Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
CURRENT ASSETS:
Total cash and cash equivalents	$ 692,145	$ 683,893	$ 574,188	$ 600,677
Accounts receivable-net	4,531,460	4,841,450
Prepaid expenses and other current assets	730,101	388,982
Income taxes receivable	47,065	81,161
Deferred tax assets-net		250,599
TOTAL CURRENT ASSETS	6,000,771	6,246,085
PROPERTY AND EQUIPMENT-NET	644,992	699,322
DEFERRED TAX ASSETS-NET	171,508
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	330,485	321,625
GOODWILL	5,823,843	5,820,692	1,937,300
INTANGIBLE ASSETS-NET	479,439	659,438
OTHER NON-CURRENT ASSETS	275,707	267,136
TOTAL ASSETS	13,726,745	14,014,298	6,123,400
CURRENT LIABILITIES:
Short-term debt	26,303	2,788
Accounts payable	1,910,915	1,853,993
Accrued expenses and other current liabilities	2,384,800	2,167,800
Accrued taxes payable	10,774
Billings in excess of costs on uncompleted contracts	631,928	653,877
Current portion of long-term debt	340,021	157,623
TOTAL CURRENT LIABILITIES	5,304,756	4,836,052
OTHER LONG-TERM LIABILITIES	1,097,400	870,700
DEFERRED TAX LIABILITY-NET	13,097	230,037
LONG-TERM DEBT	3,758,966	4,446,527
TOTAL LIABILITIES	10,174,256	10,383,355
TOTAL AECOM STOCKHOLDERS' EQUITY	3,366,921	3,407,748
Noncontrolling interests	185,568	223,195
TOTAL STOCKHOLDERS' EQUITY	3,552,489	3,630,943	2,272,480	2,074,094
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	13,726,745	14,014,298
Reportable Legal Entities \| Parent
CURRENT ASSETS:
Total cash and cash equivalents	1,800	1,300	33,400	4,400
Intercompany receivable	760,700	771,300
Prepaid expenses and other current assets	98,700	36,700
Income taxes receivable	28,700	68,700
Deferred tax assets-net		36,600
TOTAL CURRENT ASSETS	889,900	914,600
PROPERTY AND EQUIPMENT-NET	169,300	93,400
DEFERRED TAX ASSETS-NET	265,200	27,100
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	6,031,700	6,739,400
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	700	800
OTHER NON-CURRENT ASSETS	65,200	88,700
TOTAL ASSETS	7,422,000	7,864,000
CURRENT LIABILITIES:
Short-term debt	3,100	2,300
Accounts payable	45,800	28,000
Accrued expenses and other current liabilities	201,200	229,500
Intercompany payable	114,100	119,900
Current portion of long-term debt	108,200	105,600
TOTAL CURRENT LIABILITIES	472,400	485,300
OTHER LONG-TERM LIABILITIES	115,700	63,600
LONG-TERM DEBT	3,468,000	3,914,000
TOTAL LIABILITIES	4,056,100	4,462,900
TOTAL AECOM STOCKHOLDERS' EQUITY	3,365,900	3,401,100
TOTAL STOCKHOLDERS' EQUITY	3,365,900	3,401,100
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,422,000	7,864,000
Reportable Legal Entities \| Guarantor Subsidiaries
CURRENT ASSETS:
Total cash and cash equivalents	183,700	162,500	85,800	80,200
Accounts receivable-net	2,034,000	2,165,500
Intercompany receivable	151,700	187,300
Prepaid expenses and other current assets	336,200	127,400
TOTAL CURRENT ASSETS	2,705,600	2,642,700
PROPERTY AND EQUIPMENT-NET	236,500	240,000
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	1,408,400	1,343,700
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	48,600	73,400
GOODWILL	3,286,600	3,291,100
INTANGIBLE ASSETS-NET	334,000	459,400
OTHER NON-CURRENT ASSETS	71,400	26,800
