend to vigorously defend against. The potential range of loss in excess of any current accrual cannot be reasonably estimated at this time, primarily because the matter involves complex factual and legal issues; there is substantial uncertainty regarding any alleged damages, including due to liability of and payments, by third parties; and the matter is at a discovery stage of litigation. New York Department of Environmental Conservation The following matter is disclosed pursuant to Regulation S-K, Item 103, Instruction 5.C pertaining to a government authority environmental claim exceeding $100,000 against an AECOM affiliate. In September 2017, AECOM USA, Inc., one of the Company’s wholly-owned subsidiaries, 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 stage of the government’s claims and any negotiations of a consent order or other resolution. Illinois Power Generating Company Advatech, LLC, a joint venture 60% owned by AECOM Energy & Construction, Inc., executed a fixed-cost engineering, procurement and construction contract for a flue-gas-desulfurization system at a coal-fired power plant owned by Illinois Power Generating Company, a wholly-owned subsidiary of Dynegy, Inc. (Genco). On September 2, 2016, Genco terminated Advatech’s contract for convenience and Advatech subsequently submitted its final contractual invoice of approximately $81 million. Advatech filed and perfected a mechanics lien on the Genco power plant property on October 17, 2016. On December 9, 2016, Genco filed a voluntary petition under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the Southern District of Texas and its plan of reorganization was approved by the Bankruptcy Court on January 25, 2017 (the Bankruptcy Plan). Advatech’s contractual invoice and mechanics lien were not extinguished per the terms of the Bankruptcy Plan and remain outstanding claims. On March 15, 2017, Advatech filed a demand for arbitration and on July 21, 2017 submitted a Statement of Claim seeking reimbursement of approximately $81 million for Genco’s breach of contract and failure to reimburse Advatech for all of the cost of work performed under the contract. Advatech intends to vigorously prosecute this matter and seeks to collect all claimed amounts under the terms of the contract; however, Advatech cannot provide assurance that it will be successful in these efforts. The resolution of this matter and any potential range of loss in excess of any current accrual cannot be reasonably determined or estimated at this time, primarily because the matter has not been fully arbitrated and presents unique regulatory, bankruptcy and contractual interpretation issues.

Reportable Segments

Reportable Segments	12 Months Ended
	Sep. 30, 2018
Reportable Segments
Reportable Segments	19. Reportable Segments and Geographic Information The Company’s operations are organized into four reportable segments: Design and Consulting Services (DCS), Construction Services (CS), Management Services (MS), and AECOM Capital (ACAP). During the third quarter of fiscal 2017, operating activities of ACAP achieved a level of significance sufficient to warrant disclosure as a separate reportable segment. Prior to the third quarter of fiscal 2017, ACAP’s operating results were included in the corporate segment, and comparable periods were reclassified to reflect the change. The Company’s DCS reportable segment delivers planning, consulting, architectural, environmental, and engineering design services to commercial and government clients worldwide. The Company’s CS reportable segment provides construction services primarily in the Americas. The Company’s MS reportable segment provides program and facilities management and maintenance, training, logistics, consulting, technical assistance, and systems integration and information technology services, primarily for agencies of the U.S. government. The Company’s ACAP segment invests in real estate, public-private partnership (P3) and infrastructure projects. These reportable segments are organized by the types of services provided, 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. During the first quarter of fiscal 2017, an operation and maintenance related entity previously reported within the CS segment was realigned within the MS segment to reflect present management oversight. Accordingly, approximately $130 million of revenue and $124 million of cost of revenue for the year ended September 30, 2016 were reclassified to conform to the current period presentation. The following tables set forth summarized financial information concerning the Company’s reportable segments: Design and Consulting Construction Management AECOM Reportable Segments: Services Services Services Capital Corporate Total (in millions) Fiscal Year Ended September 30, 2018: Revenue $ 8,223.1 $ 8,238.9 $ 3,693.5 $ — $ — $ 20,155.5 Gross profit 439.2 40.4 171.0 — — 650.6 Equity in earnings of joint ventures 15.8 21.5 28.6 15.2 — 81.1 General and administrative expenses — — — (11.2) (124.5) (135.7) Impairment of assets held for sale, including goodwill — (168.2) — — — (168.2) Loss on disposal activities — (2.9) — — — (2.9) Operating income (loss) 455.0 (109.2) 199.6 4.0 (124.5) 424.9 Segment assets 7,013.8 4,212.0 2,701.2 140.6 613.5 14,681.1 Gross profit as a % of revenue 5.3 % 0.5 % 4.6 % 3.2 % Fiscal Year Ended September 30, 2017: Revenue $ 7,566.8 $ 7,295.6 $ 3,341.0 $ — $ — $ 18,203.4 Gross profit 394.8 92.9 196.0 — — 683.7 Equity in earnings of joint ventures 16.4 22.4 45.1 57.7 — 141.6 General and administrative expenses — — — (8.7) (124.7) (133.4) Acquisition and integration expenses — — — — (38.7) (38.7) Gain on disposal activities 0.6 — — — — 0.6 Operating income 411.8 115.3 241.1 49.0 (163.4) 653.8 Segment assets 6,992.6 4,114.5 2,704.6 199.1 386.2 14,397.0 Gross profit as a % of revenue 5.2 % 1.3 % 5.9 % 3.8 % Fiscal Year Ended September 30, 2016: Revenue $ 7,655.8 $ 6,371.1 $ 3,383.9 $ — $ — $ 17,410.8 Gross profit 382.5 25.4 234.9 — — 642.8 Equity in earnings of joint ventures 8.9 18.2 76.9 — — 104.0 General and administrative expenses — — — (6.0) (109.1) (115.1) Acquisition and integration expenses — — — — (213.6) (213.6) Loss on disposal activities — (42.6) — — — (42.6) Operating income 391.4 1.0 311.8 (6.0) (322.7) 375.5 Segment assets 6,655.7 3,556.2 2,692.7 179.1 586.2 13,669.9 Gross profit as a % of revenue 5.0 % 0.4 % 6.9 % 3.7 % Geographic Information: Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 Long-Lived Long-Lived Long-Lived Revenue Assets Revenue Assets Revenue Assets (in millions) United States $ 14,753.4 4,844.1 $ 13,042.6 4,779.0 $ 12,567.0 4,763.9 Asia Pacific 1,440.6 369.2 1,352.7 382.9 1,278.3 394.0 Canada 1,212.3 513.7 1,159.9 600.4 866.5 615.7 Europe 1,984.1 1,362.3 1,869.9 1,362.8 1,904.2 1,368.4 Other foreign countries 765.1 397.2 778.3 418.3 794.8 412.5 Total $ 20,155.5 7,486.5 $ 18,203.4 7,543.4 $ 17,410.8 7,554.5 The Company attributes revenue by geography based on the external customer’s country of origin. Long‑lived assets consist of noncurrent assets excluding deferred tax assets.

Major Clients

Major Clients	12 Months Ended
	Sep. 30, 2018
Major Clients
Major Clients	20. Major Clients Other than the U.S. federal government, no single client accounted for 10% or more of the Company’s revenue in any of the past five fiscal years. Approximately 23%, 22%, and 23% of the Company’s revenue was derived through direct contracts with agencies of the U.S. federal government in the years ended September 30, 2018, 2017 and 2016, respectively. One of these contracts accounted for approximately 2%, 3%, and 3% of the Company’s revenue in the years ended September 30, 2018, 2017 and 2016, respectively.

Quarterly Financial Information

Quarterly Financial Information-Unaudited	12 Months Ended
	Sep. 30, 2018
Quarterly Financial Information-Unaudited
Quarterly Financial Information-Unaudited	21. Quarterly Financial Information—Unaudited In the opinion of management, the following unaudited quarterly data reflects all adjustments necessary for a fair statement of the results of operations. All such adjustments are of a normal recurring nature. First Second Third Fourth Fiscal Year 2018: Quarter Quarter Quarter Quarter (in millions, except per share data) Revenue $ 4,910.8 $ 4,790.9 $ 5,148.0 $ 5,305.8 Cost of revenue 4,774.6 4,649.7 4,962.8 5,117.8 Gross profit 136.2 141.2 185.2 188.0 Equity in earnings of joint ventures 29.7 13.1 12.8 25.5 General and administrative expenses (34.7) (30.2) (35.1) (35.7) Impairment of assets held for sale, including goodwill — (168.2) — — Loss on disposal activities — — (2.1) (0.8) Income (loss) from operations 131.2 (44.1) 160.8 177.0 Other income 2.3 12.5 2.7 2.6 Interest expense (56.2) (100.5) (55.3) (55.5) Income (loss) before income tax (benefit) expense 77.3 (132.1) 108.2 124.1 Income tax (benefit) expense (47.1) (24.4) 33.1 18.7 Net income (loss) 124.4 (107.7) 75.1 105.4 Noncontrolling interest in income of consolidated subsidiaries, net of tax (13.1) (12.0) (14.2) (21.4) Net income (loss) attributable to AECOM $ 111.3 $ (119.7) $ 60.9 $ 84.0 Net income (loss) attributable to AECOM per share: Basic $ 0.70 $ (0.75) $ 0.38 $ 0.53 Diluted $ 0.69 $ (0.75) $ 0.37 $ 0.52 Weighted average common shares outstanding: Basic 157.9 159.5 160.4 158.6 Diluted 161.8 159.5 163.2 161.8 First Second Third Fourth Fiscal Year 2017: Quarter Quarter Quarter Quarter (in millions, except per share data) Revenue $ 4,358.3 $ 4,427.2 $ 4,561.5 $ 4,856.4 Cost of revenue 4,188.3 4,258.8 4,386.3 4,686.3 Gross profit 170.0 168.4 175.2 170.1 Equity in earnings of joint ventures 21.4 21.8 66.5 31.9 General and administrative expenses (32.6) (29.9) (34.0) (36.9) Acquisition and integration expenses (15.4) (20.0) — (3.3) Gain on disposal activities — 0.6 — — Income from operations 143.4 140.9 207.7 161.8 Other income 0.8 1.3 2.1 2.5 Interest expense (53.6) (61.8) (61.6) (54.3) Income before income tax expense (benefit) 90.6 80.4 148.2 110.0 Income tax expense (benefit) 24.8 (35.4) 12.1 6.2 Net income 65.8 115.8 136.1 103.8 Noncontrolling interest in income of consolidated subsidiaries, net of tax (18.6) (13.4) (34.8) (15.3) Net income attributable to AECOM $ 47.2 $ 102.4 $ 101.3 $ 88.5 Net income attributable to AECOM per share: Basic $ 0.31 $ 0.66 $ 0.65 $ 0.56 Diluted $ 0.30 $ 0.65 $ 0.64 $ 0.55 Weighted average common shares outstanding: Basic 154.3 155.4 155.8 157.5 Diluted 158.0 158.7 158.8 161.1

Condensed Consolidating Financi

Condensed Consolidating Financial Information	12 Months Ended
	Sep. 30, 2018
Condensed Consolidating Financial Information
Condensed Consolidating Financial Information	22. Condensed Consolidating Financial Information In connection with the registration of the Company’s 2014 Senior Notes that were declared effective by the SEC on September 29, 2015, AECOM became subject to the requirements of Rule 3-10 of Regulation S-X regarding financial statements of guarantors and issuers of guaranteed securities. Both the 2014 Senior Notes and the 2017 Senior Notes are fully and unconditionally guaranteed on a joint and several basis by certain of AECOM’s directly and indirectly 100% owned subsidiaries (the Subsidiary Guarantors). Other than customary restrictions imposed by applicable statutes, there are no restrictions on the ability of the Subsidiary Guarantors to transfer funds to AECOM in the form of cash dividends, loans or advances. The following condensed consolidating financial information, which is presented for AECOM, the Subsidiary Guarantors on a combined basis and AECOM’s non-guarantor subsidiaries on a combined basis, is provided to satisfy the disclosure requirements of Rule 3-10 of Regulation S-X. Condensed Consolidating Balance Sheets (in millions) September 30, 2018 Non- Guarantor Guarantor Parent Subsidiaries Subsidiaries Eliminations Total ASSETS CURRENT ASSETS: Total cash and cash equivalents $ 22.0 $ 270.9 $ 593.8 $ — $ 886.7 Accounts receivable—net — 2,544.7 2,924.1 — 5,468.8 Intercompany receivable 951.1 84.9 157.9 (1,193.9) — Prepaid expenses and other current assets 52.9 331.6 200.7 — 585.2 Current assets held for sale — — 59.8 — 59.8 Income taxes receivable 84.6 — 42.2 — 126.8 TOTAL CURRENT ASSETS 1,110.6 3,232.1 3,978.5 (1,193.9) 7,127.3 PROPERTY AND EQUIPMENT—NET 202.6 217.3 194.2 — 614.1 DEFERRED TAX ASSETS—NET 134.0 — 150.0 (124.6) 159.4 INVESTMENTS IN CONSOLIDATED SUBSIDIARIES 6,364.1 1,912.0 — (8,276.1) — INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES 13.4 49.6 247.7 — 310.7 GOODWILL — 3,392.7 2,528.4 — 5,921.1 INTANGIBLE ASSETS—NET — 218.6 101.3 — 319.9 OTHER NON-CURRENT ASSETS 49.9 45.6 133.1 — 228.6 TOTAL ASSETS $ 7,874.6 $ 9,067.9 $ 7,333.2 $ (9,594.6) $ 14,681.1 LIABILITIES AND STOCKHOLDERS’ EQUITY CURRENT LIABILITIES: Short-term debt $ 8.4 $ — $ — $ — $ 8.4 Accounts payable 53.6 1,616.7 1,055.7 — 2,726.0 Accrued expenses and other current liabilities 58.8 1,035.6 1,172.7 — 2,267.1 Income taxes payable 10.4 — 29.4 — 39.8 Intercompany payable 105.5 830.8 416.9 (1,353.2) — Billings in excess of costs on uncompleted contracts 1.5 316.1 613.8 — 931.4 Current liabilities held for sale — — 22.3 — 22.3 Current portion of long-term debt 43.3 27.0 64.4 — 134.7 TOTAL CURRENT LIABILITIES 281.5 3,826.2 3,375.2 (1,353.2) 6,129.7 OTHER LONG-TERM LIABILITIES 131.6 249.0 361.5 — 742.1 DEFERRED TAX LIABILITY—NET — 63.1 108.9 (124.7) 47.3 NOTE PAYABLE INTERCOMPANY—NON CURRENT 800.9 — 487.5 (1,288.4) — LONG‑TERM DEBT 2,627.8 291.4 564.5 — 3,483.7 TOTAL LIABILITIES 3,841.8 4,429.7 4,897.6 (2,766.3) 10,402.8 TOTAL AECOM STOCKHOLDERS’ EQUITY 4,032.8 4,638.2 2,250.1 (6,828.3) 4,092.8 Noncontrolling interests — — 185.5 — 185.5 TOTAL STOCKHOLDERS’ EQUITY 4,032.8 4,638.2 2,435.6 (6,828.3) 4,278.3 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 7,874.6 $ 9,067.9 $ 7,333.2 $ (9,594.6) $ 14,681.1 Condensed Consolidating Balance Sheets (in millions) September 30, 2017 Non- Guarantor Guarantor Parent Subsidiaries Subsidiaries Eliminations Total ASSETS CURRENT ASSETS: Total cash and cash equivalents $ 32.6 $ 254.9 $ 514.9 $ — $ 802.4 Accounts receivable—net — 2,426.4 2,701.3 — 5,127.7 Intercompany receivable 723.6 89.0 183.4 (996.0) — Prepaid expenses and other current assets 67.5 366.5 262.7 — 696.7 Income taxes receivable 4.3 — 51.1 — 55.4 TOTAL CURRENT ASSETS 828.0 3,136.8 3,713.4 (996.0) 6,682.2 PROPERTY AND EQUIPMENT—NET 160.2 215.0 246.2 — 621.4 DEFERRED TAX ASSETS—NET 239.7 61.7 164.5 (294.6) 171.3 INVESTMENTS IN CONSOLIDATED SUBSIDIARIES 6,606.2 2,812.8 — (9,419.0) — INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES 7.2 69.7 287.3 — 364.2 GOODWILL — 3,392.7 2,600.2 — 5,992.9 INTANGIBLE ASSETS—NET — 271.6 143.5 — 415.1 OTHER NON-CURRENT ASSETS 8.7 47.4 93.8 — 149.9 TOTAL ASSETS $ 7,850.0 $ 10,007.7 $ 7,248.9 $ (10,709.6) $ 14,397.0 LIABILITIES AND STOCKHOLDERS’ EQUITY CURRENT LIABILITIES: Short-term debt $ 1.1 $ — $ 0.1 $ — $ 1.2 Accounts payable 33.8 1,301.7 914.4 — 2,249.9 Accrued expenses and other current liabilities 92.2 1,171.8 981.5 — 2,245.5 Income taxes payable — 8.1 30.1 — 38.2 Intercompany payable 149.2 789.5 159.6 (1,098.3) — Billings in excess of costs on uncompleted contracts 3.4 341.7 557.7 — 902.8 Current portion of long-term debt 110.9 14.9 15.0 — 140.8 TOTAL CURRENT LIABILITIES 390.6 3,627.7 2,658.4 (1,098.3) 5,578.4 OTHER LONG-TERM LIABILITIES 102.3 290.7 488.3 — 881.3 DEFERRED TAX LIABILITY—NET — 0.6 314.5 (294.6) 20.5 NOTE PAYABLE INTERCOMPANY—NON CURRENT 0.1 — 467.2 (467.3) — LONG-TERM DEBT 3,366.9 281.6 53.6 — 3,702.1 TOTAL LIABILITIES 3,859.9 4,200.6 3,982.0 (1,860.2) 10,182.3 TOTAL AECOM STOCKHOLDERS’ EQUITY 3,990.1 5,807.1 3,048.3 (8,849.4) 3,996.1 Noncontrolling interests — — 218.6 — 218.6 TOTAL STOCKHOLDERS’ EQUITY 3,990.1 5,807.1 3,266.9 (8,849.4) 4,214.7 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 7,850.0 $ 10,007.7 $ 7,248.9 $ (10,709.6) $ 14,397.0 Condensed Consolidating Statements of Operations (in millions) For the Fiscal Year Ended September 30, 2018 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Revenue $ — $ 11,052.9 $ 9,212.9 $ (110.3) $ 20,155.5 Cost of revenue — 10,757.2 8,858.0 (110.3) 19,504.9 Gross profit — 295.7 354.9 — 650.6 Equity in earnings from subsidiaries 460.9 207.2 — (668.1) — Equity in earnings of joint ventures — 37.2 43.9 — 81.1 General and administrative expenses (124.4) — (11.3) — (135.7) Impairment on assets held for sale, including goodwill — — (168.2) — (168.2) Loss on disposal activities — — (2.9) — (2.9) Income from operations 336.5 540.1 216.4 (668.1) 424.9 Other income 12.0 34.5 12.7 (39.1) 20.1 Interest expense (242.9) (25.1) (38.6) 39.1 (267.5) Income before income tax (benefit) expense 105.6 549.5 190.5 (668.1) 177.5 Income tax (benefit) expense (31.1) 98.8 (87.4) — (19.7) Net income 136.7 450.7 277.9 (668.1) 197.2 Noncontrolling interests in income of consolidated subsidiaries, net of tax — — (60.7) — (60.7) Net income attributable to AECOM $ 136.7 $ 450.7 $ 217.2 $ (668.1) $ 136.5 For the Fiscal Year Ended September 30, 2017 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Revenue $ — $ 10,491.6 $ 7,764.1 $ (52.3) $ 18,203.4 Cost of revenue — 10,136.1 7,435.9 (52.3) 17,519.7 Gross profit — 355.5 328.2 — 683.7 Equity in earnings from subsidiaries 439.3 222.4 — (661.7) — Equity in earnings of joint ventures — 43.8 97.8 — 141.6 General and administrative expenses (124.7) — (8.7) — (133.4) Acquisition and integration expenses (38.7) — — — (38.7) Gain on disposal activities — — 0.6 — 0.6 Income from operations 275.9 621.7 417.9 (661.7) 653.8 Other income 2.1 31.9 9.2 (36.5) 6.7 Interest expense (203.7) (31.1) (33.0) 36.5 (231.3) Income before income tax (benefit) expense 74.3 622.5 394.1 (661.7) 429.2 Income tax (benefit) expense (264.9) 182.5 58.4 31.7 7.7 Net income 339.2 440.0 335.7 (693.4) 421.5 Noncontrolling interests in income of consolidated subsidiaries, net of tax — — (82.1) — (82.1) Net income attributable to AECOM $ 339.2 $ 440.0 $ 253.6 $ (693.4) $ 339.4 Condensed Consolidating Statements of Operations (in millions) For the Fiscal Year Ended September 30, 2016 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Revenue $ — $ 10,182.1 $ 7,310.7 $ (82.0) $ 17,410.8 Cost of revenue — 9,864.3 6,985.7 (82.0) 16,768.0 Gross profit — 317.8 325.0 — 642.8 Equity in earnings from subsidiaries 437.4 242.7 — (680.1) — Equity in earnings of joint ventures — 38.4 65.6 — 104.0 General and administrative expenses (114.0) (1.1) — — (115.1) Acquisition and integration expenses (213.6) — — — (213.6) Loss on disposal activities — — (42.6) — (42.6) Income from operations 109.8 597.8 348.0 (680.1) 375.5 Other income 0.8 34.7 12.7 (40.0) 8.2 Interest expense (231.7) (29.0) (37.4) 40.0 (258.1) (Loss) income before income tax (benefit) expense (121.1) 603.5 323.3 (680.1) 125.6 Income tax (benefit) expense (217.3) 118.7 23.4 37.3 (37.9) Net income 96.2 484.8 299.9 (717.4) 163.5 Noncontrolling interests in income of consolidated subsidiaries, net of tax — — (67.4) — (67.4) Net income attributable to AECOM $ 96.2 $ 484.8 $ 232.5 $ (717.4) $ 96.1 Consolidating Statements of Comprehensive Income (Loss) (in millions) For the Fiscal Year Ended September 30, 2018 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Net income $ 136.7 $ 450.7 $ 277.9 $ (668.1) $ 197.2 Other comprehensive income (loss), net of tax: Net unrealized gain (loss) on derivatives, net of tax 2.3 — (0.6) — 1.7 Foreign currency translation adjustments — — (82.7) — (82.7) Pension adjustments, net of tax 5.0 10.8 63.7 — 79.5 Other comprehensive income (loss), net of tax 7.3 10.8 (19.6) — (1.5) Comprehensive income, net of tax 144.0 461.5 258.3 (668.1) 195.7 Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax — — (61.9) — (61.9) Comprehensive income attributable to AECOM, net of tax $ 144.0 $ 461.5 $ 196.4 $ (668.1) $ 133.8 For the Fiscal Year Ended September 30, 2017 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Net income $ 339.2 $ 440.0 $ 335.7 $ (693.4) $ 421.5 Other comprehensive income (loss), net of tax: Net unrealized gain (loss) on derivatives, net of tax 4.9 — (0.3) — 4.6 Foreign currency translation adjustments — — 65.4 — 65.4 Pension adjustments, net of tax 7.1 13.8 66.1 — 87.0 Other comprehensive income, net of tax 12.0 13.8 131.2 — 157.0 Comprehensive income, net of tax 351.2 453.8 466.9 (693.4) 578.5 Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax — — (82.2) — (82.2) Comprehensive income attributable to AECOM, net of tax $ 351.2 $ 453.8 $ 384.7 $ (693.4) $ 496.3 For the Fiscal Year Ended September 30, 2016 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Net income $ 96.2 $ 484.8 $ 299.9 $ (717.4) $ 163.5 Other comprehensive income (loss), net of tax: Net unrealized gain on derivatives, net of tax 2.6 — 3.4 — 6.0 Foreign currency translation adjustments — — (65.3) — (65.3) Pension adjustments, net of tax (3.3) (14.9) (146.7) — (164.9) Other comprehensive loss, net of tax (0.7) (14.9) (208.6) — (224.2) Comprehensive income (loss), net of tax 95.5 469.9 91.3 (717.4) (60.7) Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax — — (65.7) — (65.7) Comprehensive income (loss) attributable to AECOM, net of tax $ 95.5 $ 469.9 $ 25.6 $ (717.4) $ (126.4) Condensed Consolidating Statements of Cash Flows (in millions) For the Fiscal Year Ended September 30, 2018 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES $ (205.5) $ 640.9 $ 339.1 $ — $ 774.5 CASH FLOWS FROM INVESTING ACTIVITIES: Proceeds from purchase price adjustment to business acquisition — — 2.2 — 2.2 Cash acquired from consolidation of joint venture — — 7.6 — 7.6 Proceeds from disposal of business, net of cash disposed — — 19.5 — 19.5 Net investment in unconsolidated joint ventures (6.1) (9.1) 30.0 — 14.8 Net purchases of investments — — (16.3) — (16.3) Payments for capital expenditures, net of disposals (29.3) (39.1) (18.5) — (86.9) Net investment in intercompany notes (54.3) (778.8) (5.6) 838.7 — Other intercompany investing activities 528.2 1,022.1 — (1,550.3) — Net cash provided by investing activities 438.5 195.1 18.9 (711.6) (59.1) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from borrowings under credit agreements 7,770.4 0.2 758.4 — 8,529.0 Repayments of borrowings under credit agreements (7,820.0) (18.0) (202.2) — (8,040.2) Redemption of unsecured senior notes (800.0) — — — (800.0) Prepayment penalty on unsecured senior notes (34.5) — — — (34.5) Cash paid for debt issuance costs (12.2) — — — (12.2) Proceeds from issuance of common stock 35.2 — — — 35.2 Proceeds from exercise of stock options 2.8 — — — 2.8 Payments to repurchase common stock under the share repurchase Program (150.0) — — — (150.0) Payments to repurchase common stock (29.5) — — — (29.5) Net distributions to noncontrolling interests — — (89.8) — (89.8) Other financing activities (3.6) (22.4) (9.7) — (35.7) Net borrowings on intercompany notes 797.8 5.9 35.0 (838.7) — Other intercompany financing activities — (785.7) (764.6) 1,550.3 — Net cash used in financing activities (243.6) (820.0) (272.9) 711.6 (624.9) EFFECT OF EXCHANGE RATE CHANGES ON CASH — — (6.2) — (6.2) NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (10.6) 16.0 78.9 — 84.3 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 32.6 254.9 514.9 — 802.4 CASH AND CASH EQUIVALENTS AT END OF YEAR $ 22.0 $ 270.9 $ 593.8 $ — $ 886.7 For the Fiscal Year Ended September 30, 2017 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES $ (5.9) $ 695.0 $ 7.6 $ — $ 696.7 CASH FLOWS FROM INVESTING ACTIVITIES: Payments for business acquisitions, net of cash acquired — — (103.1) — (103.1) Proceeds from disposal of business, net of cash disposed — — 2.2 — 2.2 Net investment in unconsolidated joint ventures — (2.7) (21.6) — (24.3) Net purchases of investments — — 0.9 — 0.9 Payments for capital expenditures, net of disposals (21.7) (30.6) (26.1) — (78.4) Net (investment in) reciepts from intercompany notes (4.6) 102.8 12.2 (110.4) — Other intercompany investing activities 139.0 (233.2) — 94.2 — Net cash provided by (used in) investing activities 112.7 (163.7) (135.5) (16.2) (202.7) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from borrowings under credit agreements 5,903.5 13.1 36.6 — 5,953.2 Repayments of borrowings under credit agreements (6,956.3) (51.1) (64.2) — (7,071.6) Issuance of unsecured senior notes 1,000.0 — — — 1,000.0 Redemption of unsecured senior notes — (179.2) — — (179.2) Cash paid for debt and equity issuance costs (13.0) — — — (13.0) Proceeds from issuance of common stock 30.1 — — — 30.1 Proceeds from exercise of stock options 4.9 — — — 4.9 Payments to repurchase common stock (25.1) — — — (25.1) Net distributions to noncontrolling interests — — (59.0) — (59.0) Other financing activities (24.1) (38.3) 35.6 — (26.8) Net borrowings (repayments) on intercompany notes 4.0 (16.3) (98.1) 110.4 — Other intercompany financing activities — (200.9) 295.1 (94.2) — Net cash provided by (used in) financing activities (76.0) (472.7) 146.0 16.2 (386.5) EFFECT OF EXCHANGE RATE CHANGES ON CASH — — 2.8 — 2.8 NET INCREASE IN CASH AND CASH EQUIVALENTS 30.8 58.6 20.9 — 110.3 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 1.8 196.3 494.0 — 692.1 CASH AND CASH EQUIVALENTS AT END OF YEAR $ 32.6 $ 254.9 $ 514.9 $ — $ 802.4 Condensed Consolidating Statements of Cash Flows (in millions) For the Fiscal Year Ended September 30, 2016 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES $ (273.6) $ 639.0 $ 448.8 $ — $ 814.2 CASH FLOWS FROM INVESTING ACTIVITIES: Payments for business acquisitions, net of cash acquired — (1.0) (4.5) — (5.5) Proceeds from disposal of businesses and property — — 39.7 — 39.7 Net investment in unconsolidated joint ventures — (3.1) (68.4) — (71.5) Net purchases of investments — — 11.5 — 11.5 Payments for capital expenditures, net of disposals (82.0) (59.5) 4.7 — (136.8) Net receipts from (investment in) intercompany notes 5.3 176.1 (13.5) (167.9) — Other intercompany investing activities 791.2 140.3 — (931.5) — Net cash provided by (used in) investing activities 714.5 252.8 (30.5) (1,099.4) (162.6) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from borrowings under credit agreements 4,673.0 17.6 15.6 — 4,706.2 Repayments of borrowings under credit agreements (5,124.1) (22.8) (53.1) — (5,200.0) Cash paid for debt and equity issuance costs (10.4) — — — (10.4) Proceeds from issuance of common stock 28.2 — — — 28.2 Proceeds from exercise of stock options 9.9 — — — 9.9 Payments to repurchase common stock (25.9) — — — (25.9) Net distributions to noncontrolling interests — — (103.2) — (103.2) Other financing activities 7.9 (4.5) (46.3) — (42.9) Net borrowings (repayments) on intercompany notes 1.0 12.5 (181.4) 167.9 — Other intercompany financing activities — (867.6) (63.9) 931.5 — Net cash used in financing activities (440.4) (864.8) (432.3) 1,099.4 (638.1) EFFECT OF EXCHANGE RATE CHANGES ON CASH — — (5.3) — (5.3) NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0.5 27.0 (19.3) — 8.2 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 1.3 169.3 513.3 — 683.9 CASH AND CASH EQUIVALENTS AT END OF YEAR $ 1.8 $ 196.3 $ 494.0 $ — $ 692.1

