Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 179,204	$ 108,594
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,297	43,322
Equity in (earnings) losses of unconsolidated joint ventures	(9,553)	28,941
Distribution of earnings from unconsolidated joint ventures	2,754	7,434
Non-cash stock compensation	16,823	15,052
Foreign currency translation	(28,671)	16,587
Other	(4,827)	547
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable and contract assets	161,509	(183,366)
Prepaid expenses and other assets	36,438	(11,754)
Accounts payable	(214,900)	(60,266)
Accrued expenses and other current liabilities	631	121,554
Contract liabilities	7,313	93,745
Other long-term liabilities	(37,929)	(37,327)
Net cash provided by operating activities	151,089	143,063
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for business acquisition, net of cash acquired	0	(18,686)
Investment in unconsolidated joint ventures	(976)	(13,797)
Return of investment in unconsolidated joint ventures	105	0
Proceeds from sale of investments	0	1,870
Other investing activities	16,250	0
Proceeds from disposal of property and equipment	94	69
Payments for capital expenditures	(40,215)	(56,245)
Net cash used in investing activities	(24,742)	(86,789)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	664,815	1,091,072
Repayments of borrowings under credit agreements	(673,769)	(1,106,061)
Cash paid for debt issuance costs	(687)	0
Dividends paid	(29,141)	(24,475)
Proceeds from issuance of common stock	5,693	9,678
Payments to repurchase common stock	(55,155)	(92,138)
Net distributions to noncontrolling interests	(29,609)	(4,778)
Other financing activities	(3,477)	422
Net cash used in financing activities	(121,330)	(126,280)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(5,153)	1,104
NET DECREASE IN CASH AND CASH EQUIVALENTS	(136)	(68,902)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,584,862	1,262,152
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,584,726	1,193,250
LESS CASH AND CASH EQUIVALENTS INCLUDED IN CURRENT ASSETS HELD FOR SALE	(4,070)	(990)
CASH AND CASH EQUIVALENTS OF CONTINUING OPERATIONS AT END OF PERIOD	$ 1,580,656	$ 1,192,260