TOTAL ASSETS	8,091,100	8,077,100
CURRENT LIABILITIES:
Short-term debt	7,300
Accounts payable	907,000	834,100
Accrued expenses and other current liabilities	1,137,100	1,001,600
Intercompany payable	857,900	960,300
Billings in excess of costs on uncompleted contracts	237,500	255,700
Deferred tax liability-net		62,900
Current portion of long-term debt	222,100	24,500
TOTAL CURRENT LIABILITIES	3,368,900	3,139,100
OTHER LONG-TERM LIABILITIES	349,300	299,500
DEFERRED TAX LIABILITY-NET	236,600	122,600
LONG-TERM DEBT	273,400	482,700
TOTAL LIABILITIES	4,228,200	4,043,900
TOTAL AECOM STOCKHOLDERS' EQUITY	3,862,900	4,033,200
TOTAL STOCKHOLDERS' EQUITY	3,862,900	4,033,200
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	8,091,100	8,077,100
Reportable Legal Entities \| Non-Guarantor Subsidiaries
CURRENT ASSETS:
Total cash and cash equivalents	506,600	520,100	$ 455,000	$ 516,100
Accounts receivable-net	2,497,500	2,675,900
Intercompany receivable	152,000	262,700
Prepaid expenses and other current assets	295,200	224,900
Income taxes receivable	18,400	12,500
Deferred tax assets-net		276,900
TOTAL CURRENT ASSETS	3,469,700	3,973,000
PROPERTY AND EQUIPMENT-NET	239,200	365,900
DEFERRED TAX ASSETS-NET	129,800	7,300
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	58,400	67,400
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	281,200	247,400
GOODWILL	2,537,200	2,529,600
INTANGIBLE ASSETS-NET	145,400	200,000
OTHER NON-CURRENT ASSETS	139,100	151,700
TOTAL ASSETS	7,000,000	7,542,300
CURRENT LIABILITIES:
Short-term debt	15,900	500
Accounts payable	958,100	991,900
Accrued expenses and other current liabilities	1,046,500	936,700
Accrued taxes payable	10,800
Intercompany payable	208,800	319,800
Billings in excess of costs on uncompleted contracts	394,400	398,200
Current portion of long-term debt	9,700	27,500
TOTAL CURRENT LIABILITIES	2,644,200	2,674,600
OTHER LONG-TERM LIABILITIES	632,400	507,600
DEFERRED TAX LIABILITY-NET		141,900
NOTE PAYABLE INTERCOMPANY-NON CURRENT	563,500	669,100
LONG-TERM DEBT	17,600	49,800
TOTAL LIABILITIES	3,857,700	4,043,000
TOTAL AECOM STOCKHOLDERS' EQUITY	2,956,700	3,276,100
Noncontrolling interests	185,600	223,200
TOTAL STOCKHOLDERS' EQUITY	3,142,300	3,499,300
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,000,000	7,542,300
Eliminations
CURRENT ASSETS:
Intercompany receivable	(1,064,400)	(1,221,300)
Deferred tax assets-net		(62,900)
TOTAL CURRENT ASSETS	(1,064,400)	(1,284,200)
DEFERRED TAX ASSETS-NET	(223,500)	(34,400)
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES	(7,498,500)	(8,150,500)
TOTAL ASSETS	(8,786,400)	(9,469,100)
CURRENT LIABILITIES:
Intercompany payable	(1,180,800)	(1,400,000)
Deferred tax liability-net		(62,900)
TOTAL CURRENT LIABILITIES	(1,180,800)	(1,462,900)
DEFERRED TAX LIABILITY-NET	(223,500)	(34,400)
NOTE PAYABLE INTERCOMPANY-NON CURRENT	(563,500)	(669,100)
TOTAL LIABILITIES	(1,967,800)	(2,166,400)
TOTAL AECOM STOCKHOLDERS' EQUITY	(6,818,600)	(7,302,700)
TOTAL STOCKHOLDERS' EQUITY	(6,818,600)	(7,302,700)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (8,786,400)	$ (9,469,100)

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer) and accrued income taxes.

No definition available.