Schedule II_ Valuation and Qual

Schedule II: Valuation and Qualifying Accounts	12 Months Ended
	Sep. 30, 2018
Schedule II: Valuation and Qualifying Accounts
Schedule II: Valuation and Qualifying Accounts	Schedule II: Valuation and Qualifying Accounts (amounts in millions) Balance at Additions Other and Balance at Beginning Charged to Cost Foreign the End of of Year of Revenue Deductions (a) Exchange Impact the Year Allowance for Doubtful Accounts Fiscal Year 2018 $ 52.2 $ 18.3 $ (17.5) $ (1.4) $ 51.6 Fiscal Year 2017 $ 60.4 $ 13.1 $ (20.7) $ (0.6) $ 52.2 Fiscal Year 2016 $ 64.1 $ 16.4 $ (20.5) $ 0.4 $ 60.4 (a) Primarily relates to accounts written-off and recoveries

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2018
Significant Accounting Policies
Fiscal Year	Fiscal Year —The Company reports results of operations based on 52 or 53-week periods ending on the Friday nearest September 30. For clarity of presentation, all periods are presented as if the year ended on September 30. Fiscal years 2018, 2017 and 2016 each contained 52 weeks and ended on September 28, September 29, and September 30, respectively.
Use of Estimates	Use of Estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The more significant estimates affecting amounts reported in the consolidated financial statements relate to revenues under long‑term contracts and self‑insurance accruals. Actual results could differ from those estimates.
Principles of Consolidation and Presentation	Principles of Consolidation and Presentation —The consolidated financial statements include the accounts of all majority‑owned subsidiaries and joint ventures in which the Company is the primary beneficiary. All inter‑company accounts have been eliminated in consolidation. Also see Note 6 regarding joint ventures and variable interest entities.
Revenue Recognition	Revenue Recognition —The Company generally utilizes a cost-to-cost approach in applying the percentage-of-completion method of revenue recognition. Under this approach, revenue is earned in proportion to total costs incurred, divided by total costs expected to be incurred. 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, engineering progress, material quantities, the achievement of milestones, penalty provisions, labor productivity and cost estimates made at the balance sheet date. Due to uncertainties inherent in the estimation process, actual completion costs may vary from estimates. If estimated total costs on contracts indicate a loss, the Company recognizes that estimated loss within cost of revenues in the period the estimated loss first becomes known. Liabilities recorded related to accrued contract losses were not material as of September 30, 2018 and 2017. 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 industry practice and GAAP, are included in the Company’s revenue and cost of revenue. Because subcontractor services and other direct costs can change significantly from project to project and period to period, changes in revenue may not be indicative of business trends. These subcontractor and other direct costs for the years ended September 30, 2018, 2017 and 2016 were $10.7 billion, $9.2 billion and $8.4 billion, respectively. Cost-Reimbursable Contracts Cost-reimbursable contracts consists of two similar contract types: (1) cost-plus contracts and (2) time-and-materials price contracts. Cost‑Plus Contracts. The Company enters into two major types of cost‑plus contracts: Cost‑Plus Fixed Fee. Under cost‑plus fixed fee contracts, the Company charges clients for its costs, including both direct and indirect costs, plus a fixed negotiated fee. The total estimated cost plus the fixed negotiated fee represents the total contract value. The Company recognizes revenue based on the actual labor and other direct costs incurred, plus the portion of the fixed fee it has earned to date. Cost‑Plus Fixed Rate. Under the Company’s cost‑plus fixed rate contracts, the Company charges clients for its direct and indirect costs based upon a negotiated rate. The Company recognizes revenue based on the actual total costs it has expended and the applicable fixed rate. Certain cost‑plus contracts provide for award fees or a penalty based on performance criteria in lieu of a fixed fee or fixed rate. Other contracts include a base fee component plus a performance‑based award fee. In addition, the Company may share award fees with subcontractors. The Company records accruals for fee‑sharing as fees are earned. The Company generally recognizes revenue to the extent of costs actually incurred plus a proportionate amount of the fee expected to be earned. The Company takes the award fee or penalty on contracts into consideration when estimating revenue and profit rates, and it records revenue related to the award fees when there is sufficient information to assess anticipated contract performance. On contracts that represent higher than normal risk or technical difficulty, the Company may defer all award fees until an award fee letter is received. Once an award fee letter is received, the estimated or accrued fees are adjusted to the actual award amount. Certain cost‑plus contracts provide for incentive fees based on performance against contractual milestones. The amount of the incentive fees varies, depending on whether the Company achieves above, at, or below target results. The Company originally recognizes revenue on these contracts based upon expected results. These estimates are revised when necessary based upon additional information that becomes available as the contract progresses. Time‑and‑Materials Price Contracts Time‑and‑Materials Price Contracts. Under time‑and‑materials 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 its actual out‑of‑pocket costs of materials and other direct incidental expenditures that it incurs in connection with its performance under the contract. Profit margins on time‑and‑materials contracts fluctuate based on actual labor and overhead costs that it directly charges or allocates to contracts compared to negotiated billing rates. Many of the Company’s time‑and‑materials contracts are subject to maximum contract values and, accordingly, revenue relating to these contracts is recognized as if these contracts were a fixed‑price contract. Guaranteed Maximum Price Contracts Guaranteed Maximum Price. Guaranteed maximum price contracts (GMP) are common for design-build and commercial and residential projects. GMP contracts share many of the same contract provisions as cost-plus and fixed-price contracts. A contractor performing work pursuant to a cost-plus, GMP or fixed-price contract will all enter into trade contracts directly. Both cost-plus and GMP contracts generally include an agreed lump sum or percentage fee which is called out and separately identified and the contracts are considered ‘open’ book providing the owner with full disclosure of the project costs. A fixed-price contract provides the owner with a single lump sum amount without specifically identifying the breakdown of fee or costs and is typically ‘closed’ book thereby providing the owner with little detail as to the project costs. In a GMP contract, unlike the cost-plus contract, the Company provides the owner with a guaranteed price for the overall construction (adjusted for change orders issued by the owner) and with a schedule which includes a completion date for the project. In addition, cost overruns in a GMP contract would generally be the Company’s responsibility and in the event the Company’s actions or inactions result in delays to the project, the Company may be responsible to the owner for costs associated with such delay. For many of the Company’s commercial and residential GMP contracts, the final price is generally not established until the Company have awarded a substantial percentage of the trade contracts and it has negotiated additional contractual limitations, such as mutual waivers of consequential damages as well as aggregate caps on liabilities and liquidated damages. Fixed‑Price Contracts Fixed‑Price. Fixed‑price contracting is the predominant contracting method outside of the United States. There are typically two types of fixed‑price contracts. The first and more common type, lump‑sum, involves performing all of the work under the contract for a specified lump‑sum fee. Lump‑sum contracts are typically subject to price adjustments if the scope of the project changes or unforeseen conditions arise. The second type, fixed‑unit price, involves performing an estimated 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. The Company recognizes revenue on fixed‑price contracts using the percentage‑of‑completion method described above. Prior to completion, recognized profit margins on any fixed‑price contract depend on the accuracy of the Company’s estimates and will increase to the extent that its actual costs are below the estimated amounts. Conversely, if the Company’s costs exceed these estimates, its profit margins will decrease and the Company may realize a loss on a project. The Company recognizes anticipated losses on contracts in the period in which they become evident. During the years ended September 30, 2018, 2017 and 2016, the types of contracts comprising the Company’s revenue were as follows: Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 Cost reimbursable 47 % 48 % 53 % Guaranteed maximum price 23 % 23 % 15 % Fixed price 30 % 29 % 32 % Cost-reimbursable contracts include cost-plus and time-and-materials price contracts. Contract Claims —Claims are amounts in excess of the agreed contract price (or amounts not included in the original contract price) that the Company seeks to collect from customers or others for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price or other causes of unanticipated additional costs. The Company records contract revenue related to claims only if it is probable that the claim will result in additional contract revenue and if the amount can be reliably estimated. In such cases, the Company records revenue only to the extent that contract costs relating to the claim have been incurred.
Government Contract Matters	Government Contract Matters —The Company’s federal government and certain state and local agency contracts are subject to, among other regulations, regulations issued under the Federal Acquisition Regulations (FAR). These regulations can limit the recovery of certain specified indirect costs on contracts and subjects the Company to ongoing multiple audits by government agencies such as the Defense Contract Audit Agency (DCAA). In addition, most of the Company’s federal and state and local contracts are subject to termination at the discretion of the client. Audits by the DCAA and other agencies consist of reviews of the Company’s overhead rates, operating systems and cost proposals to ensure that the Company accounted for such costs in accordance with the Cost Accounting Standards of the FAR (CAS). If the DCAA determines the Company has not accounted for such costs consistent with CAS, the DCAA may disallow these costs. There can be no assurance that audits by the DCAA or other governmental agencies will not result in material cost disallowances in the future.
Cash and Cash Equivalents	Cash and Cash Equivalents —The Company’s cash equivalents include highly liquid investments which have an initial maturity of three months or less.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts —The Company records its accounts receivable net of an allowance for doubtful accounts. This allowance for doubtful accounts is estimated based on management’s evaluation of the contracts involved and the financial condition of its clients. The factors the Company considers in its contract evaluations include, but are not limited to: · Client type—federal or state and local government or commercial client; · Historical contract performance; · Historical collection and delinquency trends; · Client credit worthiness; and · General economic conditions.
Derivative Financial Instruments	Derivative Financial Instruments —The Company accounts for its derivative instruments as either assets or liabilities and carries them at fair value. For derivative instruments that hedge the exposure to variability in expected future cash flows that are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income in stockholders’ equity and reclassified into income in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument, if any, is recognized in current income. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions. The net gain or loss on the effective portion of a derivative instrument that is designated as an economic hedge of the foreign currency translation exposure generated by the re‑measurement of certain assets and liabilities denominated in a non‑functional currency in a foreign operation is reported in the same manner as a foreign currency translation adjustment. Accordingly, any gains or losses related to these derivative instruments are recognized in current income. Derivatives that do not qualify as hedges are adjusted to fair value through current income.
Fair Value of Financial Instruments	Fair Value of Financial Instruments —The Company determines the fair values of its financial instruments, including short‑term investments, debt instruments and derivative instruments, and pension and post‑retirement plan assets based on inputs or assumptions that market participants would use in pricing an asset or a liability. The Company categorizes its instruments using a valuation hierarchy for disclosure of the inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; Level 3 inputs are unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. The classification of a financial asset or liability within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturities of these instruments. The carrying amount of the revolving credit facility approximates fair value because the interest rates are based upon variable reference rates. The Company’s fair value measurement methods may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Although the Company believes its valuation methods are appropriate and consistent with those used by other market participants, the use of different methodologies or assumptions to determine fair value could result in a different fair value measurement at the reporting date.
Property and Equipment	Property and Equipment —Property and equipment are recorded at cost and are depreciated over their estimated useful lives using the straight‑line method. Expenditures for maintenance and repairs are expensed as incurred. Typically, estimated useful lives range from ten to forty-five years for buildings, three to ten years for furniture and fixtures and three to twelve years for computer systems and equipment. Leasehold improvements are amortized on a straight‑line basis over the shorter of their estimated useful lives or the remaining terms of the underlying lease agreement.
Long-lived Assets	Long-lived Assets —Long-lived assets to be held and used are reviewed for impairment whenever events or circumstances indicate that the assets may not be recoverable. The carrying amount of an asset to be held and used is not recoverable if it exceeds the sum of the undiscounted cash flows expected from the use and eventual disposition of the asset. For assets to be held and used, impairment losses are recognized based upon the excess of the asset’s carrying amount over the fair value of the asset. For long-lived assets to be disposed, impairment losses are recognized at the lower of the carrying amount or fair value less cost to sell.
Goodwill and Acquired Intangible Assets	Goodwill and Acquired Intangible Assets —Goodwill represents the excess of amounts paid over the fair value of net assets acquired from an acquisition. In order to determine the amount of goodwill resulting from an acquisition, the Company performs an assessment to determine the value of the acquired company’s tangible and identifiable intangible assets and liabilities. In its assessment, the Company determines whether identifiable intangible assets exist, which typically include backlog and customer relationships. Intangible assets are amortized over the period in which the contractual or economic benefits of the intangible assets are expected to be realized. The Company tests goodwill for impairment annually for each reporting unit in the fourth quarter of the fiscal year and between annual tests, if events occur or circumstances change which suggest that goodwill should be evaluated. Such events or circumstances include significant changes in legal factors and business climate, recent losses at a reporting unit, and industry trends, among other factors. A reporting unit is defined as an operating segment or one level below an operating segment. The Company’s impairment tests are performed at the operating segment level as they represent the Company’s reporting units. During the impairment test, the Company estimates the fair value of the reporting unit using income and market approaches, and compares that amount to the carrying value of that reporting unit. In the event the fair value of the reporting unit is determined to be less than the carrying value, goodwill is impaired, and an impairment loss is recognized equal to the excess, limited to the total amount of goodwill allocated to the reporting unit. See also Note 3.
Pension Plans	Pension Plans —The Company has certain defined benefit pension plans. The Company calculates the market‑related value of assets, which is used to determine the return‑on‑assets component of annual pension expense and the cumulative net unrecognized gain or loss subject to amortization. This calculation reflects the Company’s anticipated long‑term rate of return and amortization of the difference between the actual return (including capital, dividends, and interest) and the expected return over a five-year period. Cumulative net unrecognized gains or losses that exceed 10% of the greater of the projected benefit obligation or the market related value of plan assets are subject to amortization.
Insurance Reserves	Insurance Reserves —The Company maintains insurance for certain insurable business risks. Insurance coverage contains various retention and deductible amounts for which the Company accrues a liability based upon reported claims and an actuarially determined estimated liability for certain claims incurred but not reported. It is generally the Company’s policy not to accrue for any potential legal expense to be incurred in defending the Company’s position. The Company believes that its accruals for estimated liabilities associated with professional and other liabilities are sufficient and any excess liability beyond the accrual is not expected to have a material adverse effect on the Company’s results of operations or financial position.
Foreign Currency Translation	Foreign Currency Translation —The Company’s functional currency is generally the U.S. dollar, except for foreign operations where the functional currency is generally the local currency. Results of operations for foreign entities are translated to U.S. dollars using the average exchange rates during the period. Assets and liabilities for foreign entities are translated using the exchange rates in effect as of the date of the balance sheet. Resulting translation adjustments are recorded as a foreign currency translation adjustment into other accumulated comprehensive income/(loss) in stockholders’ equity. The Company uses foreign currency forward contracts from time to time to mitigate foreign currency risk. The Company limits exposure to foreign currency fluctuations in most of its contracts through provisions that require client payments in currencies corresponding to the currency in which costs are incurred. As a result of this natural hedge, the Company generally does not need to hedge foreign currency cash flows for contract work performed.
Noncontrolling Interests	Noncontrolling Interests —Noncontrolling interests represent the equity investments of the minority owners in the Company’s joint ventures and other subsidiary entities that the Company consolidates in its financial statements.
Income Taxes	Income Taxes— The Company files a consolidated U.S. federal corporate income tax return and combined / consolidated state tax returns and separate company state tax returns. The Company accounts for certain income and expense items differently for financial reporting and income tax purposes. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. In determining the need for a valuation allowance, management reviews both positive and negative evidence, including the nature, frequency, and severity of cumulative financial reporting losses in recent years, the future reversal of existing temporary differences, predictability of future taxable income exclusive of reversing temporary differences of the character necessary to realize the asset, relevant carryforward periods, taxable income in carry-back years if carry-back is permitted under tax law, and prudent and feasible tax planning strategies that would be implemented, if necessary, to protect against the loss of the deferred tax asset that would otherwise expire. Based upon management’s assessment of all available evidence, the Company has concluded that it is more likely than not that the deferred tax assets, net of valuation allowance, will be realized.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2018
Significant Accounting Policies
Schedule of types of contracts comprising Company's revenues	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 Cost reimbursable 47 % 48 % 53 % Guaranteed maximum price 23 % 23 % 15 % Fixed price 30 % 29 % 32 %

