Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 109,790	$ 78,300
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	85,176	80,828
Equity in earnings of unconsolidated joint ventures	(16,519)	(23,384)
Distribution of earnings from unconsolidated joint ventures	13,407	16,705
Non-cash stock compensation	21,719	24,622
Impairment of long-lived assets		95,814
Loss on sale of discontinued operations	45,586	50,117
Foreign currency translation	14,588	(8,304)
Other	8,059	5,378
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable and contract assets	139,651	259,059
Prepaid expenses and other assets	67,791	(281,745)
Accounts payable	(197,252)	(242,527)
Accrued expenses and other current liabilities	74,731	25,495
Contract liabilities	(62,417)	35,325
Other long-term liabilities	(111,082)	(49,429)
Net cash provided by operating activities	193,228	66,254
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for sale of discontinued operations including cash disposed	(43,690)	(259,933)
Investment in unconsolidated joint ventures	(12,335)	(40,086)
Return of investment in unconsolidated joint ventures	1,731	2,880
Proceeds from sale of investments	8,312	11,792
Proceeds from disposal of property and equipment	579	10,120
Payments for capital expenditures	(48,489)	(87,265)
Net cash used in investing activities	(93,892)	(362,492)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	1,335,742	1,251,766
Repayments of borrowings under credit agreements	(1,363,012)	(1,229,856)
Cash paid for debt issuance costs	(155)	(4,321)
Dividends paid	(21,198)
Proceeds from issuance of common stock	12,034	11,531
Proceeds from exercise of stock options		4,038
Payments to repurchase common stock	(312,794)	(591,671)
Net distributions to noncontrolling interests	(5,471)	(6,799)
Other financing activities	(13,777)	(15,101)
Net cash used in financing activities	(368,631)	(580,413)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	1,674	4,665
NET DECREASE IN CASH AND CASH EQUIVALENTS	(267,621)	(871,986)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,234,792	1,818,249
CASH AND CASH EQUIVALENTS AT END OF PERIOD	967,171	946,263
LESS CASH AND CASH EQUIVALENTS INCLUDED IN CURRENT ASSETS HELD FOR SALE	(2,101)	(11,357)
CASH AND CASH EQUIVALENTS OF CONTINUING OPERATIONS AT END OF PERIOD	$ 965,070	$ 934,906