Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 164,969	$ 167,935
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	71,371	76,893
Equity in earnings of unconsolidated joint ventures	(17,855)	(38,141)
Distribution of earnings from unconsolidated joint ventures	21,273	21,914
Non-cash stock compensation	27,404	19,690
Excess tax benefit from share-based payment	(1,754)	(1,133)
Foreign currency translation	(29,425)	570
Other	1,988	(2,854)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	95,452	(107,997)
Prepaid expenses and other assets	(18,259)	30,707
Accounts payable	(61,786)	58,164
Accrued expenses and other current liabilities	41,247	(14,151)
Billings in excess of costs on uncompleted contracts	(11,280)	37,111
Other long-term liabilities	(27,375)	(41,745)
Income taxes payable	(7,519)
Net cash provided by operating activities	248,451	206,963
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for business acquisitions, net of cash acquired	(37,269)	(12,571)
Net investment in unconsolidated joint ventures	2,320	(2,453)
Purchase of investments	(40,403)	(28,571)
Payments for capital expenditures	(37,067)	(47,805)
Other	2,724	2,525
Net cash used in investing activities	(109,695)	(88,875)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	1,847,723	1,077,136
Repayments of borrowings under credit agreements	(1,748,366)	(1,170,246)
Proceeds from issuance of common stock	11,801	11,436
Proceeds from exercise of stock options	10,509	3,902
Payments to repurchase common stock under the Repurchase Program	(314,144)	(100,023)
Payments for other repurchases of common stock	(8,000)	(7,137)
Excess tax benefit from share-based payment	1,754	1,133
Net distributions to noncontrolling interests	(13,556)	(870)
Net cash used in financing activities	(212,279)	(184,669)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(12,662)	8,035
NET DECREASE IN CASH AND CASH EQUIVALENTS	(86,185)	(58,546)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	593,776	456,940
CASH AND CASH EQUIVALENTS AT END OF PERIOD	507,591	398,394
NON-CASH INVESTING AND FINANCING ACTIVITY
Common stock issued in acquisitions	$ 14,322	$ 857