Business Acquisitions, Goodwi_2

Business Acquisitions, Goodwill and Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2018
Business Acquisitions, Goodwill and Intangible Assets
Schedule of acquisition and integration expenses	Acquisition and integration expenses, relating to business acquisitions, in the accompanying consolidated statements of operations are comprised of the following (in millions): Fiscal Year Ended Sept 30, 2017 Severance and personnel costs $ 32.0 Professional services, real estate-related, and other expenses 6.7 Total $ 38.7
Schedule of changes in the carrying value of goodwill by reportable segment	Fiscal Year 2018 Measurement Foreign September 30, Period Exchange September 30, 2017 Adjustment Impairment Impact 2018 (in millions) Design and Consulting Services $ 3,218.9 $ — $ — $ (29.7) $ 3,189.2 Construction Services 1,049.9 91.0 (125.4) (6.6) 1,008.9 Management Services 1,724.1 — — (1.1) 1,723.0 Total $ 5,992.9 $ 91.0 $ (125.4) $ (37.4) $ 5,921.1 Fiscal Year 2017 Foreign September 30, Exchange September 30, 2016 Acquisition Disposed Impact 2017 (in millions) Design and Consulting Services $ 3,198.2 $ 3.8 $ (1.8) $ 18.7 $ 3,218.9 Construction Services 915.2 123.3 — 11.4 1,049.9 Management Services 1,710.4 — — 13.7 1,724.1 Total $ 5,823.8 $ 127.1 $ (1.8) $ 43.8 $ 5,992.9
Schedule of finite-lived intangible assets by major class	September 30, 2018 September 30, 2017 Amortization Gross Accumulated Intangible Gross Accumulated Intangible Period Amount Amortization Assets, Net Amount Amortization Assets, Net (years) (in millions) Backlog and customer relationships $ 1,285.1 $ (966.0) $ 319.1 $ 1,283.6 $ (870.2) $ 413.4 1 - 11 Trademark / tradename 18.3 (17.5) 0.8 18.3 (16.6) 1.7 0.3 - 2 Total $ 1,303.4 $ (983.5) $ 319.9 $ 1,301.9 $ (886.8) $ 415.1
Schedule of estimated future amortization expense of intangible assets	Fiscal Year (in millions) 2019 $ 83.7 2020 69.8 2021 56.8 2022 44.0 2023 39.5 Thereafter 26.1 Total $ 319.9

Accounts Receivable - Net (Tabl

Accounts Receivable - Net (Tables)	12 Months Ended
	Sep. 30, 2018
Accounts Receivable - Net
Schedule of net accounts receivable	Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Billed $ 2,697.7 $ 2,317.8 Unbilled 2,161.0 2,293.5 Contract retentions 661.7 568.6 Total accounts receivable—gross 5,520.4 5,179.9 Allowance for doubtful accounts (51.6) (52.2) Total accounts receivable—net $ 5,468.8 $ 5,127.7

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Sep. 30, 2018
Property and Equipment
Schedule of property and equipment, at cost	Fiscal Year Ended September 30, September 30, Useful Lives 2018 2017 (years) (in millions) Building and land $ 75.2 $ 63.6 10 - 45 Leasehold improvements 399.2 404.6 1 - 20 Computer systems and equipment 741.2 694.6 3 - 12 Furniture and fixtures 132.5 135.9 3 - 10 Total 1,348.1 1,298.7 Accumulated depreciation and amortization (734.0) (677.3) Property and equipment, net $ 614.1 $ 621.4

Joint Ventures and Variable I_2

Joint Ventures and Variable Interest Entities (Tables)	12 Months Ended
	Sep. 30, 2018
Joint Ventures and Variable Interest Entities
Summary of financial information of the consolidated joint ventures	September 30, September 30, 2018 2017 (in millions) Current assets $ 1,013.7 $ 832.1 Non-current assets 192.7 188.8 Total assets $ 1,206.4 $ 1,020.9 Current liabilities $ 724.2 $ 524.9 Non-current liabilities 12.7 12.4 Total liabilities 736.9 537.3 Total AECOM equity 284.2 274.7 Noncontrolling interests 185.3 208.9 Total owners’ equity 469.5 483.6 Total liabilities and owners’ equity $ 1,206.4 $ 1,020.9
Summary of financial information of the unconsolidated joint ventures, as derived from their unaudited financial statements	September 30, September 30, 2018 2017 (in millions) Current assets $ 1,903.3 $ 1,912.2 Non-current assets 938.3 749.8 Total assets $ 2,841.6 $ 2,662.0 Current liabilities $ 1,658.5 $ 1,570.2 Non-current liabilities 224.3 185.1 Total liabilities 1,882.8 1,755.3 Joint ventures’ equity 958.8 906.7 Total liabilities and joint ventures’ equity $ 2,841.6 $ 2,662.0 AECOM’s investment in joint ventures $ 310.7 $ 364.2 Twelve Months Ended September 30, September 30, 2018 2017 (in millions) Revenue $ 5,571.9 $ 5,561.8 Cost of revenue 5,325.4 5,305.5 Gross profit $ 246.5 $ 256.3 Net income $ 238.6 $ 244.8
Summary of AECOM's equity in earnings of unconsolidated joint ventures	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 (in millions) Pass through joint ventures $ 34.1 $ 36.6 $ 21.9 Other joint ventures 47.0 105.0 82.1 Total $ 81.1 $ 141.6 $ 104.0

Pension Benefit Obligations (Ta

Pension Benefit Obligations (Tables)	12 Months Ended
	Sep. 30, 2018
Pension Benefit Obligations
Reconciliations of the changes in the U.S. and international plans' benefit obligations	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Change in benefit obligation: Benefit obligation at beginning of year $ 683.0 $ 1,333.5 $ 720.0 $ 1,406.2 $ 718.2 $ 1,239.2 Service cost 4.9 1.1 4.3 1.3 4.3 1.0 Participant contributions 0.2 0.4 0.1 0.4 0.1 0.5 Interest cost 20.7 32.0 19.2 28.3 22.0 39.2 Benefits and expenses paid (37.8) (53.7) (37.9) (48.3) (37.4) (41.9) Actuarial (gain) loss (38.5) (87.7) (22.7) (98.6) 52.3 377.1 Plan settlements — (3.0) — — (32.9) (0.7) Plan amendments 0.6 — — — 0.2 — Plan curtailments — (0.1) — — (6.8) — Foreign currency translation (gain) loss — (33.7) — 44.2 — (208.2) Benefit obligation at end of year $ 633.1 $ 1,188.8 $ 683.0 $ 1,333.5 $ 720.0 $ 1,406.2
Reconciliations of the changes in the fair value of assets	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Change in plan assets Fair value of plan assets at beginning of year $ 470.4 $ 993.1 $ 456.9 $ 973.2 $ 459.0 $ 925.8 Actual return on plan assets 11.1 29.3 39.0 9.6 49.6 215.9 Employer contributions 11.6 27.8 12.3 25.8 18.5 20.2 Participant contributions 0.2 0.4 0.1 0.4 0.1 0.5 Benefits and expenses paid (37.8) (53.7) (37.9) (48.3) (37.4) (41.9) Plan settlements — (3.0) — — (32.9) (0.7) Foreign currency translation gain (loss) — (28.0) — 32.4 — (146.6) Fair value of plan assets at end of year $ 455.5 $ 965.9 $ 470.4 $ 993.1 $ 456.9 $ 973.2
Reconciliations of the funded status	Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Reconciliation of funded status: Funded status at end of year $ (177.6) $ (222.9) $ (212.6) $ (340.4) $ (263.1) $ (433.0) Contribution made after measurement date N/A N/A N/A N/A N/A N/A Net amount recognized at end of year $ (177.6) $ (222.9) $ (212.6) $ (340.4) $ (263.1) $ (433.0)
Amounts recognized in the consolidated balance sheets	Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Amounts recognized in the consolidated balance sheets: Other non-current assets $ 2.5 $ 19.1 $ 2.3 $ 13.9 $ 2.0 $ 5.3 Accrued expenses and other current liabilities (9.5) — (10.1) — (9.3) — Pension benefit obligations (170.6) (242.0) (204.8) (354.3) (255.8) (438.3) Net amount recognized in the balance sheet $ (177.6) $ (222.9) $ (212.6) $ (340.4) $ (263.1) $ (433.0)
Reconciliation of amounts in the consolidated statements of stockholders' equity	Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Reconciliation of amounts in consolidated statements of stockholders’ equity: Prior service (cost) credit $ (0.8) $ 4.1 $ (0.2) $ 4.4 $ (0.2) $ 4.4 Net loss (72.5) (186.4) (94.6) (263.7) (129.6) (343.3) Total recognized in accumulated other comprehensive loss $ (73.3) $ (182.3) $ (94.8) $ (259.3) $ (129.8) $ (338.9)
Components of net periodic cost for the Company's pension and post-retirement plans	Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Components of net periodic (benefit) cost: Service costs $ 4.9 $ 1.1 $ 4.3 $ 1.3 $ 4.3 $ 1.0 Interest cost on projected benefit obligation 20.7 32.0 19.2 28.3 22.0 39.2 Expected return on plan assets (31.5) (43.1) (31.0) (41.5) (30.8) (48.0) Amortization of prior service credits 0.1 (0.1) — (0.2) — (0.2) Amortization of net loss 4.0 8.2 4.3 13.0 4.0 5.4 Curtailment gain recognized — — — — (6.8) — Settlement (gain) loss recognized — 0.3 — — (0.9) 0.1 Net periodic (benefit) cost $ (1.8) $ (1.6) $ (3.2) $ 0.9 $ (8.2) $ (2.5)
Amounts included in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year	U.S. Int’l Amortization of prior service credit $ (0.1) $ 0.2 Amortization of net actuarial losses (3.6) (4.1) Total $ (3.7) $ (3.9)
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l (in millions) Projected benefit obligation $ 610.4 $ 1,002.6 $ 658.4 $ 1,158.3 $ 694.8 $ 1,220.3 Accumulated benefit obligation 610.4 991.9 658.4 1,145.7 694.8 1,215.7 Fair value of plan assets 451.5 760.7 466.4 804.2 453.2 782.1
Schedule of expected future benefit payments	Year Ending September 30, U.S. Int’l 2019 $ 42.9 $ 59.0 2020 42.6 54.9 2021 41.7 56.6 2022 41.7 58.4 2023 41.3 60.5 2024-2028 204.4 327.9 Total $ 414.6 $ 617.3
Schedule of underlying assumptions for the pension plans	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 U.S. Int’l U.S. Int’l U.S. Int’l Weighted-average assumptions to determine benefit obligation: Discount rate 4.15 % 2.91 % 3.64 % 2.67 % 3.41 % 2.35 % Salary increase rate N/A 2.79 % N/A 2.76 % N/A 2.61 % Weighted-average assumptions to determine net periodic benefit cost: Discount rate 3.60 % 2.67 % 3.41 % 2.35 % 4.10 % 3.80 % Salary increase rate N/A 2.76 % N/A 2.61 % N/A 2.65 % Expected long-term rate of return on plan assets 7.00 % 4.73 % 7.00 % 5.10 % 6.72 % 5.74 %
Summary of the Company's target allocation and pension plan asset allocation, both U.S. and international	Percentage of Plan Assets as of September 30, Target Allocations 2018 2017 U.S. Int’l U.S. Int’l U.S. Int’l Asset Category: Equities 40 % 25 % 40 % 38 % 43 % 27 % Debt 51 35 50 36 47 38 Cash 1 10 1 7 1 2 Property and other 8 30 9 19 9 33 Total 100 % 100 % 100 % 100 % 100 % 100 %
Fair values of the Company's post-retirement benefit plan assets by major asset categories	Fair Value Measurement as of September 30, 2018 Total Quoted Significant Carrying Prices in Other Significant Value as of Active Observable Unobservable Investments September 30, Markets Inputs Inputs measured at 2018 (Level 1) (Level 2) (Level 3) NAV (in millions) Cash and cash equivalents $ 71.7 $ 37.1 $ 34.6 $ — $ — Equity and debt securities 153.4 153.4 — — — Investment funds Diversified and equity funds 152.0 82.4 69.6 — — Fixed income funds 55.3 3.6 51.7 — — Hedge funds 15.0 — — 15.0 — Common collective funds 951.0 — — — 951.0 Assets held by insurance company 30.0 — — 30.0 — Derivative instruments (7.0) — (7.0) — — Total $ 1,421.4 $ 276.5 $ 148.9 $ 45.0 $ 951.0 Fair Value Measurement as of September 30, 2017 Total Quoted Significant Carrying Prices in Other Significant Value as of Active Observable Unobservable Investments September 30, Markets Inputs Inputs measured at 2017 (Level 1) (Level 2) (Level 3) NAV (in millions) Cash and cash equivalents $ 22.9 $ 13.1 $ 9.8 $ — $ — Equity and debt securities 7.9 6.2 1.7 — — Investment funds Diversified and equity funds 180.0 6.4 173.6 — — Fixed income funds 153.7 3.5 150.2 — — Hedge funds 14.0 — — 14.0 — Common collective funds 1,068.9 — — — 1,068.9 Assets held by insurance company 31.3 — — 31.3 — Derivative instruments (15.2) — (15.2) — — Total $ 1,463.5 $ 29.2 $ 320.1 $ 45.3 $ 1,068.9
Changes in the fair value of the Company's post-retirement plan Level 3 assets	Actual return Actual return on on plan assets, Change September 30, plan assets, relating to Transfer due to 2017 relating to assets assets sold Purchases, into / exchange September 30, Beginning still held at during the sales and (out of) rate 2018 balance reporting date period settlements Level 3 changes Ending balance (in millions) Investment funds Hedge funds $ 45.3 $ 0.4 $ — $ 0.2 $ — $ (0.9) $ 45.0 Actual return Actual return on on plan assets, Change September 30, plan assets, relating to Transfer due to 2016 relating to assets assets sold Purchases, into / exchange September 30, Beginning still held at during the sales and (out of) rate 2017 balance reporting date period settlements Level 3 changes Ending balance (in millions) Investment funds Hedge funds $ 43.3 $ (0.7) $ — $ 1.7 $ — $ 1.0 $ 45.3

Debt (Tables)

Debt (Tables)	12 Months Ended
	Sep. 30, 2018
Debt
Schedule of debt	September 30, September 30, 2018 2017 (in millions) 2014 Credit Agreement $ 1,433.8 $ 908.7 2014 Senior Notes 800.0 1,600.0 2017 Senior Notes 1,000.0 1,000.0 URS Senior Notes 247.9 247.7 Other debt 191.8 140.0 Total debt 3,673.5 3,896.4 Less: Current portion of debt and short-term borrowings (143.1) (142.0) Less: Unamortized debt issuance costs (46.7) (52.3) Long-term debt $ 3,483.7 $ 3,702.1
Schedule of maturities of debt	Fiscal Year 2019 $ 143.1 2020 92.5 2021 341.5 2022 304.9 2023 458.8 Thereafter 2,332.7 Total $ 3,673.5

Derivative Financial Instrume_2

Derivative Financial Instruments and Fair Value Measurements (Tables)	12 Months Ended
	Sep. 30, 2018
Derivative Financial Instruments and Fair Value Measurements
Notional principle, fixed rates and related expiration dates of outstanding interest rate swap agreements	September 30, 2018 Notional Amount Notional Amount Fixed Expiration Currency (in millions) Rate Date AUD 200.0 2.19 % February 2021 CAD 400.0 2.49 % September 2022 USD 200.0 2.60 % February 2023 September 30, 2017 Notional Amount Notional Amount Fixed Expiration Currency (in millions) Rate Date USD 300.0 1.63 % June 2018 USD 300.0 1.54 % September 2018

Leases (Tables)

Leases (Tables)	12 Months Ended
	Sep. 30, 2018
Leases
Schedule of amounts payable under non-cancelable operating lease commitments	The following table presents, in millions, amounts payable under non‑cancelable operating lease commitments during the following fiscal years: Year Ending September 30, 2019 $ 253.3 2020 211.5 2021 165.8 2022 136.0 2023 111.8 Thereafter 433.6 Total $ 1,312.0

Share-Based Payments (Tables)

Share-Based Payments (Tables)	12 Months Ended
	Sep. 30, 2018
Share-Based Payments
Schedule of stock option activity	Number of Weighted Options Average (in millions) Exercise Price Balance, September 30, 2015 1.3 28.26 Granted — — Exercised (0.4) 23.96 Cancelled — — Balance, September 30, 2016 0.9 30.36 Granted — — Exercised (0.2) 26.42 Cancelled — — Balance, September 30, 2017 0.7 31.11 Granted — — Exercised (0.1) 27.79 Cancelled — — Balance, September 30, 2018 0.6 31.62 Exercisable as of September 30, 2016 0.3 26.99 Exercisable as of September 30, 2017 0.1 27.79 Exercisable as of September 30, 2018 — N/A
Summary of information concerning outstanding and exercisable options	Options Outstanding Options Exercisable Number Number Outstanding Weighted Exercisable Weighted as of Average Weighted Aggregate as of Average Weighted September 30, Remaining Average Intrinsic September 30, Remaining Average 2018 Contractual Exercise Value 2018 Contractual Exercise (in millions) Life Price (in millions) (in millions) Life Price Exercise Price $31.62 0.6 5.43 $ 31.62 $ 0.7 — —

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2018
Income Taxes
Schedule of income tax (benefit) expense	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 (in millions) Current: Federal $ (122.4) $ 10.3 $ 33.7 State 19.0 17.9 12.4 Foreign 47.1 29.3 26.1 Total current income tax expense (56.3) 57.5 72.2 Deferred: Federal 14.5 (8.3) (63.4) State 39.0 10.4 (5.4) Foreign (16.8) (51.9) (41.3) Total deferred income tax expense (benefit) 36.7 (49.8) (110.1) Total income tax (benefit) expense $ (19.6) $ 7.7 $ (37.9)
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 Amount % Amount % Amount % (in millions) Tax at federal statutory rate $ 43.5 24.5 % $ 150.3 35.0 % $ 43.9 35.0 % State income tax, net of federal benefit 17.8 10.0 24.3 5.7 5.6 4.5 Valuation allowance 58.7 33.1 (51.2) (11.9) (54.8) (43.6) Impairment, nondeductible for tax 33.9 19.1 — — — — Foreign residual income 10.3 5.8 (9.2) (2.1) 17.8 14.2 Nondeductible costs 3.5 1.9 5.8 1.4 6.1 4.8 Change in tax rates 0.1 0.1 — — 34.6 27.6 Impact of changes in tax law (47.8) (26.9) — — — — Income tax credits and incentives (37.2) (21.0) (56.8) (13.2) (24.6) (19.6) Change in uncertain tax positions (31.4) (17.7) 9.5 2.2 (5.0) (4.0) Audit settlement (27.7) (15.6) — — — — Return to provision, primarily foreign tax credits (18.5) (10.4) — — — — Exclusion of tax on non-controlling interests (14.9) (8.4) (28.2) (6.6) (24.7) (19.7) Tax exempt income (7.4) (4.2) (17.9) (4.2) (17.6) (14.0) Foreign tax rate differential (1.6) (0.9) (19.2) (4.5) (19.7) (15.7) Other items, net (0.9) (0.5) 0.3 — 0.5 0.3 Total income tax expense $ (19.6) (11.1) % $ 7.7 1.8 % $ (37.9) (30.2) %
Schedule of deferred tax assets (liabilities)	Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Deferred tax assets: Compensation and benefit accruals not currently deductible $ 108.3 $ 144.2 Net operating loss carryforwards 252.4 338.2 Self-insurance reserves 13.5 23.8 Research and experimentation and other tax credits 178.1 167.5 Pension liability 88.2 142.1 Accrued liabilities 63.4 160.7 Other 27.8 25.0 Total deferred tax assets 731.7 1,001.5 Deferred tax liabilities: Unearned revenue (121.1) (190.8) Depreciation and amortization (135.9) (158.6) Acquired intangible assets (56.0) (121.7) Investment in subsidiaries (109.5) (241.2) Total deferred tax liabilities (422.5) (712.3) Valuation allowance (197.1) (138.4) Net deferred tax assets $ 112.1 $ 150.8
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits	Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Balance at the beginning of the year $ 102.1 $ 87.9 Gross increase in current period’s tax positions 4.0 10.8 Gross increase in prior years’ tax positions 2.2 5.3 Gross decrease in prior years’ tax positions (14.4) — Decrease due to settlement with tax authorities (31.9) (1.0) Decrease due to lapse of statute of limitations (1.7) (1.1) Gross change due to foreign exchange fluctuations (0.3) 0.2 Balance at the end of the year $ 60.0 $ 102.1

