Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 498,481	$ 277,133
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	128,375	133,873
Equity in (earnings) losses of unconsolidated joint ventures	(15,555)	5,235
Distribution of earnings from unconsolidated joint ventures	52,144	15,141
Non-cash stock compensation	46,063	44,814
Loss on sale of discontinued operations	0	90,412
Foreign currency translation	5,604	3,670
Other	9,452	4,652
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable and contract assets	96,518	(514,407)
Prepaid expenses and other assets	(61,362)	20,613
Accounts payable	(160,641)	290,587
Accrued expenses and other current liabilities	167,562	164,926
Contract liabilities	(133,282)	72,917
Other long-term liabilities	(7,887)	(80,852)
Net cash provided by operating activities	625,472	528,714
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for business acquisition, net of cash acquired	(2,786)	(18,686)
Cash outflow from deconsolidation of a joint venture	(45,352)	0
Investment in unconsolidated joint ventures	(30,438)	(48,352)
Return of investment in unconsolidated joint ventures	3,042	0
Proceeds from sale of investments	0	3,180
Other investing activities	16,625	(27,100)
Proceeds from disposal of property and equipment	236	343
Payments for capital expenditures	(74,639)	(95,280)
Net cash used in investing activities	(133,312)	(185,895)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	1,931,502	5,319,563
Repayments of borrowings under credit agreements	(1,958,842)	(5,017,837)
Cash paid for debt issuance costs	(687)	(16,573)
Dividends paid	(99,149)	(85,391)
Proceeds from issuance of common stock	22,445	25,629
Payments to repurchase common stock	(138,324)	(163,147)
Net distributions to noncontrolling interests	(33,313)	(18,443)
Other financing activities	(5,235)	573
Net cash (used in) provided by financing activities	(281,603)	44,374
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(1,342)	(1,154)
NET INCREASE IN CASH AND CASH EQUIVALENTS	209,215	386,039
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,584,862	1,262,152
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,794,077	1,648,191
LESS CASH AND CASH EQUIVALENTS INCLUDED IN CURRENT ASSETS HELD FOR SALE	0	(3,379)
CASH AND CASH EQUIVALENTS OF CONTINUING OPERATIONS AT END OF PERIOD	$ 1,794,077	$ 1,644,812