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Sep. 30, 2018
Earnings Per Share
Reconciliation of the denominators for basic and diluted EPS	Fiscal Year Ended September 30, September 30, September 30, 2018 2017 2016 (in millions) Denominator for basic earnings per share 159.1 155.7 154.8 Potential common shares 3.2 3.4 1.3 Denominator for diluted earnings per share 162.3 159.1 156.1

Other Financial Information (Ta

Other Financial Information (Tables)	12 Months Ended
	Sep. 30, 2018
Other Financial Information
Schedule of accrued expenses and other current liabilities	Fiscal Year Ended September 30, September 30, 2018 2017 (in millions) Accrued salaries and benefits $ 1,035.9 $ 1,018.5 Accrued contract costs 861.0 911.9 Other accrued expenses 370.1 315.1 $ 2,267.0 $ 2,245.5

Reclassifications out of Accu_2

Reclassifications out of Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Sep. 30, 2018
Reclassifications out of Accumulated Other Comprehensive Loss
Schedule of accumulated balances and reporting period activities related to reclassifications out of accumulated other comprehensive loss	Foreign Accumulated Pension Currency Loss on Other Related Translation Derivative Comprehensive Adjustments Adjustments Instruments Loss Balances at September 30, 2015 $ (204.0) $ (420.1) $ (11.0) $ (635.1) Other comprehensive income (loss) before reclassification (171.5) (63.6) 1.2 (233.9) Amounts reclassified from accumulated other comprehensive loss 6.6 — 4.8 11.4 Balances at September 30, 2016 $ (368.9) $ (483.7) $ (5.0) $ (857.6) Foreign Accumulated Pension Currency Loss on Other Related Translation Derivative Comprehensive Adjustments Adjustments Instruments Loss Balances at September 30, 2016 $ (368.9) $ (483.7) $ (5.0) $ (857.6) Other comprehensive income (loss) before reclassification 73.8 65.3 2.3 141.4 Amounts reclassified from accumulated other comprehensive loss 13.2 — 2.3 15.5 Balances at September 30, 2017 $ (281.9) $ (418.4) $ (0.4) $ (700.7) Foreign Accumulated Pension Currency Loss on Other Related Translation Derivative Comprehensive Adjustments Adjustments Instruments Loss Balances at September 30, 2017 $ (281.9) $ (418.4) $ (0.4) $ (700.7) Other comprehensive income (loss) before reclassification 69.9 (83.8) 0.7 (13.2) Amounts reclassified from accumulated other comprehensive loss 9.7 — 0.9 10.6 Balances at September 30, 2018 $ (202.3) $ (502.2) $ 1.2 $ (703.3)

Reportable Segments (Tables)

Reportable Segments (Tables)	12 Months Ended
	Sep. 30, 2018
Reportable Segments
Summarized financial information concerning the Company's reportable segments	Design and Consulting Construction Management AECOM Reportable Segments: Services Services Services Capital Corporate Total (in millions) Fiscal Year Ended September 30, 2018: Revenue $ 8,223.1 $ 8,238.9 $ 3,693.5 $ — $ — $ 20,155.5 Gross profit 439.2 40.4 171.0 — — 650.6 Equity in earnings of joint ventures 15.8 21.5 28.6 15.2 — 81.1 General and administrative expenses — — — (11.2) (124.5) (135.7) Impairment of assets held for sale, including goodwill — (168.2) — — — (168.2) Loss on disposal activities — (2.9) — — — (2.9) Operating income (loss) 455.0 (109.2) 199.6 4.0 (124.5) 424.9 Segment assets 7,013.8 4,212.0 2,701.2 140.6 613.5 14,681.1 Gross profit as a % of revenue 5.3 % 0.5 % 4.6 % 3.2 % Fiscal Year Ended September 30, 2017: Revenue $ 7,566.8 $ 7,295.6 $ 3,341.0 $ — $ — $ 18,203.4 Gross profit 394.8 92.9 196.0 — — 683.7 Equity in earnings of joint ventures 16.4 22.4 45.1 57.7 — 141.6 General and administrative expenses — — — (8.7) (124.7) (133.4) Acquisition and integration expenses — — — — (38.7) (38.7) Gain on disposal activities 0.6 — — — — 0.6 Operating income 411.8 115.3 241.1 49.0 (163.4) 653.8 Segment assets 6,992.6 4,114.5 2,704.6 199.1 386.2 14,397.0 Gross profit as a % of revenue 5.2 % 1.3 % 5.9 % 3.8 % Fiscal Year Ended September 30, 2016: Revenue $ 7,655.8 $ 6,371.1 $ 3,383.9 $ — $ — $ 17,410.8 Gross profit 382.5 25.4 234.9 — — 642.8 Equity in earnings of joint ventures 8.9 18.2 76.9 — — 104.0 General and administrative expenses — — — (6.0) (109.1) (115.1) Acquisition and integration expenses — — — — (213.6) (213.6) Loss on disposal activities — (42.6) — — — (42.6) Operating income 391.4 1.0 311.8 (6.0) (322.7) 375.5 Segment assets 6,655.7 3,556.2 2,692.7 179.1 586.2 13,669.9 Gross profit as a % of revenue 5.0 % 0.4 % 6.9 % 3.7 %
Schedule of geographic information	Fiscal Year Ended September 30, 2018 September 30, 2017 September 30, 2016 Long-Lived Long-Lived Long-Lived Revenue Assets Revenue Assets Revenue Assets (in millions) United States $ 14,753.4 4,844.1 $ 13,042.6 4,779.0 $ 12,567.0 4,763.9 Asia Pacific 1,440.6 369.2 1,352.7 382.9 1,278.3 394.0 Canada 1,212.3 513.7 1,159.9 600.4 866.5 615.7 Europe 1,984.1 1,362.3 1,869.9 1,362.8 1,904.2 1,368.4 Other foreign countries 765.1 397.2 778.3 418.3 794.8 412.5 Total $ 20,155.5 7,486.5 $ 18,203.4 7,543.4 $ 17,410.8 7,554.5

Quarterly Financial Informati_2

Quarterly Financial Information-Unaudited (Tables)	12 Months Ended
	Sep. 30, 2018
Quarterly Financial Information-Unaudited
Schedule of unaudited quarterly data	First Second Third Fourth Fiscal Year 2018: Quarter Quarter Quarter Quarter (in millions, except per share data) Revenue $ 4,910.8 $ 4,790.9 $ 5,148.0 $ 5,305.8 Cost of revenue 4,774.6 4,649.7 4,962.8 5,117.8 Gross profit 136.2 141.2 185.2 188.0 Equity in earnings of joint ventures 29.7 13.1 12.8 25.5 General and administrative expenses (34.7) (30.2) (35.1) (35.7) Impairment of assets held for sale, including goodwill — (168.2) — — Loss on disposal activities — — (2.1) (0.8) Income (loss) from operations 131.2 (44.1) 160.8 177.0 Other income 2.3 12.5 2.7 2.6 Interest expense (56.2) (100.5) (55.3) (55.5) Income (loss) before income tax (benefit) expense 77.3 (132.1) 108.2 124.1 Income tax (benefit) expense (47.1) (24.4) 33.1 18.7 Net income (loss) 124.4 (107.7) 75.1 105.4 Noncontrolling interest in income of consolidated subsidiaries, net of tax (13.1) (12.0) (14.2) (21.4) Net income (loss) attributable to AECOM $ 111.3 $ (119.7) $ 60.9 $ 84.0 Net income (loss) attributable to AECOM per share: Basic $ 0.70 $ (0.75) $ 0.38 $ 0.53 Diluted $ 0.69 $ (0.75) $ 0.37 $ 0.52 Weighted average common shares outstanding: Basic 157.9 159.5 160.4 158.6 Diluted 161.8 159.5 163.2 161.8 First Second Third Fourth Fiscal Year 2017: Quarter Quarter Quarter Quarter (in millions, except per share data) Revenue $ 4,358.3 $ 4,427.2 $ 4,561.5 $ 4,856.4 Cost of revenue 4,188.3 4,258.8 4,386.3 4,686.3 Gross profit 170.0 168.4 175.2 170.1 Equity in earnings of joint ventures 21.4 21.8 66.5 31.9 General and administrative expenses (32.6) (29.9) (34.0) (36.9) Acquisition and integration expenses (15.4) (20.0) — (3.3) Gain on disposal activities — 0.6 — — Income from operations 143.4 140.9 207.7 161.8 Other income 0.8 1.3 2.1 2.5 Interest expense (53.6) (61.8) (61.6) (54.3) Income before income tax expense (benefit) 90.6 80.4 148.2 110.0 Income tax expense (benefit) 24.8 (35.4) 12.1 6.2 Net income 65.8 115.8 136.1 103.8 Noncontrolling interest in income of consolidated subsidiaries, net of tax (18.6) (13.4) (34.8) (15.3) Net income attributable to AECOM $ 47.2 $ 102.4 $ 101.3 $ 88.5 Net income attributable to AECOM per share: Basic $ 0.31 $ 0.66 $ 0.65 $ 0.56 Diluted $ 0.30 $ 0.65 $ 0.64 $ 0.55 Weighted average common shares outstanding: Basic 154.3 155.4 155.8 157.5 Diluted 158.0 158.7 158.8 161.1

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	12 Months Ended
	Sep. 30, 2018
Condensed Consolidating Financial Information
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets (in millions) September 30, 2018 Non- Guarantor Guarantor Parent Subsidiaries Subsidiaries Eliminations Total ASSETS CURRENT ASSETS: Total cash and cash equivalents $ 22.0 $ 270.9 $ 593.8 $ — $ 886.7 Accounts receivable—net — 2,544.7 2,924.1 — 5,468.8 Intercompany receivable 951.1 84.9 157.9 (1,193.9) — Prepaid expenses and other current assets 52.9 331.6 200.7 — 585.2 Current assets held for sale — — 59.8 — 59.8 Income taxes receivable 84.6 — 42.2 — 126.8 TOTAL CURRENT ASSETS 1,110.6 3,232.1 3,978.5 (1,193.9) 7,127.3 PROPERTY AND EQUIPMENT—NET 202.6 217.3 194.2 — 614.1 DEFERRED TAX ASSETS—NET 134.0 — 150.0 (124.6) 159.4 INVESTMENTS IN CONSOLIDATED SUBSIDIARIES 6,364.1 1,912.0 — (8,276.1) — INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES 13.4 49.6 247.7 — 310.7 GOODWILL — 3,392.7 2,528.4 — 5,921.1 INTANGIBLE ASSETS—NET — 218.6 101.3 — 319.9 OTHER NON-CURRENT ASSETS 49.9 45.6 133.1 — 228.6 TOTAL ASSETS $ 7,874.6 $ 9,067.9 $ 7,333.2 $ (9,594.6) $ 14,681.1 LIABILITIES AND STOCKHOLDERS’ EQUITY CURRENT LIABILITIES: Short-term debt $ 8.4 $ — $ — $ — $ 8.4 Accounts payable 53.6 1,616.7 1,055.7 — 2,726.0 Accrued expenses and other current liabilities 58.8 1,035.6 1,172.7 — 2,267.1 Income taxes payable 10.4 — 29.4 — 39.8 Intercompany payable 105.5 830.8 416.9 (1,353.2) — Billings in excess of costs on uncompleted contracts 1.5 316.1 613.8 — 931.4 Current liabilities held for sale — — 22.3 — 22.3 Current portion of long-term debt 43.3 27.0 64.4 — 134.7 TOTAL CURRENT LIABILITIES 281.5 3,826.2 3,375.2 (1,353.2) 6,129.7 OTHER LONG-TERM LIABILITIES 131.6 249.0 361.5 — 742.1 DEFERRED TAX LIABILITY—NET — 63.1 108.9 (124.7) 47.3 NOTE PAYABLE INTERCOMPANY—NON CURRENT 800.9 — 487.5 (1,288.4) — LONG‑TERM DEBT 2,627.8 291.4 564.5 — 3,483.7 TOTAL LIABILITIES 3,841.8 4,429.7 4,897.6 (2,766.3) 10,402.8 TOTAL AECOM STOCKHOLDERS’ EQUITY 4,032.8 4,638.2 2,250.1 (6,828.3) 4,092.8 Noncontrolling interests — — 185.5 — 185.5 TOTAL STOCKHOLDERS’ EQUITY 4,032.8 4,638.2 2,435.6 (6,828.3) 4,278.3 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 7,874.6 $ 9,067.9 $ 7,333.2 $ (9,594.6) $ 14,681.1 Condensed Consolidating Balance Sheets (in millions) September 30, 2017 Non- Guarantor Guarantor Parent Subsidiaries Subsidiaries Eliminations Total ASSETS CURRENT ASSETS: Total cash and cash equivalents $ 32.6 $ 254.9 $ 514.9 $ — $ 802.4 Accounts receivable—net — 2,426.4 2,701.3 — 5,127.7 Intercompany receivable 723.6 89.0 183.4 (996.0) — Prepaid expenses and other current assets 67.5 366.5 262.7 — 696.7 Income taxes receivable 4.3 — 51.1 — 55.4 TOTAL CURRENT ASSETS 828.0 3,136.8 3,713.4 (996.0) 6,682.2 PROPERTY AND EQUIPMENT—NET 160.2 215.0 246.2 — 621.4 DEFERRED TAX ASSETS—NET 239.7 61.7 164.5 (294.6) 171.3 INVESTMENTS IN CONSOLIDATED SUBSIDIARIES 6,606.2 2,812.8 — (9,419.0) — INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES 7.2 69.7 287.3 — 364.2 GOODWILL — 3,392.7 2,600.2 — 5,992.9 INTANGIBLE ASSETS—NET — 271.6 143.5 — 415.1 OTHER NON-CURRENT ASSETS 8.7 47.4 93.8 — 149.9 TOTAL ASSETS $ 7,850.0 $ 10,007.7 $ 7,248.9 $ (10,709.6) $ 14,397.0 LIABILITIES AND STOCKHOLDERS’ EQUITY CURRENT LIABILITIES: Short-term debt $ 1.1 $ — $ 0.1 $ — $ 1.2 Accounts payable 33.8 1,301.7 914.4 — 2,249.9 Accrued expenses and other current liabilities 92.2 1,171.8 981.5 — 2,245.5 Income taxes payable — 8.1 30.1 — 38.2 Intercompany payable 149.2 789.5 159.6 (1,098.3) — Billings in excess of costs on uncompleted contracts 3.4 341.7 557.7 — 902.8 Current portion of long-term debt 110.9 14.9 15.0 — 140.8 TOTAL CURRENT LIABILITIES 390.6 3,627.7 2,658.4 (1,098.3) 5,578.4 OTHER LONG-TERM LIABILITIES 102.3 290.7 488.3 — 881.3 DEFERRED TAX LIABILITY—NET — 0.6 314.5 (294.6) 20.5 NOTE PAYABLE INTERCOMPANY—NON CURRENT 0.1 — 467.2 (467.3) — LONG-TERM DEBT 3,366.9 281.6 53.6 — 3,702.1 TOTAL LIABILITIES 3,859.9 4,200.6 3,982.0 (1,860.2) 10,182.3 TOTAL AECOM STOCKHOLDERS’ EQUITY 3,990.1 5,807.1 3,048.3 (8,849.4) 3,996.1 Noncontrolling interests — — 218.6 — 218.6 TOTAL STOCKHOLDERS’ EQUITY 3,990.1 5,807.1 3,266.9 (8,849.4) 4,214.7 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 7,850.0 $ 10,007.7 $ 7,248.9 $ (10,709.6) $ 14,397.0
Schedule of Condensed Consolidating Statements of Operations	Condensed Consolidating Statements of Operations (in millions) For the Fiscal Year Ended September 30, 2018 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Revenue $ — $ 11,052.9 $ 9,212.9 $ (110.3) $ 20,155.5 Cost of revenue — 10,757.2 8,858.0 (110.3) 19,504.9 Gross profit — 295.7 354.9 — 650.6 Equity in earnings from subsidiaries 460.9 207.2 — (668.1) — Equity in earnings of joint ventures — 37.2 43.9 — 81.1 General and administrative expenses (124.4) — (11.3) — (135.7) Impairment on assets held for sale, including goodwill — — (168.2) — (168.2) Loss on disposal activities — — (2.9) — (2.9) Income from operations 336.5 540.1 216.4 (668.1) 424.9 Other income 12.0 34.5 12.7 (39.1) 20.1 Interest expense (242.9) (25.1) (38.6) 39.1 (267.5) Income before income tax (benefit) expense 105.6 549.5 190.5 (668.1) 177.5 Income tax (benefit) expense (31.1) 98.8 (87.4) — (19.7) Net income 136.7 450.7 277.9 (668.1) 197.2 Noncontrolling interests in income of consolidated subsidiaries, net of tax — — (60.7) — (60.7) Net income attributable to AECOM $ 136.7 $ 450.7 $ 217.2 $ (668.1) $ 136.5 For the Fiscal Year Ended September 30, 2017 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Revenue $ — $ 10,491.6 $ 7,764.1 $ (52.3) $ 18,203.4 Cost of revenue — 10,136.1 7,435.9 (52.3) 17,519.7 Gross profit — 355.5 328.2 — 683.7 Equity in earnings from subsidiaries 439.3 222.4 — (661.7) — Equity in earnings of joint ventures — 43.8 97.8 — 141.6 General and administrative expenses (124.7) — (8.7) — (133.4) Acquisition and integration expenses (38.7) — — — (38.7) Gain on disposal activities — — 0.6 — 0.6 Income from operations 275.9 621.7 417.9 (661.7) 653.8 Other income 2.1 31.9 9.2 (36.5) 6.7 Interest expense (203.7) (31.1) (33.0) 36.5 (231.3) Income before income tax (benefit) expense 74.3 622.5 394.1 (661.7) 429.2 Income tax (benefit) expense (264.9) 182.5 58.4 31.7 7.7 Net income 339.2 440.0 335.7 (693.4) 421.5 Noncontrolling interests in income of consolidated subsidiaries, net of tax — — (82.1) — (82.1) Net income attributable to AECOM $ 339.2 $ 440.0 $ 253.6 $ (693.4) $ 339.4 Condensed Consolidating Statements of Operations (in millions) For the Fiscal Year Ended September 30, 2016 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Revenue $ — $ 10,182.1 $ 7,310.7 $ (82.0) $ 17,410.8 Cost of revenue — 9,864.3 6,985.7 (82.0) 16,768.0 Gross profit — 317.8 325.0 — 642.8 Equity in earnings from subsidiaries 437.4 242.7 — (680.1) — Equity in earnings of joint ventures — 38.4 65.6 — 104.0 General and administrative expenses (114.0) (1.1) — — (115.1) Acquisition and integration expenses (213.6) — — — (213.6) Loss on disposal activities — — (42.6) — (42.6) Income from operations 109.8 597.8 348.0 (680.1) 375.5 Other income 0.8 34.7 12.7 (40.0) 8.2 Interest expense (231.7) (29.0) (37.4) 40.0 (258.1) (Loss) income before income tax (benefit) expense (121.1) 603.5 323.3 (680.1) 125.6 Income tax (benefit) expense (217.3) 118.7 23.4 37.3 (37.9) Net income 96.2 484.8 299.9 (717.4) 163.5 Noncontrolling interests in income of consolidated subsidiaries, net of tax — — (67.4) — (67.4) Net income attributable to AECOM $ 96.2 $ 484.8 $ 232.5 $ (717.4) $ 96.1
Schedule of Consolidating Statements of Comprehensive Income (Loss)	Consolidating Statements of Comprehensive Income (Loss) (in millions) For the Fiscal Year Ended September 30, 2018 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Net income $ 136.7 $ 450.7 $ 277.9 $ (668.1) $ 197.2 Other comprehensive income (loss), net of tax: Net unrealized gain (loss) on derivatives, net of tax 2.3 — (0.6) — 1.7 Foreign currency translation adjustments — — (82.7) — (82.7) Pension adjustments, net of tax 5.0 10.8 63.7 — 79.5 Other comprehensive income (loss), net of tax 7.3 10.8 (19.6) — (1.5) Comprehensive income, net of tax 144.0 461.5 258.3 (668.1) 195.7 Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax — — (61.9) — (61.9) Comprehensive income attributable to AECOM, net of tax $ 144.0 $ 461.5 $ 196.4 $ (668.1) $ 133.8 For the Fiscal Year Ended September 30, 2017 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Net income $ 339.2 $ 440.0 $ 335.7 $ (693.4) $ 421.5 Other comprehensive income (loss), net of tax: Net unrealized gain (loss) on derivatives, net of tax 4.9 — (0.3) — 4.6 Foreign currency translation adjustments — — 65.4 — 65.4 Pension adjustments, net of tax 7.1 13.8 66.1 — 87.0 Other comprehensive income, net of tax 12.0 13.8 131.2 — 157.0 Comprehensive income, net of tax 351.2 453.8 466.9 (693.4) 578.5 Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax — — (82.2) — (82.2) Comprehensive income attributable to AECOM, net of tax $ 351.2 $ 453.8 $ 384.7 $ (693.4) $ 496.3 For the Fiscal Year Ended September 30, 2016 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total Net income $ 96.2 $ 484.8 $ 299.9 $ (717.4) $ 163.5 Other comprehensive income (loss), net of tax: Net unrealized gain on derivatives, net of tax 2.6 — 3.4 — 6.0 Foreign currency translation adjustments — — (65.3) — (65.3) Pension adjustments, net of tax (3.3) (14.9) (146.7) — (164.9) Other comprehensive loss, net of tax (0.7) (14.9) (208.6) — (224.2) Comprehensive income (loss), net of tax 95.5 469.9 91.3 (717.4) (60.7) Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax — — (65.7) — (65.7) Comprehensive income (loss) attributable to AECOM, net of tax $ 95.5 $ 469.9 $ 25.6 $ (717.4) $ (126.4)
Schedule on Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows (in millions) For the Fiscal Year Ended September 30, 2018 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES $ (205.5) $ 640.9 $ 339.1 $ — $ 774.5 CASH FLOWS FROM INVESTING ACTIVITIES: Proceeds from purchase price adjustment to business acquisition — — 2.2 — 2.2 Cash acquired from consolidation of joint venture — — 7.6 — 7.6 Proceeds from disposal of business, net of cash disposed — — 19.5 — 19.5 Net investment in unconsolidated joint ventures (6.1) (9.1) 30.0 — 14.8 Net purchases of investments — — (16.3) — (16.3) Payments for capital expenditures, net of disposals (29.3) (39.1) (18.5) — (86.9) Net investment in intercompany notes (54.3) (778.8) (5.6) 838.7 — Other intercompany investing activities 528.2 1,022.1 — (1,550.3) — Net cash provided by investing activities 438.5 195.1 18.9 (711.6) (59.1) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from borrowings under credit agreements 7,770.4 0.2 758.4 — 8,529.0 Repayments of borrowings under credit agreements (7,820.0) (18.0) (202.2) — (8,040.2) Redemption of unsecured senior notes (800.0) — — — (800.0) Prepayment penalty on unsecured senior notes (34.5) — — — (34.5) Cash paid for debt issuance costs (12.2) — — — (12.2) Proceeds from issuance of common stock 35.2 — — — 35.2 Proceeds from exercise of stock options 2.8 — — — 2.8 Payments to repurchase common stock under the share repurchase Program (150.0) — — — (150.0) Payments to repurchase common stock (29.5) — — — (29.5) Net distributions to noncontrolling interests — — (89.8) — (89.8) Other financing activities (3.6) (22.4) (9.7) — (35.7) Net borrowings on intercompany notes 797.8 5.9 35.0 (838.7) — Other intercompany financing activities — (785.7) (764.6) 1,550.3 — Net cash used in financing activities (243.6) (820.0) (272.9) 711.6 (624.9) EFFECT OF EXCHANGE RATE CHANGES ON CASH — — (6.2) — (6.2) NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (10.6) 16.0 78.9 — 84.3 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 32.6 254.9 514.9 — 802.4 CASH AND CASH EQUIVALENTS AT END OF YEAR $ 22.0 $ 270.9 $ 593.8 $ — $ 886.7 For the Fiscal Year Ended September 30, 2017 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES $ (5.9) $ 695.0 $ 7.6 $ — $ 696.7 CASH FLOWS FROM INVESTING ACTIVITIES: Payments for business acquisitions, net of cash acquired — — (103.1) — (103.1) Proceeds from disposal of business, net of cash disposed — — 2.2 — 2.2 Net investment in unconsolidated joint ventures — (2.7) (21.6) — (24.3) Net purchases of investments — — 0.9 — 0.9 Payments for capital expenditures, net of disposals (21.7) (30.6) (26.1) — (78.4) Net (investment in) reciepts from intercompany notes (4.6) 102.8 12.2 (110.4) — Other intercompany investing activities 139.0 (233.2) — 94.2 — Net cash provided by (used in) investing activities 112.7 (163.7) (135.5) (16.2) (202.7) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from borrowings under credit agreements 5,903.5 13.1 36.6 — 5,953.2 Repayments of borrowings under credit agreements (6,956.3) (51.1) (64.2) — (7,071.6) Issuance of unsecured senior notes 1,000.0 — — — 1,000.0 Redemption of unsecured senior notes — (179.2) — — (179.2) Cash paid for debt and equity issuance costs (13.0) — — — (13.0) Proceeds from issuance of common stock 30.1 — — — 30.1 Proceeds from exercise of stock options 4.9 — — — 4.9 Payments to repurchase common stock (25.1) — — — (25.1) Net distributions to noncontrolling interests — — (59.0) — (59.0) Other financing activities (24.1) (38.3) 35.6 — (26.8) Net borrowings (repayments) on intercompany notes 4.0 (16.3) (98.1) 110.4 — Other intercompany financing activities — (200.9) 295.1 (94.2) — Net cash provided by (used in) financing activities (76.0) (472.7) 146.0 16.2 (386.5) EFFECT OF EXCHANGE RATE CHANGES ON CASH — — 2.8 — 2.8 NET INCREASE IN CASH AND CASH EQUIVALENTS 30.8 58.6 20.9 — 110.3 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 1.8 196.3 494.0 — 692.1 CASH AND CASH EQUIVALENTS AT END OF YEAR $ 32.6 $ 254.9 $ 514.9 $ — $ 802.4 Condensed Consolidating Statements of Cash Flows (in millions) For the Fiscal Year Ended September 30, 2016 Guarantor Non-Guarantor Parent Subsidiaries Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES $ (273.6) $ 639.0 $ 448.8 $ — $ 814.2 CASH FLOWS FROM INVESTING ACTIVITIES: Payments for business acquisitions, net of cash acquired — (1.0) (4.5) — (5.5) Proceeds from disposal of businesses and property — — 39.7 — 39.7 Net investment in unconsolidated joint ventures — (3.1) (68.4) — (71.5) Net purchases of investments — — 11.5 — 11.5 Payments for capital expenditures, net of disposals (82.0) (59.5) 4.7 — (136.8) Net receipts from (investment in) intercompany notes 5.3 176.1 (13.5) (167.9) — Other intercompany investing activities 791.2 140.3 — (931.5) — Net cash provided by (used in) investing activities 714.5 252.8 (30.5) (1,099.4) (162.6) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from borrowings under credit agreements 4,673.0 17.6 15.6 — 4,706.2 Repayments of borrowings under credit agreements (5,124.1) (22.8) (53.1) — (5,200.0) Cash paid for debt and equity issuance costs (10.4) — — — (10.4) Proceeds from issuance of common stock 28.2 — — — 28.2 Proceeds from exercise of stock options 9.9 — — — 9.9 Payments to repurchase common stock (25.9) — — — (25.9) Net distributions to noncontrolling interests — — (103.2) — (103.2) Other financing activities 7.9 (4.5) (46.3) — (42.9) Net borrowings (repayments) on intercompany notes 1.0 12.5 (181.4) 167.9 — Other intercompany financing activities — (867.6) (63.9) 931.5 — Net cash used in financing activities (440.4) (864.8) (432.3) 1,099.4 (638.1) EFFECT OF EXCHANGE RATE CHANGES ON CASH — — (5.3) — (5.3) NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0.5 27.0 (19.3) — 8.2 CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 1.3 169.3 513.3 — 683.9 CASH AND CASH EQUIVALENTS AT END OF YEAR $ 1.8 $ 196.3 $ 494.0 $ — $ 692.1

Significant Accounting Polici_4

Significant Accounting Policies - Fiscal Year (Details)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Significant Accounting Policies
Length of fiscal year	364 days	364 days	364 days

Significant Accounting Polici_5

Significant Accounting Policies - Revenue (Details) $ in Billions	12 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Revenue Recognition
Subcontractor and other direct costs | $	$ 10.7	$ 9.2	$ 8.4
Cost Reimbursable Contract
Revenue Recognition
Types of contracts (number)	2
Cost Reimbursable Contract | Revenue
Revenue Recognition
Concentration (as a percent)	47.00%	48.00%	53.00%
Cost Plus Contract
Revenue Recognition
Types of contracts (number)	2
Guaranteed Maximum Price Contract | Revenue
Revenue Recognition
Concentration (as a percent)	23.00%	23.00%	15.00%
Fixed-price Contract
Revenue Recognition
Types of contracts (number)	2
Fixed-price Contract | Revenue
Revenue Recognition
Concentration (as a percent)	30.00%	29.00%	32.00%

Significant Accounting Polici_6

Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Sep. 30, 2018
Minimum | Building and land
Property, Plant and Equipment
Estimated useful live (in years)	10 years
Minimum | Furniture and Fixtures
Property, Plant and Equipment
Estimated useful live (in years)	3 years
Minimum | Computer systems and equipment
Property, Plant and Equipment
Estimated useful live (in years)	3 years
Maximum | Building and land
Property, Plant and Equipment
Estimated useful live (in years)	45 years
Maximum | Furniture and Fixtures
Property, Plant and Equipment
Estimated useful live (in years)	10 years
Maximum | Computer systems and equipment
Property, Plant and Equipment
Estimated useful live (in years)	12 years

Significant Accounting Polici_7

Significant Accounting Policies - Pension Plans (Details)	12 Months Ended
	Sep. 30, 2018
Significant Accounting Policies
Market-related valuation calculation period (in years)	5 years
Net unrecognized gain (loss) threshold subject to amortization (in percent)	10.00%

Business Acquisitions, Goodwi_3

Business Acquisitions, Goodwill and Intangible Assets - URS Acquisition (Details) $ in Millions	Oct. 17, 2014USD ($)	Sep. 30, 2018USD ($)item	Sep. 30, 2017USD ($)item	Sep. 30, 2016USD ($)
Business acquisition
Number of acquisitions | item		1	2
Total consideration		$ 5.6	$ 164.4
Amortization of Intangible Assets		96.7	102.7	$ 202.4
URS
Business acquisition
Estimated Legal settlements and uninsured legal damages	$ 240
Amortization of Intangible Assets		7.1	9.4
Margin fair value liability		20.6	8.6
Income from operations related to margin fair value liability		21.1	6.3
URS | Customer relationships, contracts and backlog
Business acquisition
Acquired backlog and customer relationship assets	$ 973.8
URS | Customer relationships, contracts and backlog | Minimum
Business acquisition
Useful life (in years)	1 year
URS | Customer relationships, contracts and backlog | Maximum
Business acquisition
Useful life (in years)	11 years
URS | Customer relationships, contracts and backlog | Weighted Average
Business acquisition
Useful life (in years)	3 years
URS | Cost of revenue
Business acquisition
Amortization of Intangible Assets		68.4	83.6
URS | Non-Controlling Interests
Business acquisition
Amortization of Intangible Assets		$ (8.5)	$ (8.5)

Business Acquisitions, Goodwi_4

Business Acquisitions, Goodwill and Intangible Assets - Expenses (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Business acquisition
Severance and personnel costs				$ 32,000
Professional services, real estate-related, and other expenses				6,700
Total	$ 3,300	$ 20,000	$ 15,400	38,709	$ 213,642
Severance and personnel costs
Business acquisition
Severance expense				$ 9,800

Business Acquisitions, Goodwi_5

Business Acquisitions, Goodwill and Intangible Assets - Disposal Group (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet
Loss on disposal of portion of assets in the disposal group	$ 800	$ 2,100		$ (600)	$ 2,949	$ (572)	$ 42,589
Impairment of assets held for sale, including goodwill			$ 168,200		168,178
Impairment of goodwill					125,400
Disposal activities
Net assets related to the loss on disposal activities	59,800				59,800
Construction Services
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet
Loss on disposal of portion of assets in the disposal group					2,900		$ 42,600
Impairment of assets held for sale, including goodwill					168,200
Impairment of goodwill					125,400
Construction Services | Disposal Group as held for sale
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet
Loss on disposal of portion of assets in the disposal group		$ 2,100
Impairment of intangible and other noncurrent assets					42,800
Accounts receivable included in Current assets held for sale	44,500				44,500
Property plant and equipment included in Current assets held for sale	14,900				14,900
Accounts payable included in Current liabilities held for sale	$ 22,300				$ 22,300
URS
Disposal activities
Net assets related to the loss on disposal activities						$ 112,800

Business Acquisitions, Goodwi_6

Business Acquisitions, Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	$ 5,992,881	$ 5,823,800
Measurement period adjustments	91,000
Impairment	(125,400)
Acquisitions		127,100
Disposed		(1,800)
Foreign Exchange Impact	(37,400)	43,800
Goodwill at the end of the period	5,921,116	5,992,881
Design and Consulting Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	3,218,900	3,198,200
Acquisitions		3,800
Disposed		(1,800)
Foreign Exchange Impact	(29,700)	18,700
Goodwill at the end of the period	3,189,200	3,218,900
Construction Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	1,049,900	915,200
Measurement period adjustments	91,000
Impairment	(125,400)
Acquisitions		123,300
Foreign Exchange Impact	(6,600)	11,400
Goodwill at the end of the period	1,008,900	1,049,900
Management Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	1,724,100	1,710,400
Foreign Exchange Impact	(1,100)	13,700
Goodwill at the end of the period	$ 1,723,000	$ 1,724,100

Business Acquisitions, Goodwi_7

Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Identifiable intangible assets with finite useful lives
Gross Amount	$ 1,303,400	$ 1,301,900
Accumulated Amortization	(983,500)	(886,800)
Intangible Assets, Net	319,892	415,096
Backlog and customer relationships
Identifiable intangible assets with finite useful lives
Gross Amount	1,285,100	1,283,600
Accumulated Amortization	(966,000)	(870,200)
Intangible Assets, Net	$ 319,100	413,400
Backlog and customer relationships | Minimum
Identifiable intangible assets with finite useful lives
Amortization Period	1 year
Backlog and customer relationships | Maximum
Identifiable intangible assets with finite useful lives
Amortization Period	11 years
Trademark / tradename
Identifiable intangible assets with finite useful lives
Gross Amount	$ 18,300	18,300
Accumulated Amortization	(17,500)	(16,600)
Intangible Assets, Net	$ 800	$ 1,700
Trademark / tradename | Minimum
Identifiable intangible assets with finite useful lives
Amortization Period	3 months 18 days
Trademark / tradename | Maximum
Identifiable intangible assets with finite useful lives
Amortization Period	2 years

Business Acquisitions, Goodwi_8

Business Acquisitions, Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Business Acquisitions, Goodwill and Intangible Assets
Amortization expense	$ 96,700	$ 102,700	$ 202,400
Estimated amortization expense for the succeeding years
2,019	83,700
2,020	69,800
2,021	56,800
2,022	44,000
2,023	39,500
Thereafter	26,100
Intangible Assets, Net	$ 319,892	$ 415,096

Accounts Receivable - Net (Deta

Accounts Receivable - Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Billed	$ 2,697,700	$ 2,317,800
Unbilled	2,161,000	2,293,500
Contract retentions	661,700	568,600
Total accounts receivable-gross	5,520,400	5,179,900
Allowance for doubtful accounts	(51,600)	(52,200)
Total accounts receivable-net	$ 5,468,821	$ 5,127,743
Additional disclosures
Unbilled receivables are expected to be billed and collected (in months)	12 months	12 months
Significant claims recorded in unbilled receivables and other non-current assets	$ 266,000	$ 227,700
Trade receivables sold, outstanding	$ 334,200	$ 325,200
Other than U.S government outstanding receivables
Additional disclosures
Number of Customers	0	0
Outstanding receivables (as a percent)	10.00%	10.00%

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Property and equipment
Property and equipment, gross	$ 1,348,100	$ 1,298,700
Accumulated depreciation and amortization	(734,000)	(677,300)
Property and equipment, net	614,062	621,357
Depreciation expense	158,500	157,100	$ 171,700
Building and land
Property and equipment
Property and equipment, gross	75,200	63,600
Leasehold improvements
Property and equipment
Property and equipment, gross	399,200	404,600
Computer systems and equipment
Property and equipment
Property and equipment, gross	741,200	694,600
Furniture and Fixtures
Property and equipment
Property and equipment, gross	$ 132,500	$ 135,900

Property and Equipment - Useful

Property and Equipment - Useful Lives (Details)	12 Months Ended
	Sep. 30, 2018
Building and land | Minimum
Property and equipment
Useful Lives	10 years
Building and land | Maximum
Property and equipment
Useful Lives	45 years
Leasehold improvements | Minimum
Property and equipment
Useful Lives	1 year
Leasehold improvements | Maximum
Property and equipment
Useful Lives	20 years
Computer systems and equipment | Minimum
Property and equipment
Useful Lives	3 years
Computer systems and equipment | Maximum
Property and equipment
Useful Lives	12 years
Furniture and Fixtures | Minimum
Property and equipment
Useful Lives	3 years
Furniture and Fixtures | Maximum
Property and equipment
Useful Lives	10 years

Joint Ventures and Variable I_3

Joint Ventures and Variable Interest Entities - Consolidated (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018USD ($)itememployee	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2018USD ($)itememployee	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Financial Information
Minimum number of partners required | item	2								2
Minimum number of employees | employee	0								0
Current assets	$ 7,127,322				$ 6,682,222				$ 7,127,322	$ 6,682,222
TOTAL ASSETS	14,681,131				14,396,956				14,681,131	14,396,956	$ 13,669,900
Current liabilities	6,129,677				5,578,379				6,129,677	5,578,379
TOTAL LIABILITIES	10,402,757				10,182,270				10,402,757	10,182,270
Total AECOM equity	4,092,780				3,996,126				4,092,780	3,996,126
Noncontrolling interests	185,594				218,560				185,594	218,560
TOTAL STOCKHOLDERS' EQUITY	4,278,374				4,214,686				4,278,374	4,214,686	3,552,489	$ 3,630,943
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	14,681,131				14,396,956				14,681,131	14,396,956
Joint ventures summarized financial information
Revenue	5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	4,856,400	$ 4,561,500	$ 4,427,200	$ 4,358,300	20,155,512	18,203,402	17,410,825
Consolidated Joint Ventures
Financial Information
Current assets	1,013,700				832,100				1,013,700	832,100
Non-current assets	192,700				188,800				192,700	188,800
TOTAL ASSETS	1,206,400				1,020,900				1,206,400	1,020,900
Current liabilities	724,200				524,900				724,200	524,900
Non-current liabilities	12,700				12,400				12,700	12,400
TOTAL LIABILITIES	736,900				537,300				736,900	537,300
Total AECOM equity	284,200				274,700				284,200	274,700
Noncontrolling interests	185,300				208,900				185,300	208,900
TOTAL STOCKHOLDERS' EQUITY	469,500				483,600				469,500	483,600
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,206,400				$ 1,020,900				1,206,400	1,020,900
Joint ventures summarized financial information
Revenue									$ 2,525,000	$ 1,933,500	$ 1,935,200

Joint Ventures and Variable I_4

Joint Ventures and Variable Interest Entities - Unconsolidated (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financial Information
Current assets	$ 7,127,322				$ 6,682,222				$ 7,127,322	$ 6,682,222
TOTAL ASSETS	14,681,131				14,396,956				14,681,131	14,396,956	$ 13,669,900
Current liabilities	6,129,677				5,578,379				6,129,677	5,578,379
TOTAL LIABILITIES	10,402,757				10,182,270				10,402,757	10,182,270
TOTAL STOCKHOLDERS' EQUITY	4,278,374				4,214,686				4,278,374	4,214,686	3,552,489	$ 3,630,943
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	14,681,131				14,396,956				14,681,131	14,396,956
AECOM's investment in joint ventures	310,661				364,223				310,661	364,223
Joint ventures summarized financial information
Revenue	5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	4,856,400	$ 4,561,500	$ 4,427,200	$ 4,358,300	20,155,512	18,203,402	17,410,825
Cost of revenue	5,117,800	4,962,800	4,649,700	4,774,600	4,686,300	4,386,300	4,258,800	4,188,300	19,504,863	17,519,682	16,768,001
Gross profit	188,000	185,200	141,200	136,200	170,100	175,200	168,400	170,000	650,649	683,720	642,824
Net income	105,400	$ 75,100	$ (107,700)	$ 124,400	103,800	$ 136,100	$ 115,800	$ 65,800	197,127	421,476	$ 163,472
Unconsolidated Joint Ventures
Financial Information
Current assets	1,903,300				1,912,200				1,903,300	1,912,200
Non-current assets	938,300				749,800				938,300	749,800
TOTAL ASSETS	2,841,600				2,662,000				2,841,600	2,662,000
Current liabilities	1,658,500				1,570,200				1,658,500	1,570,200
Non-current liabilities	224,300				185,100				224,300	185,100
TOTAL LIABILITIES	1,882,800				1,755,300				1,882,800	1,755,300
TOTAL STOCKHOLDERS' EQUITY	958,800				906,700				958,800	906,700
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,841,600				2,662,000				2,841,600	2,662,000
AECOM's investment in joint ventures	$ 310,700				$ 364,200				310,700	364,200
Joint ventures summarized financial information
Revenue									5,571,900	5,561,800
Cost of revenue									5,325,400	5,305,500
Gross profit									246,500	256,300
Net income									$ 238,600	$ 244,800

Joint Ventures and Variable I_5

Joint Ventures and Variable Interest Entities - Equity in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financial Information
Equity in earnings of joint ventures	$ 25,500	$ 12,800	$ 13,100	$ 29,700	$ 31,900	$ 66,500	$ 21,800	$ 21,400	$ 81,133	$ 141,582	$ 104,032
Unconsolidated Joint Ventures | Pass through joint ventures
Financial Information
Equity in earnings of joint ventures									34,100	36,600	21,900
Unconsolidated Joint Ventures | Other joint ventures
Financial Information
Equity in earnings of joint ventures									$ 47,000	105,000	$ 82,100
Provost Square I LLC
Additional information unconsolidated joint ventures
Gain from sale of interest in joint venture										$ 52,000
Equity interest (in percent)					50.00%					50.00%

Pension Benefit Obligations (De

Pension Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
United States
Change in benefit obligation:
Benefit obligation at beginning of year	$ 683	$ 720	$ 718.2
Service costs	4.9	4.3	4.3
Participant contributions	0.2	0.1	0.1
Interest cost	20.7	19.2	22
Benefits and expenses paid	(37.8)	(37.9)	(37.4)
Actuarial (gain) loss	(38.5)	(22.7)	52.3
Plan settlements			(32.9)
Plan amendments	0.6		0.2
Plan curtailments			(6.8)
Benefit obligation at end of year	633.1	683	720
Foreign Pension Plan, Defined Benefit
Change in benefit obligation:
Benefit obligation at beginning of year	1,333.5	1,406.2	1,239.2
Service costs	1.1	1.3	1
Participant contributions	0.4	0.4	0.5
Interest cost	32	28.3	39.2
Benefits and expenses paid	(53.7)	(48.3)	(41.9)
Actuarial (gain) loss	(87.7)	(98.6)	377.1
Plan settlements	(3)		(0.7)
Plan curtailments	(0.1)
Foreign currency translation (gain) loss	(33.7)	44.2	(208.2)
Benefit obligation at end of year	$ 1,188.8	$ 1,333.5	$ 1,406.2

Pension Benefit Obligations - A

Pension Benefit Obligations - Asset Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Change in plan assets
Fair value of plan assets at beginning of year	$ 1,463.5
Fair value of plan assets at end of year	1,421.4	$ 1,463.5
United States
Change in plan assets
Fair value of plan assets at beginning of year	470.4	456.9	$ 459
Actual return on plan assets	11.1	39	49.6
Employer contributions	11.6	12.3	18.5
Participant contributions	0.2	0.1	0.1
Benefits and expenses paid	(37.8)	(37.9)	(37.4)
Plan settlements			(32.9)
Fair value of plan assets at end of year	455.5	470.4	456.9
Foreign Pension Plan, Defined Benefit
Change in plan assets
Fair value of plan assets at beginning of year	993.1	973.2	925.8
Actual return on plan assets	29.3	9.6	215.9
Employer contributions	27.8	25.8	20.2
Participant contributions	0.4	0.4	0.5
Benefits and expenses paid	(53.7)	(48.3)	(41.9)
Plan settlements	(3)		(0.7)
Foreign currency translation gain (loss)	(28)	32.4	(146.6)
Fair value of plan assets at end of year	$ 965.9	$ 993.1	$ 973.2

Pension Benefit Obligations - F

Pension Benefit Obligations - Funded Status (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
United States
Reconciliation of funded status:
Funded status at end of year	$ (177.6)	$ (212.6)	$ (263.1)
Net amount recognized at end of year	(177.6)	(212.6)	(263.1)
Foreign Pension Plan, Defined Benefit
Reconciliation of funded status:
Funded status at end of year	(222.9)	(340.4)	(433)
Net amount recognized at end of year	$ (222.9)	$ (340.4)	$ (433)

Pension Benefit Obligations - B

Pension Benefit Obligations - Balance Sheet Recognition (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Amounts recognized in the consolidated balance sheets:
Pension benefit obligations	$ (412,604)	$ (559,068)
United States
Amounts recognized in the consolidated balance sheets:
Other non-current assets	2,500	2,300	$ 2,000
Accrued expenses and other current liabilities	(9,500)	(10,100)	(9,300)
Pension benefit obligations	(170,600)	(204,800)	(255,800)
Net amount recognized in the balance sheet	(177,600)	(212,600)	(263,100)
Foreign Pension Plan, Defined Benefit
Amounts recognized in the consolidated balance sheets:
Other non-current assets	19,100	13,900	5,300
Pension benefit obligations	(242,000)	(354,300)	(438,300)
Net amount recognized in the balance sheet	$ (222,900)	$ (340,400)	$ (433,000)

Pension Benefit Obligations - E

Pension Benefit Obligations - Equity Recognition (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
United States
Reconciliation of amounts in consolidated statements of stockholders' equity:
Prior service (cost) credit	$ (0.8)	$ (0.2)	$ (0.2)
Net loss	(72.5)	(94.6)	(129.6)
Total recognized in accumulated other comprehensive loss	(73.3)	(94.8)	(129.8)
Foreign Pension Plan, Defined Benefit
Reconciliation of amounts in consolidated statements of stockholders' equity:
Prior service (cost) credit	4.1	4.4	4.4
Net loss	(186.4)	(263.7)	(343.3)
Total recognized in accumulated other comprehensive loss	$ (182.3)	$ (259.3)	$ (338.9)

Pension Benefit Obligations - P

Pension Benefit Obligations - Periodic Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Pension Plan, Defined Benefit
Components of net periodic (benefit) cost:
Applicable deferred income taxes, included in OCI arising from net prior service cost and net gain/loss	$ 19.1	$ 27.6	$ 26.2
United States
Components of net periodic (benefit) cost:
Service costs	4.9	4.3	4.3
Interest cost on projected benefit obligation	20.7	19.2	22
Expected return on plan assets	(31.5)	(31)	(30.8)
Amortization of prior service credits	0.1
Amortization of net loss	4	4.3	4
Curtailment gain recognized			(6.8)
Settlement (gain) loss recognized			(0.9)
Net periodic (benefit) cost	(1.8)	(3.2)	(8.2)
Foreign Pension Plan, Defined Benefit
Components of net periodic (benefit) cost:
Service costs	1.1	1.3	1
Interest cost on projected benefit obligation	32	28.3	39.2
Expected return on plan assets	(43.1)	(41.5)	(48)
Amortization of prior service credits	(0.1)	(0.2)	(0.2)
Amortization of net loss	8.2	13	5.4
Settlement (gain) loss recognized	0.3		0.1
Net periodic (benefit) cost	$ (1.6)	$ 0.9	$ (2.5)

Pension Benefit Obligations -_2

Pension Benefit Obligations - AOCI (Details) $ in Millions	Sep. 30, 2018USD ($)
United States
Amounts included in AOCI that are expected to be recognized as components of net periodic benefit cost during the next fiscal year
Amortization of prior service credit	$ (0.1)
Amortization of net actuarial losses	(3.6)
Total	(3.7)
Foreign Pension Plan, Defined Benefit
Amounts included in AOCI that are expected to be recognized as components of net periodic benefit cost during the next fiscal year
Amortization of prior service credit	0.2
Amortization of net actuarial losses	(4.1)
Total	$ (3.9)

Pension Benefit Obligations -_3

Pension Benefit Obligations - Excess of Plan Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
United States
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets
Projected benefit obligation	$ 610.4	$ 658.4	$ 694.8
Accumulated benefit obligation	610.4	658.4	694.8
Fair values of plan assets	451.5	466.4	453.2
Expected employer contributions in next fiscal year	14.3
Foreign Pension Plan, Defined Benefit
Additional year-end information for pension plans with accumulated benefit obligations in excess of plan assets
Projected benefit obligation	1,002.6	1,158.3	1,220.3
Accumulated benefit obligation	991.9	1,145.7	1,215.7
Fair values of plan assets	760.7	$ 804.2	$ 782.1
Expected employer contributions in next fiscal year	$ 27.2

Pension Benefit Obligations -_4

Pension Benefit Obligations - Future payments (Details) $ in Millions	Sep. 30, 2018USD ($)
United States
Expected future benefit payments
2,019	$ 42.9
2,020	42.6
2,021	41.7
2,022	41.7
2,023	41.3
2024-2028	204.4
Total	414.6
Foreign Pension Plan, Defined Benefit
Expected future benefit payments
2,019	59
2,020	54.9
2,021	56.6
2,022	58.4
2,023	60.5
2024-2028	327.9
Total	$ 617.3

Pension Benefit Obligations - U

Pension Benefit Obligations - Underlying assumptions (Details)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
United States
Weighted-average assumptions to determine benefit obligation:
Discount rate (as a percent)	4.15%	3.64%	3.41%
Weighted-average assumptions to determine net periodic benefit cost:
Discount rate (as a percent)	3.60%	3.41%	4.10%
Expected long-term rate of return on plan assets (as a percent)	7.00%	7.00%	6.72%
Foreign Pension Plan, Defined Benefit
Weighted-average assumptions to determine benefit obligation:
Discount rate (as a percent)	2.91%	2.67%	2.35%
Salary increase rate (as a percent)	2.79%	2.76%	2.61%
Weighted-average assumptions to determine net periodic benefit cost:
Discount rate (as a percent)	2.67%	2.35%	3.80%
Salary increase rate (as a percent)	2.76%	2.61%	2.65%
Expected long-term rate of return on plan assets (as a percent)	4.73%	5.10%	5.74%

Pension Benefit Obligations - T

Pension Benefit Obligations - Target Allocation and Plan Assets (Details)	Sep. 30, 2018	Sep. 30, 2017
United States
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	100.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	100.00%	100.00%
United States | Equity securities
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	40.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	40.00%	43.00%
United States | Debt
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	51.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	50.00%	47.00%
United States | Cash and cash equivalents
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	1.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	1.00%	1.00%
United States | Property And Other
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	8.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	9.00%	9.00%
Foreign Pension Plan, Defined Benefit
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	100.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	100.00%	100.00%
Foreign Pension Plan, Defined Benefit | Equity securities
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	25.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	38.00%	27.00%
Foreign Pension Plan, Defined Benefit | Debt
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	35.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	36.00%	38.00%
Foreign Pension Plan, Defined Benefit | Cash and cash equivalents
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	10.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	7.00%	2.00%
Foreign Pension Plan, Defined Benefit | Property And Other
Target Allocations by Asset Category
Target Allocations by Asset Category (as a percent)	30.00%
Percentage of Plan Assets by Category
Plan Assets by Asset Category (as a percent)	19.00%	33.00%

Pension Benefit Obligations -_5

Pension Benefit Obligations - Asset Categories (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Post-retirement plan
Fair values of plan assets	$ 1,421.4	$ 1,463.5
Cash and cash equivalents
Post-retirement plan
Fair values of plan assets	71.7	22.9
Equity and debt securities
Post-retirement plan
Fair values of plan assets	153.4	7.9
Diversified and equity funds
Post-retirement plan
Fair values of plan assets	152	180
Fixed Income Funds
Post-retirement plan
Fair values of plan assets	55.3	153.7
Hedge Funds
Post-retirement plan
Fair values of plan assets	15	14
Common collective funds
Post-retirement plan
Fair values of plan assets	951	1,068.9
Assets held by Insurance Company
Post-retirement plan
Fair values of plan assets	30	31.3
Derivative instruments
Post-retirement plan
Fair values of plan assets	(7)	(15.2)
Level 1
Post-retirement plan
Fair values of plan assets	276.5	29.2
Level 1 | Cash and cash equivalents
Post-retirement plan
Fair values of plan assets	37.1	13.1
Level 1 | Equity and debt securities
Post-retirement plan
Fair values of plan assets	153.4	6.2
Level 1 | Diversified and equity funds
Post-retirement plan
Fair values of plan assets	82.4	6.4
Level 1 | Fixed Income Funds
Post-retirement plan
Fair values of plan assets	3.6	3.5
Level 2
Post-retirement plan
Fair values of plan assets	148.9	320.1
Level 2 | Cash and cash equivalents
Post-retirement plan
Fair values of plan assets	34.6	9.8
Level 2 | Equity and debt securities
Post-retirement plan
Fair values of plan assets		1.7
Level 2 | Diversified and equity funds
Post-retirement plan
Fair values of plan assets	69.6	173.6
Level 2 | Fixed Income Funds
Post-retirement plan
Fair values of plan assets	51.7	150.2
Level 2 | Derivative instruments
Post-retirement plan
Fair values of plan assets	(7)	(15.2)
Level 3
Post-retirement plan
Fair values of plan assets	45	45.3	$ 43.3
Level 3 | Hedge Funds
Post-retirement plan
Fair values of plan assets	15	14
Level 3 | Assets held by Insurance Company
Post-retirement plan
Fair values of plan assets	30	31.3
Investments measured at NAV
Post-retirement plan
Fair values of plan assets	951	1,068.9
Investments measured at NAV | Common collective funds
Post-retirement plan
Fair values of plan assets	$ 951	$ 1,068.9

Pension Benefit Obligations - L

Pension Benefit Obligations - Level 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	$ 1,463.5
Fair value of plan assets at end of year	1,421.4	$ 1,463.5
Common collective funds
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	1,068.9
Fair value of plan assets at end of year	951	1,068.9
Level 3
Changes in the fair value of Level 3 assets
Fair value of plan assets at beginning of year	45.3	43.3
Actual return on plan assets, relating to assets still held at reporting date	0.4	(0.7)
Purchases, sales and settlements	0.2	1.7
Change due to exchange rate changes	(0.9)	1
Fair value of plan assets at end of year	$ 45	$ 45.3

Pension Benefit Obligations - M

Pension Benefit Obligations - Multiemployer (Details) - Multiemployer Pension Plans $ in Millions	12 Months Ended
	Sep. 30, 2018USD ($)plan	Sep. 30, 2017USD ($)
Multiemployer Pension Plans
Number of minimum construction-industry pension plans participated | plan	200
Aggregate contributions to plans | $	$ 49.8	$ 48.8

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Oct. 17, 2014
Debt
Total debt	$ 3,673,500	$ 3,896,400
Less: Current portion of debt and short-term borrowings	(143,100)	(142,000)
Less: Unamortized debt issuance costs	(46,700)	(52,300)
Long-term debt	3,483,746	3,702,109
2014 Credit Agreement
Debt
Total debt	1,433,800	908,700
2014 Senior Notes
Debt
Total debt	800,000	1,600,000
2017 Senior Notes
Debt
Total debt	1,000,000	1,000,000
URS Senior Notes
Debt
Total debt	247,900	247,700	$ 1,000,000
Other Debt
Debt
Total debt	$ 191,800	$ 140,000

Debt - Scheduled Maturities (De

Debt - Scheduled Maturities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Scheduled maturities of debt:
2,019	$ 143.1
2,020	92.5
2,021	341.5
2,022	304.9
2,023	458.8
Thereafter	2,332.7
Total debt	$ 3,673.5	$ 3,896.4

Debt - 2014 Credit Agreement (D

Debt - 2014 Credit Agreement (Details) $ in Millions, $ in Millions, $ in Millions	Oct. 01, 2019	Jul. 01, 2018	Mar. 13, 2018CAD ($)	Mar. 31, 2017	Sep. 29, 2016USD ($)	Sep. 30, 2018USD ($)	Mar. 13, 2018AUD ($)	Mar. 13, 2018USD ($)	Sep. 30, 2017USD ($)	Oct. 17, 2014USD ($)
Term loan A
Debt agreements
Borrowing capacity					$ 185
2014 Credit Agreement | Minimum | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)		0.25%
2014 Credit Agreement | Minimum | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)		1.25%
2014 Credit Agreement | Maximum | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)		1.00%
2014 Credit Agreement | Maximum | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)		2.00%
2014 Credit Agreement | Term loan A
Debt agreements
Borrowing capacity			$ 500				$ 250	$ 510
2014 Credit Agreement | Term loan A | Base Rate | USD
Debt agreements
Interest rate, basis spread (as a percent)			0.50%
2014 Credit Agreement | Term loan A | Euro currency rate | USD
Debt agreements
Interest rate, basis spread (as a percent)			1.50%
2014 Credit Agreement | Term loan B
Debt agreements
Borrowing capacity								600
2014 Credit Agreement | Term loan B | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)			0.75%
2014 Credit Agreement | Term loan B | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)			1.75%
2014 Credit Agreement | Revolving credit facility
Debt agreements
Borrowing capacity								$ 1,350		$ 1,050
Outstanding letters of credit						$ 28.7			$ 58.1
Remaining borrowing capacity under credit facility						$ 1,321.3			$ 991.9
2014 Credit Agreement | Revolving credit facility | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)			0.75%
2014 Credit Agreement | Revolving credit facility | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)			1.75%
2014 Credit Agreement | Line of Credit
Debt agreements
Borrowing capacity					$ 500
Consolidated leverage ratio	4		4.50	4.75	5	3.9
Consolidated interest coverage ratio						4.6

Debt - 2014 Senior Notes (Detai

Debt - 2014 Senior Notes (Details) - USD ($)	Mar. 16, 2018	Oct. 06, 2014	Sep. 30, 2018
The 2022 Notes
Debt
Redemption price equal to principal amount (in percent)	104.313%
Prepayment premium redemption			$ 34,500,000
2014 Senior Notes | The 2022 Notes
Debt
Principal amount		$ 800,000,000
Interest rate (as a percent)		5.75%
2014 Senior Notes | The 2024 Notes
Debt
Principal amount		$ 800,000,000
Interest rate (as a percent)		5.875%
Fair value of debt instrument			$ 844,000,000
2014 Senior Notes | The 2024 Notes | Prior to July 15 2024
Debt
Redemption price equal to principal amount (in percent)		100.00%
2014 Senior Notes | The 2024 Notes | On or after July 15, 2024
Debt
Redemption price equal to principal amount (in percent)		100.00%

Debt - 2017 Senior Notes (Detai

Debt - 2017 Senior Notes (Details) - USD ($)	Feb. 21, 2017	Sep. 30, 2018
Term loan B
Debt
Amount of debt redeemed	$ 127,600,000
Term loan A
Debt
Amount of debt redeemed	600,000,000
Revolving credit facility
Debt
Amount of debt redeemed	250,000,000
2017 Senior Notes
Debt
Principal amount	$ 1,000,000,000
Fair value of debt instrument		$ 965,000,000
Interest rate (as a percent)	5.125%
2017 Senior Notes | At any time and from time to time prior to December 15, 2026
Debt
Redemption price equal to principal amount (in percent)	100.00%
2017 Senior Notes | At any time and from time to time prior to March 15, 2020
Debt
Maximum principal amount that can be redeemed using proceeds from equity offerings(in percent)	35.00%
Redemption price equal to principal using proceeds from equity offerings (in percent)	105.125%
2017 Senior Notes | At any time on or after December 15, 2026
Debt
Redemption price equal to principal amount (in percent)	100.00%

Debt - URS Senior Notes (Detail

Debt - URS Senior Notes (Details) - USD ($) $ in Millions	Oct. 24, 2014	Sep. 30, 2018	Sep. 30, 2017	Apr. 03, 2017	Feb. 21, 2017	Sep. 29, 2016	Oct. 17, 2014
Debt
Debt		$ 3,673.5	$ 3,896.4
Term loan A
Debt
Amount of debt redeemed					$ 600
Borrowing capacity						$ 185
URS Senior Notes
Debt
Debt		247.9	$ 247.7				$ 1,000
Redemption price equal to principal using proceeds from equity offerings (in percent)	101.00%
Amount of debt redeemed	$ 572.3
URS Senior Notes | 2017 URS Senior Notes
Debt
Interest rate (as a percent)							3.85%
Amount of debt redeemed				$ 179.2
URS Senior Notes | 2022 URS Senior Notes
Debt
Interest rate (as a percent)							5.00%
Debt		247.9
Fair value of debt instrument		$ 251

Debt - Other Debt and Other Ite

Debt - Other Debt and Other Items (Details) - Other Debt - Unsecured - Standby letter of credit - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Debt
Outstanding letters of credit	$ 486.4	$ 445.7
Remaining borrowing capacity under credit facility	$ 480.3

Debt - Effective Interest Rate

Debt - Effective Interest Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Debt
Effective interest rate including effects of interest rate swap agreements	4.6%	4.6%	4.4%
Amortization of deferred debt issuance costs	$ 18.1	$ 17.5
The 2022 Notes
Debt
Prepayment premium redemption	$ 34.5

Derivative Financial Instrume_3

Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) $ in Millions, $ in Millions	Sep. 30, 2018AUD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017AUD ($)	Sep. 30, 2017USD ($)
Interest Rate Swap February 2021 | AUD
Derivative financial instruments
Notional Amount		$ 200
Fixed Rate (as a percent)	2.19%	2.19%
Interest Rate Swap September 2022 | CAD
Derivative financial instruments
Notional Amount		$ 400
Fixed Rate (as a percent)	2.49%	2.49%
Interest Rate Swap February 2023 | USD
Derivative financial instruments
Notional Amount		$ 200
Fixed Rate (as a percent)	2.60%	2.60%
Interest Rate Swap June 2018 | USD
Derivative financial instruments
Notional Amount				$ 300
Fixed Rate (as a percent)			1.63%	1.63%
Interest Rate Swap September 2018 | USD
Derivative financial instruments
Notional Amount				$ 300
Fixed Rate (as a percent)			1.54%	1.54%
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency forward contracts | AUD
Derivative financial instruments
Notional Amount	$ 65.2	$ 49.1	$ 15.1	$ 11.3

Derivative Financial Instrume_4

Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Level 3
Derivative financial instruments
Fair value of contingent consideration liability	$ 11	$ 13
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements
Derivative financial instruments
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)	$ 0

Leases (Details)

Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Amounts payable under non-cancelable operating lease commitments
2,019	$ 253.3
2,020	211.5
2,021	165.8
2,022	136
2,023	111.8
Thereafter	433.6
Total	1,312
Leases, additional disclosures
Rent expense for all leases	$ 268.5	$ 265.9	$ 383.7

Stockholders' Equity (Details)

Stockholders' Equity (Details) - Accelerated Share Repurchase - JPMorgan - USD ($) shares in Millions, $ in Millions	Oct. 11, 2018	Sep. 30, 2018	Aug. 31, 2018
Common stock to be repurchased under ASR			$ 150
Number of shares repurchased	0.6	4

Share-Based Payments - Incentiv

Share-Based Payments - Incentive Plans (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Stock Incentive Plans
Compensation expense related to employer contributions to purchase AECOM stock under defined contribution plans, including the DCP	$ 32.3	$ 32.9	$ 26.8
Employee Stock Option
Stock Incentive Plans
Securities available for future issuance (in shares)	12.6
Expiration term of unexercised options	7 years
Number of Options
Balance at the beginning of the period (in shares)	0.7	0.9	1.3
Exercised (in shares)	(0.1)	(0.2)	(0.4)
Balance at the end of the period (in shares)	0.6	0.7	0.9
Exercisable at the end of the period (in shares)		0.1	0.3
Stock options, Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 31.11	$ 30.36	$ 28.26
Exercised (in dollars per share)	27.79	26.42	23.96
Balance at the end of the period (in dollars per share)	$ 31.62	31.11	30.36
Exercisable at the end of the period (in dollars per share)		$ 27.79	$ 26.99

Share-Based Payments - Exercisa

Share-Based Payments - Exercisable Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Compensation expense
Allocated Share-based Compensation Expense	$ 73.1	$ 83.8	$ 73.4
Unrecognized compensation expense	$ 94.3	96.8
Vesting period	3 years
Employee Stock Option
Stock Incentive Plans, additional disclosures
Aggregate intrinsic value of stock options exercised	$ 0.9	$ 1.2	$ 0.6
Compensation expense
Number of stock options granted during the period	0	0
Performance Earnings Program
Compensation expense
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 37.69	$ 38.15	$ 29.91
Performance period over which objectives must be met to qualify for an award grant	3 years
Restricted Stock Units (RSUs)
Compensation expense
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 36.83	$ 37.96	$ 29.82
$31.62 | Employee Stock Option
Options Outstanding
Number outstanding as of end of period (in shares)	600,000
Weighted Average Remaining Contractual Life	5 years 5 months 5 days
Weighted Average Exercise Price (in dollars per share)	$ 31.62
Aggregate Intrinsic Value (in millions)	$ 0.7

Income Taxes - Tax (Benefit) Ex

Income Taxes - Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Taxes
Income (loss) from domestic operations before income tax expense									$ 317,900	$ 322,200	$ 51,600
Income (loss) from foreign operations before income tax expense									(140,400)	107,000	74,000
Current:
Federal									(122,400)	10,300	33,700
State									19,000	17,900	12,400
Foreign									47,100	29,300	26,100
Total current income tax expense									(56,300)	57,500	72,200
Deferred:
Federal									14,500	(8,300)	(63,400)
State									39,000	10,400	(5,400)
Foreign									(16,800)	(51,900)	(41,300)
Total deferred income tax expense (benefit)									36,746	(49,856)	(110,122)
Total income tax (benefit) expense	$ 18,700	$ 33,100	$ (24,400)	$ (47,100)	$ 6,200	$ 12,100	$ (35,400)	$ 24,800	$ (19,643)	$ 7,706	$ (37,917)

Income Taxes - Federal Rate Rec

Income Taxes - Federal Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate
Tax at federal statutory rate										$ 43,500	$ 150,300	$ 43,900
State income tax, net of federal benefit										17,800	24,300	5,600
Valuation allowance										58,700	(51,200)	(54,800)
Impairment, nondeductible for tax										33,900
Foreign residual income										10,300		17,800
Foreign residual income											(9,200)
Nondeductible costs										3,500	5,800	6,100
Change in tax rates										100		34,600
Impact of changes in tax law										(47,800)
Income tax credits and incentives										(37,200)	(56,800)	(24,600)
Change in uncertain tax positions										(31,400)	9,500	(5,000)
Audit settlement										(27,700)
Return to provision, primarily foreign tax credits										(18,500)
Exclusion of tax on non-controlling interests										(14,900)	(28,200)	(24,700)
Tax exempt income										(7,400)	(17,900)	(17,600)
Foreign tax rate differential										(1,600)	(19,200)	(19,700)
Other items, net										(900)	300	500
Total income tax (benefit) expense	$ 18,700	$ 33,100	$ (24,400)	$ (47,100)	$ 6,200	$ 12,100	$ (35,400)	$ 24,800		$ (19,643)	$ 7,706	$ (37,917)
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate
Federal statutory rate (as a percent)				35.00%					21.00%	24.50%	35.00%	35.00%
State income tax, net of federal benefit (as a percent)										10.00%	5.70%	4.50%
Valuation allowance (as a percent)										33.10%	(11.90%)	(43.60%)
Impairment, nondeductible for tax (as a percent)										19.10%
Foreign residual income (as a percent)										5.80%		14.20%
Foreign residual income (as a percent)											(2.10%)
Nondeductible costs (as a percent)										1.90%	1.40%	4.80%
Change in tax rates (as a percent)										0.10%		27.60%
Impact of changes in tax law (as a percent)										(26.90%)
Income tax credits and incentive (as a percent)										(21.00%)	(13.20%)	(19.60%)
Change in uncertain tax positions (as a percent)										(17.70%)	2.20%	(4.00%)
Audit settlement (as a percent)										(15.60%)
Return to provision, primarily foreign tax credits (as a percent)										(10.40%)
Exclusion of tax on non-controlling interests (as a percent)										(8.40%)	(6.60%)	(19.70%)
Tax exempt income (as a percent)										(4.20%)	(4.20%)	(14.00%)
Foreign tax rate differential (as a percent)										(0.90%)	(4.50%)	(15.70%)
Other items, net (as a percent)										(0.50%)		0.30%
Total income tax expense (as a percent)										(11.10%)	1.80%	(30.20%)

Income Taxes - The Tax Cuts and

Income Taxes - The Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended	12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Income taxes
Federal corporate tax rate (as a percent)			35.00%		21.00%	24.50%	35.00%	35.00%
Provisional income tax benefit related to deferred tax assets and liabilities						$ 32
Undistributed earnings from foreign subsidiaries	$ 79.8				$ 79.8	79.8
One-time transition tax on accumulated foreign earnings						64
Valuation allowance	197.1				197.1	197.1	$ 138.4
Change in valuation allowance						58.7
Amount of uncertain tax positions for future years	27.7	$ 26.2
Benefits related to excess foreign tax credits expected to be realized							$ 25.2
United States
Income taxes
Valuation allowance	38.1				38.1	38.1
Canada
Income taxes
Valuation allowance	13.1				$ 13.1	$ 13.1
Change in valuation allowance	$ 13.1
United Kingdom
Income taxes
Change in valuation allowance				$ (59.9)
Europe
Income taxes
Benefit due to reinvesting portion of undistributed earnings									$ 21.2

Income Taxes - Deferred tax (De

Income Taxes - Deferred tax (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016
Deferred tax assets:
Compensation and benefit accruals not currently deductible	$ 108.3		$ 108.3	$ 144.2
Net operating loss carryforwards	252.4		252.4	338.2
Self insurance reserves	13.5		13.5	23.8
Research and experimentation and other tax credits	178.1		178.1	167.5
Pension liability	88.2		88.2	142.1
Accrued liabilities	63.4		63.4	160.7
Other	27.8		27.8	25
Total deferred tax assets	731.7		731.7	1,001.5
Deferred tax liabilities:
Unearned revenue	(121.1)		(121.1)	(190.8)
Depreciation and amortization	(135.9)		(135.9)	(158.6)
Acquired intangible assets	(56)		(56)	(121.7)
Investment in subsidiaries	(109.5)		(109.5)	(241.2)
Total deferred tax liabilities	(422.5)		(422.5)	(712.3)
Valuation allowance	(197.1)		(197.1)	(138.4)
Net deferred tax assets	112.1		112.1	150.8
Income Taxes, additional disclosures
Remaining gross tax asset exclusive of tax liabilities realized	534.6		534.6
Change in valuation allowance			58.7
Change in valuation allowance for foreign tax credits			36.3
Foreign net operating loss carryforwards	7.7		7.7
Gross book-tax differences from non-U.S. subsidiaries	1,700		1,700
Liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit	71.9		71.9	$ 109.5
Unrecognized tax benefits that would be included in the effective tax rate if recognized	42.4		42.4
United Kingdom
Income Taxes, additional disclosures
Change in valuation allowance		$ (59.9)
Canada
Deferred tax liabilities:
Valuation allowance	(13.1)		(13.1)
Income Taxes, additional disclosures
Change in valuation allowance	13.1
United States
Deferred tax liabilities:
Valuation allowance	(38.1)		(38.1)
California Franchise Tax Board | Enterprise Zone Tax Credits
Income Taxes, additional disclosures
Unused tax credits	6.8		6.8
Employee share-based payment adjustment
Income Taxes, additional disclosures
Net operating loss carryforwards					$ 3.8
Federal
Income Taxes, additional disclosures
Net operating loss carryforwards	50.3		50.3
Federal | Research and development
Income Taxes, additional disclosures
Unused tax credits	79.1		79.1
State
Income Taxes, additional disclosures
Net operating loss carryforwards	707		707
State | Research and development
Income Taxes, additional disclosures
Unused tax credits	33.4		33.4
Foreign
Income Taxes, additional disclosures
Net operating loss carryforwards	968.4		968.4
Unused tax credits	$ 61.8		$ 61.8

Income Taxes - Gross Unrecogniz

Income Taxes - Gross Unrecognized (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits
Balance at the beginning of the year	$ 102.1	$ 87.9
Gross increase in current period's tax positions	4	10.8
Gross increase in prior years' tax positions	2.2	5.3
Gross decrease in prior years' tax positions	(14.4)
Decrease due to settlement with tax authorities	(31.9)	(1)
Decrease due to lapse of statute of limitations	(1.7)	(1.1)
Gross change due to foreign exchange fluctuations	(0.3)	0.2
Balance at the end of the year	60	102.1
Income Taxes, additional disclosures
Accrued interest, excluding any related income tax benefits	15.5	15.1
Accrued penalties, excluding any related income tax benefits	$ 4.1	$ 4.1

Earnings Per Share (Details)

Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share
Denominator for basic earnings per share (in shares)	158,600	160,400	159,500	157,900	157,500	155,800	155,400	154,300	159,101	155,728	154,772
Potential common shares (in shares)									3,200	3,400	1,300
Denominator for diluted earnings per share (in shares)	161,800	163,200	159,500	161,800	161,100	158,800	158,700	158,000	162,261	159,135	156,073

Other Financial Information (De

Other Financial Information (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Accrued expenses and other current liabilities
Accrued salaries and benefits	$ 1,035,900	$ 1,018,500
Accrued contract costs	861,000	911,900
Other accrued expenses	370,100	315,100
Total accrued expenses	2,267,046	2,245,519
Accounts receivable-net	5,468,821	5,127,743
Accelerated recovery of pension entitlement
Accrued expenses and other current liabilities
Accounts receivable-net	50,000	50,000
Professional liability accrual
Accrued expenses and other current liabilities
Accrued contract costs	$ 519,500	$ 547,900

Reclassifications out of Accu_3

Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Accumulated balances
Balance at the beginning of the period	$ (700,661)	$ (857,600)	$ (635,100)
Other comprehensive income (loss) before reclassification	(13,200)	141,400	(233,900)
Amounts reclassified from accumulated other comprehensive income (loss)	10,600	15,500	11,400
Balance at the end of the period	(703,330)	(700,661)	(857,600)
Pension Related Adjustments
Accumulated balances
Balance at the beginning of the period	(281,900)	(368,900)	(204,000)
Other comprehensive income (loss) before reclassification	69,900	73,800	(171,500)
Amounts reclassified from accumulated other comprehensive income (loss)	9,700	13,200	6,600
Balance at the end of the period	(202,300)	(281,900)	(368,900)
Foreign Currency Translation Adjustments
Accumulated balances
Balance at the beginning of the period	(418,400)	(483,700)	(420,100)
Other comprehensive income (loss) before reclassification	(83,800)	65,300	(63,600)
Balance at the end of the period	(502,200)	(418,400)	(483,700)
Loss on Derivative Instruments
Accumulated balances
Balance at the beginning of the period	(400)	(5,000)	(11,000)
Other comprehensive income (loss) before reclassification	700	2,300	1,200
Amounts reclassified from accumulated other comprehensive income (loss)	900	2,300	4,800
Balance at the end of the period	$ 1,200	$ (400)	$ (5,000)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	May 24, 2018	Jul. 21, 2017	Jul. 03, 2017	Apr. 01, 2017	Sep. 30, 2017	Dec. 31, 2014	Sep. 30, 2018	Sep. 02, 2016
URS | Design build contractor
Commitments and Contingencies
Damages claimed, value	$ 11,900,000		$ 70,000,000	$ 8,200,000
AECOM USA, Inc. | Minimum | New York Department of Environmental Conservation
Commitments and Contingencies
Damages claimed, value					$ 100,000
Advatech LLC
Commitments and Contingencies
Percentage of ownership in joint venture							60.00%
Advatech LLC | Genco
Commitments and Contingencies
Damages claimed, value		$ 81,000,000
Invoice amount								$ 81,000,000
DOE Deactivation, Demolition, And Removal Project | Department of Energy | Maximum
Commitments and Contingencies
Cost-reimbursement at risk							$ 106,000,000
DOE Deactivation, Demolition, And Removal Project | WGI Ohio and DOE | Minimum
Commitments and Contingencies
Cost-reimbursement at risk							106,000,000
DOE Deactivation, Demolition, And Removal Project | WGI Ohio and DOE | Maximum
Commitments and Contingencies
Cost-reimbursement at risk							146,000,000
DOE Deactivation, Demolition, And Removal Project | WGI Ohio
Commitments and Contingencies
Claim to DOE, including additional fees						$ 103,000,000
Possible costs which may exceed contracted amounts						$ 100,000,000
DOE Deactivation, Demolition, And Removal Project | WGI Ohio | Minimum
Commitments and Contingencies
Cost-reimbursement at risk							146,000,000
AECOM-Canyon Equity Fund, L.P
Commitments and Contingencies
Capital commitments							$ 35,000,000
Term of capital commitments							10 years
Standby letter of credit
Commitments and Contingencies
Contingency liability							$ 515,100,000
Surety Bond
Commitments and Contingencies
Contingency liability							$ 5,300,000,000

Reportable Segments (Details)

Reportable Segments (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2018USD ($)segment	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Summarized financial information concerning the Company's reportable segments
Number of reportable segments | segment									4
Cost of revenue.	$ 5,117,800	$ 4,962,800	$ 4,649,700	$ 4,774,600	$ 4,686,300	$ 4,386,300	$ 4,258,800	$ 4,188,300	$ 19,504,863	$ 17,519,682	$ 16,768,001
Revenue	5,305,800	5,148,000	4,790,900	4,910,800	4,856,400	4,561,500	4,427,200	4,358,300	20,155,512	18,203,402	17,410,825
Gross profit	188,000	185,200	141,200	136,200	170,100	175,200	168,400	170,000	650,649	683,720	642,824
Equity in earnings of joint ventures	25,500	12,800	13,100	29,700	31,900	66,500	21,800	21,400	81,133	141,582	104,032
General and administrative expenses	(35,700)	(35,100)	(30,200)	(34,700)	(36,900)	(34,000)	(29,900)	(32,600)	(135,787)	(133,309)	(115,088)
Impairment on assets held for sale, including goodwill			(168,200)						(168,178)
Acquisition and integration expenses					(3,300)		(20,000)	(15,400)		(38,709)	(213,642)
(Loss) gain on disposal activities	(800)	(2,100)					600		(2,949)	572	(42,589)
Operating income (loss)	177,000	$ 160,800	$ (44,100)	$ 131,200	161,800	$ 207,700	$ 140,900	$ 143,400	424,868	653,856	375,537
Total assets	14,681,131				14,396,956				$ 14,681,131	$ 14,396,956	$ 13,669,900
Gross profit as a % of revenue									3.20%	3.80%	3.70%
Corporate
Summarized financial information concerning the Company's reportable segments
General and administrative expenses									$ (124,500)	$ (124,700)	$ (109,100)
Acquisition and integration expenses										(38,700)	(213,600)
Operating income (loss)									(124,500)	(163,400)	(322,700)
Total assets	613,500				386,200				613,500	386,200	586,200
Design and Consulting Services
Summarized financial information concerning the Company's reportable segments
Revenue									8,223,100	7,566,800	7,655,800
Gross profit									439,200	394,800	382,500
Equity in earnings of joint ventures									15,800	16,400	8,900
(Loss) gain on disposal activities										600
Operating income (loss)									455,000	411,800	391,400
Total assets	7,013,800				6,992,600				$ 7,013,800	$ 6,992,600	$ 6,655,700
Gross profit as a % of revenue									5.30%	5.20%	5.00%
Construction Services
Summarized financial information concerning the Company's reportable segments
Revenue									$ 8,238,900	$ 7,295,600	$ 6,371,100
Gross profit									40,400	92,900	25,400
Equity in earnings of joint ventures									21,500	22,400	18,200
Impairment on assets held for sale, including goodwill									(168,200)
(Loss) gain on disposal activities									(2,900)		(42,600)
Operating income (loss)									(109,200)	115,300	1,000
Total assets	4,212,000				4,114,500				$ 4,212,000	$ 4,114,500	$ 3,556,200
Gross profit as a % of revenue									0.50%	1.30%	0.40%
Management Services
Summarized financial information concerning the Company's reportable segments
Revenue									$ 3,693,500	$ 3,341,000	$ 3,383,900
Gross profit									171,000	196,000	234,900
Equity in earnings of joint ventures									28,600	45,100	76,900
Operating income (loss)									199,600	241,100	311,800
Total assets	2,701,200				2,704,600				$ 2,701,200	$ 2,704,600	$ 2,692,700
Gross profit as a % of revenue									4.60%	5.90%	6.90%
Management Services | Restatement Adjustment
Summarized financial information concerning the Company's reportable segments
Cost of revenue.										$ 124,000
Revenue										130,000
AECOM Capital
Summarized financial information concerning the Company's reportable segments
Equity in earnings of joint ventures									$ 15,200	57,700
General and administrative expenses									(11,200)	(8,700)	$ (6,000)
Operating income (loss)									4,000	49,000	(6,000)
Total assets	$ 140,600				$ 199,100				$ 140,600	$ 199,100	$ 179,100

Reportable Segments and Geograp

Reportable Segments and Geographic Information - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Geographic Information
Revenue	$ 5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	$ 4,856,400	$ 4,561,500	$ 4,427,200	$ 4,358,300	$ 20,155,512	$ 18,203,402	$ 17,410,825
Long-Lived Assets	7,486,500				7,543,400				7,486,500	7,543,400	7,554,500
United States
Geographic Information
Revenue									14,753,400	13,042,600	12,567,000
Long-Lived Assets	4,844,100				4,779,000				4,844,100	4,779,000	4,763,900
Asia Pacific
Geographic Information
Revenue									1,440,600	1,352,700	1,278,300
Long-Lived Assets	369,200				382,900				369,200	382,900	394,000
Canada
Geographic Information
Revenue									1,212,300	1,159,900	866,500
Long-Lived Assets	513,700				600,400				513,700	600,400	615,700
Europe
Geographic Information
Revenue									1,984,100	1,869,900	1,904,200
Long-Lived Assets	1,362,300				1,362,800				1,362,300	1,362,800	1,368,400
Other foreign countries
Geographic Information
Revenue									765,100	778,300	794,800
Long-Lived Assets	$ 397,200				$ 418,300				$ 397,200	$ 418,300	$ 412,500

Major Clients (Details)

Major Clients (Details) - Sales Revenue, Services, Net - Customer Concentration Risk	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Percentage of total revenue
Period for which criteria of threshold percentage for disclosure not met in past	5 years
Maximum
Percentage of total revenue
Percentage of revenue accounted for by no other single client (as a percent)	10.00%
Agencies of U.S. Federal Government
Percentage of total revenue
Concentration (as a percent)	23.00%	22.00%	23.00%
Agencies of U.S. Federal Government | Management Services
Percentage of total revenue
Concentration (as a percent)	2.00%	3.00%	3.00%

Quarterly Financial Informati_3

Quarterly Financial Information-Unaudited (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Quarterly Financial Information-Unaudited
Revenue	$ 5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	$ 4,856,400	$ 4,561,500	$ 4,427,200	$ 4,358,300	$ 20,155,512	$ 18,203,402	$ 17,410,825
Cost of revenue	5,117,800	4,962,800	4,649,700	4,774,600	4,686,300	4,386,300	4,258,800	4,188,300	19,504,863	17,519,682	16,768,001
Gross profit	188,000	185,200	141,200	136,200	170,100	175,200	168,400	170,000	650,649	683,720	642,824
Equity in earnings of joint ventures	25,500	12,800	13,100	29,700	31,900	66,500	21,800	21,400	81,133	141,582	104,032
General and administrative expenses	(35,700)	(35,100)	(30,200)	(34,700)	(36,900)	(34,000)	(29,900)	(32,600)	(135,787)	(133,309)	(115,088)
Less: Impairment of assets held for sale			(168,200)						(168,178)
Acquisition and integration expenses					(3,300)		(20,000)	(15,400)		(38,709)	(213,642)
(Loss) gain on disposal activities	(800)	(2,100)					600		(2,949)	572	(42,589)
Income from operations	177,000	160,800	(44,100)	131,200	161,800	207,700	140,900	143,400	424,868	653,856	375,537
Other income	2,600	2,700	12,500	2,300	2,500	2,100	1,300	800	20,135	6,636	8,180
Interest expense	(55,500)	(55,300)	(100,500)	(56,200)	(54,300)	(61,600)	(61,800)	(53,600)	(267,519)	(231,310)	(258,162)
Income before income tax (benefit) expense	124,100	108,200	(132,100)	77,300	110,000	148,200	80,400	90,600	177,484	429,182	125,555
Income tax (benefit) expense	18,700	33,100	(24,400)	(47,100)	6,200	12,100	(35,400)	24,800	(19,643)	7,706	(37,917)
Net income	105,400	75,100	(107,700)	124,400	103,800	136,100	115,800	65,800	197,127	421,476	163,472
Noncontrolling interests in income of consolidated subsidiaries, net of tax	(21,400)	(14,200)	(12,000)	(13,100)	(15,300)	(34,800)	(13,400)	(18,600)	(60,659)	(82,086)	(67,363)
Net income attributable to AECOM	$ 84,000	$ 60,900	$ (119,700)	$ 111,300	$ 88,500	$ 101,300	$ 102,400	$ 47,200	$ 136,468	$ 339,390	$ 96,109
Net (loss) income attributable to AECOM per share:
Basic (in dollars per share)	$ 0.53	$ 0.38	$ (0.75)	$ 0.70	$ 0.56	$ 0.65	$ 0.66	$ 0.31	$ 0.86	$ 2.18	$ 0.62
Diluted (in dollars per share)	$ 0.52	$ 0.37	$ (0.75)	$ 0.69	$ 0.55	$ 0.64	$ 0.65	$ 0.30	$ 0.84	$ 2.13	$ 0.62
Weighted average shares outstanding:
Basic (in shares)	158,600	160,400	159,500	157,900	157,500	155,800	155,400	154,300	159,101	155,728	154,772
Diluted (in shares)	161,800	163,200	159,500	161,800	161,100	158,800	158,700	158,000	162,261	159,135	156,073

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Debt (Details)	Oct. 06, 2014
Condensed Consolidating Financial Information
Ownership of directly and indirectly owned subsidiaries (as a percent)	100.00%

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
CURRENT ASSETS:
Total cash and cash equivalents	$ 886,733	$ 802,362
Accounts receivable-net	5,468,821	5,127,743
Prepaid expenses and other current assets	585,152	696,718
Current assets held for sale	59,800
Income taxes receivable	126,816	55,399
TOTAL CURRENT ASSETS	7,127,322	6,682,222
PROPERTY AND EQUIPMENT-NET	614,062	621,357
DEFERRED TAX ASSETS-NET	159,396	171,331
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	310,661	364,223
GOODWILL	5,921,116	5,992,881	$ 5,823,800
INTANGIBLE ASSETS-NET	319,892	415,096
OTHER NON-CURRENT ASSETS	228,682	149,846
TOTAL ASSETS	14,681,131	14,396,956	13,669,900
CURRENT LIABILITIES:
Short-term debt	8,353	1,221
Accounts payable	2,726,047	2,249,872
Accrued expenses and other current liabilities	2,267,046	2,245,519
Income taxes payable	39,802	38,176
Billings in excess of costs on uncompleted contracts	931,431	902,812
Current liabilities held for sale	22,300
Current portion of long-term debt	134,698	140,779
TOTAL CURRENT LIABILITIES	6,129,677	5,578,379
OTHER LONG-TERM LIABILITIES	742,100	881,300
DEFERRED TAX LIABILITY-NET	47,273	20,515
LONG-TERM DEBT	3,483,746	3,702,109
TOTAL LIABILITIES	10,402,757	10,182,270
TOTAL AECOM STOCKHOLDERS' EQUITY	4,092,780	3,996,126
Noncontrolling interests	185,594	218,560
TOTAL STOCKHOLDERS' EQUITY	4,278,374	4,214,686	$ 3,552,489	$ 3,630,943
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	14,681,131	14,396,956
Eliminations
CURRENT ASSETS:
Intercompany receivable	(1,193,900)	(996,000)
TOTAL CURRENT ASSETS	(1,193,900)	(996,000)
DEFERRED TAX ASSETS-NET	(124,600)	(294,600)
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	(8,276,100)	(9,419,000)
TOTAL ASSETS	(9,594,600)	(10,709,600)
CURRENT LIABILITIES:
Intercompany payable	(1,353,200)	(1,098,300)
TOTAL CURRENT LIABILITIES	(1,353,200)	(1,098,300)
DEFERRED TAX LIABILITY-NET	(124,700)	(294,600)
NOTE PAYABLE INTERCOMPANY-NON CURRENT	(1,288,400)	(467,300)
TOTAL LIABILITIES	(2,766,300)	(1,860,200)
TOTAL AECOM STOCKHOLDERS' EQUITY	(6,828,300)	(8,849,400)
TOTAL STOCKHOLDERS' EQUITY	(6,828,300)	(8,849,400)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	(9,594,600)	(10,709,600)
Parent | Reportable Legal Entities
CURRENT ASSETS:
Total cash and cash equivalents	22,000	32,600
Intercompany receivable	951,100	723,600
Prepaid expenses and other current assets	52,900	67,500
Income taxes receivable	84,600	4,300
TOTAL CURRENT ASSETS	1,110,600	828,000
PROPERTY AND EQUIPMENT-NET	202,600	160,200
DEFERRED TAX ASSETS-NET	134,000	239,700
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	6,364,100	6,606,200
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	13,400	7,200
OTHER NON-CURRENT ASSETS	49,900	8,700
TOTAL ASSETS	7,874,600	7,850,000
CURRENT LIABILITIES:
Short-term debt	8,400	1,100
Accounts payable	53,600	33,800
Accrued expenses and other current liabilities	58,800	92,200
Income taxes payable	10,400
Intercompany payable	105,500	149,200
Billings in excess of costs on uncompleted contracts	1,500	3,400
Current portion of long-term debt	43,300	110,900
TOTAL CURRENT LIABILITIES	281,500	390,600
OTHER LONG-TERM LIABILITIES	131,600	102,300
NOTE PAYABLE INTERCOMPANY-NON CURRENT	800,900	100
LONG-TERM DEBT	2,627,800	3,366,900
TOTAL LIABILITIES	3,841,800	3,859,900
TOTAL AECOM STOCKHOLDERS' EQUITY	4,032,800	3,990,100
TOTAL STOCKHOLDERS' EQUITY	4,032,800	3,990,100
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,874,600	7,850,000
Guarantor Subsidiaries | Reportable Legal Entities
CURRENT ASSETS:
Total cash and cash equivalents	270,900	254,900
Accounts receivable-net	2,544,700	2,426,400
Intercompany receivable	84,900	89,000
Prepaid expenses and other current assets	331,600	366,500
TOTAL CURRENT ASSETS	3,232,100	3,136,800
PROPERTY AND EQUIPMENT-NET	217,300	215,000
DEFERRED TAX ASSETS-NET		61,700
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	1,912,000	2,812,800
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	49,600	69,700
GOODWILL	3,392,700	3,392,700
INTANGIBLE ASSETS-NET	218,600	271,600
OTHER NON-CURRENT ASSETS	45,600	47,400
TOTAL ASSETS	9,067,900	10,007,700
CURRENT LIABILITIES:
Accounts payable	1,616,700	1,301,700
Accrued expenses and other current liabilities	1,035,600	1,171,800
Income taxes payable		8,100
Intercompany payable	830,800	789,500
Billings in excess of costs on uncompleted contracts	316,100	341,700
Current portion of long-term debt	27,000	14,900
TOTAL CURRENT LIABILITIES	3,826,200	3,627,700
OTHER LONG-TERM LIABILITIES	249,000	290,700
DEFERRED TAX LIABILITY-NET	63,100	600
LONG-TERM DEBT	291,400	281,600
TOTAL LIABILITIES	4,429,700	4,200,600
TOTAL AECOM STOCKHOLDERS' EQUITY	4,638,200	5,807,100
TOTAL STOCKHOLDERS' EQUITY	4,638,200	5,807,100
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	9,067,900	10,007,700
Non-Guarantor Subsidiaries | Reportable Legal Entities
CURRENT ASSETS:
Total cash and cash equivalents	593,800	514,900
Accounts receivable-net	2,924,100	2,701,300
Intercompany receivable	157,900	183,400
Prepaid expenses and other current assets	200,700	262,700
Current assets held for sale	59,800
Income taxes receivable	42,200	51,100
TOTAL CURRENT ASSETS	3,978,500	3,713,400
PROPERTY AND EQUIPMENT-NET	194,200	246,200
DEFERRED TAX ASSETS-NET	150,000	164,500
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	247,700	287,300
GOODWILL	2,528,400	2,600,200
INTANGIBLE ASSETS-NET	101,300	143,500
OTHER NON-CURRENT ASSETS	133,100	93,800
TOTAL ASSETS	7,333,200	7,248,900
CURRENT LIABILITIES:
Short-term debt		100
Accounts payable	1,055,700	914,400
Accrued expenses and other current liabilities	1,172,700	981,500
Income taxes payable	29,400	30,100
Intercompany payable	416,900	159,600
Billings in excess of costs on uncompleted contracts	613,800	557,700
Current liabilities held for sale	22,300
Current portion of long-term debt	64,400	15,000
TOTAL CURRENT LIABILITIES	3,375,200	2,658,400
OTHER LONG-TERM LIABILITIES	361,500	488,300
DEFERRED TAX LIABILITY-NET	108,900	314,500
NOTE PAYABLE INTERCOMPANY-NON CURRENT	487,500	467,200
LONG-TERM DEBT	564,500	53,600
TOTAL LIABILITIES	4,897,600	3,982,000
TOTAL AECOM STOCKHOLDERS' EQUITY	2,250,100	3,048,300
Noncontrolling interests	185,500	218,600
TOTAL STOCKHOLDERS' EQUITY	2,435,600	3,266,900
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 7,333,200	$ 7,248,900

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidating Statements of Operations
Revenue	$ 5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	$ 4,856,400	$ 4,561,500	$ 4,427,200	$ 4,358,300	$ 20,155,512	$ 18,203,402	$ 17,410,825
Cost of revenue	5,117,800	4,962,800	4,649,700	4,774,600	4,686,300	4,386,300	4,258,800	4,188,300	19,504,863	17,519,682	16,768,001
Gross profit	188,000	185,200	141,200	136,200	170,100	175,200	168,400	170,000	650,649	683,720	642,824
Equity in earnings of joint ventures	25,500	12,800	13,100	29,700	31,900	66,500	21,800	21,400	81,133	141,582	104,032
General and administrative expenses	(35,700)	(35,100)	(30,200)	(34,700)	(36,900)	(34,000)	(29,900)	(32,600)	(135,787)	(133,309)	(115,088)
Impairment on assets held for sale, including goodwill			(168,200)						(168,178)
Acquisition and integration expenses					(3,300)		(20,000)	(15,400)		(38,709)	(213,642)
(Loss) gain on disposal activities	(800)	(2,100)					600		(2,949)	572	(42,589)
Income from operations	177,000	160,800	(44,100)	131,200	161,800	207,700	140,900	143,400	424,868	653,856	375,537
Other income	2,600	2,700	12,500	2,300	2,500	2,100	1,300	800	20,135	6,636	8,180
Interest expense	(55,500)	(55,300)	(100,500)	(56,200)	(54,300)	(61,600)	(61,800)	(53,600)	(267,519)	(231,310)	(258,162)
Income before income tax (benefit) expense	124,100	108,200	(132,100)	77,300	110,000	148,200	80,400	90,600	177,484	429,182	125,555
Income tax (benefit) expense	18,700	33,100	(24,400)	(47,100)	6,200	12,100	(35,400)	24,800	(19,643)	7,706	(37,917)
Net income	105,400	75,100	(107,700)	124,400	103,800	136,100	115,800	65,800	197,127	421,476	163,472
Noncontrolling interests in income of consolidated subsidiaries, net of tax	(21,400)	(14,200)	(12,000)	(13,100)	(15,300)	(34,800)	(13,400)	(18,600)	(60,659)	(82,086)	(67,363)
Net income attributable to AECOM	$ 84,000	$ 60,900	$ (119,700)	$ 111,300	$ 88,500	$ 101,300	$ 102,400	$ 47,200	136,468	339,390	96,109
Eliminations
Condensed Consolidating Statements of Operations
Revenue									(110,300)	(52,300)	(82,000)
Cost of revenue									(110,300)	(52,300)	(82,000)
Equity in earnings from subsidiaries									(668,100)	(661,700)	(680,100)
Income from operations									(668,100)	(661,700)	(680,100)
Other income									(39,100)	(36,500)	(40,000)
Interest expense									39,100	36,500	40,000
Income before income tax (benefit) expense									(668,100)	(661,700)	(680,100)
Income tax (benefit) expense										31,700	37,300
Net income									(668,100)	(693,400)	(717,400)
Net income attributable to AECOM									(668,100)	(693,400)	(717,400)
Parent | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Equity in earnings from subsidiaries									460,900	439,300	437,400
General and administrative expenses									(124,400)	(124,700)	(114,000)
Acquisition and integration expenses										(38,700)	(213,600)
Income from operations									336,500	275,900	109,800
Other income									12,000	2,100	800
Interest expense									(242,900)	(203,700)	(231,700)
Income before income tax (benefit) expense									105,600	74,300	(121,100)
Income tax (benefit) expense									(31,100)	(264,900)	(217,300)
Net income									136,700	339,200	96,200
Net income attributable to AECOM									136,700	339,200	96,200
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Revenue									11,052,900	10,491,600	10,182,100
Cost of revenue									10,757,200	10,136,100	9,864,300
Gross profit									295,700	355,500	317,800
Equity in earnings from subsidiaries									207,200	222,400	242,700
Equity in earnings of joint ventures									37,200	43,800	38,400
General and administrative expenses											(1,100)
Income from operations									540,100	621,700	597,800
Other income									34,500	31,900	34,700
Interest expense									(25,100)	(31,100)	(29,000)
Income before income tax (benefit) expense									549,500	622,500	603,500
Income tax (benefit) expense									98,800	182,500	118,700
Net income									450,700	440,000	484,800
Net income attributable to AECOM									450,700	440,000	484,800
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Revenue									9,212,900	7,764,100	7,310,700
Cost of revenue									8,858,000	7,435,900	6,985,700
Gross profit									354,900	328,200	325,000
Equity in earnings of joint ventures									43,900	97,800	65,600
General and administrative expenses									(11,300)	(8,700)
Acquisition and integration expenses									(168,200)
(Loss) gain on disposal activities									(2,900)	600	(42,600)
Income from operations									216,400	417,900	348,000
Other income									12,700	9,200	12,700
Interest expense									(38,600)	(33,000)	(37,400)
Income before income tax (benefit) expense									190,500	394,100	323,300
Income tax (benefit) expense									(87,400)	58,400	23,400
Net income									277,900	335,700	299,900
Noncontrolling interests in income of consolidated subsidiaries, net of tax									(60,700)	(82,100)	(67,400)
Net income attributable to AECOM									$ 217,200	$ 253,600	$ 232,500

Condensed Consolidating Finan_6

Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 105,400	$ 75,100	$ (107,700)	$ 124,400	$ 103,800	$ 136,100	$ 115,800	$ 65,800	$ 197,127	$ 421,476	$ 163,472
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax									1,693	4,605	5,987
Foreign currency translation adjustments									(82,717)	65,389	(65,224)
Pension adjustments, net of tax									79,523	87,061	(164,911)
Other comprehensive (loss) income, net of tax									(1,501)	157,055	(224,148)
Comprehensive income, net of tax									195,626	578,531	(60,676)
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax									(61,827)	(82,220)	(65,697)
Comprehensive income (loss) attributable to AECOM, net of tax									133,799	496,311	(126,373)
Eliminations
Consolidated Statements of Comprehensive Income (Loss)
Net income									(668,100)	(693,400)	(717,400)
Other comprehensive income (loss), net of tax:
Comprehensive income, net of tax									(668,100)	(693,400)	(717,400)
Comprehensive income (loss) attributable to AECOM, net of tax									(668,100)	(693,400)	(717,400)
Parent | Reportable Legal Entities
Consolidated Statements of Comprehensive Income (Loss)
Net income									136,700	339,200	96,200
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax									2,300	4,900	2,600
Pension adjustments, net of tax									5,000	7,100	(3,300)
Other comprehensive (loss) income, net of tax									7,300	12,000	(700)
Comprehensive income, net of tax									144,000	351,200	95,500
Comprehensive income (loss) attributable to AECOM, net of tax									144,000	351,200	95,500
Guarantor Subsidiaries | Reportable Legal Entities
Consolidated Statements of Comprehensive Income (Loss)
Net income									450,700	440,000	484,800
Other comprehensive income (loss), net of tax:
Pension adjustments, net of tax									10,800	13,800	(14,900)
Other comprehensive (loss) income, net of tax									10,800	13,800	(14,900)
Comprehensive income, net of tax									461,500	453,800	469,900
Comprehensive income (loss) attributable to AECOM, net of tax									461,500	453,800	469,900
Non-Guarantor Subsidiaries | Reportable Legal Entities
Consolidated Statements of Comprehensive Income (Loss)
Net income									277,900	335,700	299,900
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on derivatives, net of tax									(600)	(300)	3,400
Foreign currency translation adjustments									(82,700)	65,400	(65,300)
Pension adjustments, net of tax									63,700	66,100	(146,700)
Other comprehensive (loss) income, net of tax									(19,600)	131,200	(208,600)
Comprehensive income, net of tax									258,300	466,900	91,300
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax									(61,900)	(82,200)	(65,700)
Comprehensive income (loss) attributable to AECOM, net of tax									$ 196,400	$ 384,700	$ 25,600

Condensed Consolidating Finan_7

Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidating Statements of Cash Flows
CASH FLOWS FROM OPERATING ACTIVITIES	$ 774,553	$ 696,654	$ 814,155
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from purchase price adjustment to business acquisition	2,203
Cash acquired from consolidation of joint venture	7,630
Payment for business acquisitions, net of cash acquired		(103,075)	(5,534)
Proceeds from disposal of businesses, net of cash disposed	19,537	2,200	39,699
Net investment in unconsolidated joint ventures	14,800	(24,300)	(71,500)
Net purchases of investments	(16,300)	900	11,500
Payments for capital expenditures, net of disposals	(86,900)	(78,400)	(136,800)
Net cash used in investing activities	(59,087)	(202,711)	(162,615)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	8,529,014	5,953,249	4,706,225
Repayments of borrowings under credit agreements	(8,040,262)	(7,071,602)	(5,199,961)
Issuance of unsecured senior notes		1,000,000
Redemption of unsecured senior notes	(800,000)	(179,208)
Prepayment penalty on unsecured senior notes	(34,504)
Cash paid for debt issuance costs	(12,181)	(13,041)	(10,447)
Proceeds from issuance of common stock	35,233	30,093	28,192
Proceeds from exercise of stock options	2,750	4,878	9,946
Payments to repurchase common stock under the share repurchase program	(150,000)
Payments to repurchase common stock	(29,466)	(25,078)	(25,892)
Net distributions to noncontrolling interests	(89,781)	(59,036)	(103,169)
Other financing activities	(35,671)	(26,745)	(42,873)
Net cash used in financing activities	(624,868)	(386,490)	(637,979)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(6,227)	2,764	(5,309)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	84,371	110,217	8,252
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	802,362	692,145	683,893
CASH AND CASH EQUIVALENTS AT END OF YEAR	886,733	802,362	692,145
Eliminations
CASH FLOWS FROM INVESTING ACTIVITIES:
Net (investment in) receipts from intercompany notes	838,700	(110,400)	(167,900)
Other intercompany investing activities	(1,550,300)	94,200	(931,500)
Net cash used in investing activities	(711,600)	(16,200)	(1,099,400)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings (repayments) on intercompany notes	(838,700)	110,400	167,900
Other intercompany financing activities	1,550,300	(94,200)	931,500
Net cash used in financing activities	711,600	16,200	1,099,400
Parent | Reportable Legal Entities
Condensed Consolidating Statements of Cash Flows
CASH FLOWS FROM OPERATING ACTIVITIES	(205,500)	(5,900)	(273,600)
CASH FLOWS FROM INVESTING ACTIVITIES:
Net investment in unconsolidated joint ventures	(6,100)
Payments for capital expenditures, net of disposals	(29,300)	(21,700)	(82,000)
Net (investment in) receipts from intercompany notes	(54,300)	(4,600)	5,300
Other intercompany investing activities	528,200	139,000	791,200
Net cash used in investing activities	438,500	112,700	714,500
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	7,770,400	5,903,500	4,673,000
Repayments of borrowings under credit agreements	(7,820,000)	(6,956,300)	(5,124,100)
Issuance of unsecured senior notes		1,000,000
Redemption of unsecured senior notes	(800,000)
Prepayment penalty on unsecured senior notes	(34,500)
Cash paid for debt and equity issuance costs	(12,200)	(13,000)	(10,400)
Proceeds from issuance of common stock	35,200	30,100	28,200
Proceeds from exercise of stock options	2,800	4,900	9,900
Payments to repurchase common stock under the share repurchase program	(150,000)
Payments to repurchase common stock	(29,500)	(25,100)	(25,900)
Other financing activities	(3,600)	(24,100)	7,900
Net borrowings (repayments) on intercompany notes	797,800	4,000	1,000
Net cash used in financing activities	(243,600)	(76,000)	(440,400)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(10,600)	30,800	500
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	32,600	1,800	1,300
CASH AND CASH EQUIVALENTS AT END OF YEAR	22,000	32,600	1,800
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Consolidating Statements of Cash Flows
CASH FLOWS FROM OPERATING ACTIVITIES	640,900	695,000	639,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Payment for business acquisitions, net of cash acquired			(1,000)
Net investment in unconsolidated joint ventures	(9,100)	(2,700)	(3,100)
Payments for capital expenditures, net of disposals	(39,100)	(30,600)	(59,500)
Net (investment in) receipts from intercompany notes	(778,800)	102,800	176,100
Other intercompany investing activities	1,022,100	(233,200)	140,300
Net cash used in investing activities	195,100	(163,700)	252,800
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	200	13,100	17,600
Repayments of borrowings under credit agreements	(18,000)	(51,100)	(22,800)
Redemption of unsecured senior notes		(179,200)
Other financing activities	(22,400)	(38,300)	(4,500)
Net borrowings (repayments) on intercompany notes	5,900	(16,300)	12,500
Other intercompany financing activities	(785,700)	(200,900)	(867,600)
Net cash used in financing activities	(820,000)	(472,700)	(864,800)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	16,000	58,600	27,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	254,900	196,300	169,300
CASH AND CASH EQUIVALENTS AT END OF YEAR	270,900	254,900	196,300
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Consolidating Statements of Cash Flows
CASH FLOWS FROM OPERATING ACTIVITIES	339,100	7,600	448,800
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from purchase price adjustment to business acquisition	2,200
Cash acquired from consolidation of joint venture	7,600
Payment for business acquisitions, net of cash acquired		(103,100)	(4,500)
Proceeds from disposal of businesses, net of cash disposed	19,500	2,200	39,700
Net investment in unconsolidated joint ventures	30,000	(21,600)	(68,400)
Net purchases of investments	(16,300)	900	11,500
Payments for capital expenditures, net of disposals	(18,500)	(26,100)	4,700
Net (investment in) receipts from intercompany notes	(5,600)	12,200	(13,500)
Net cash used in investing activities	18,900	(135,500)	(30,500)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	758,400	36,600	15,600
Repayments of borrowings under credit agreements	(202,200)	(64,200)	(53,100)
Net distributions to noncontrolling interests	(89,800)	(59,000)	(103,200)
Other financing activities	(9,700)	35,600	(46,300)
Net borrowings (repayments) on intercompany notes	35,000	(98,100)	(181,400)
Other intercompany financing activities	(764,600)	295,100	(63,900)
Net cash used in financing activities	(272,900)	146,000	(432,300)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(6,200)	2,800	(5,300)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	78,900	20,900	(19,300)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	514,900	494,000	513,300
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 593,800	$ 514,900	$ 494,000

Schedule II_ Valuation and Qu_2

Schedule II: Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Changes in valuation and qualifying accounts
Balance at Beginning of Year	$ 52.2	$ 60.4	$ 64.1
Additions Charged to Cost of Revenue	18.3	13.1	16.4
Deductions	(17.5)	(20.7)	(20.5)
Other and Foreign Exchange Impact	(1.4)	(0.6)	0.4
Balance at the End of the Year	$ 51.6	$ 52.2	$ 60.4