Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Cash Flows [Abstract]
Net income (loss)	$ 100,388	$ 52,926
Bad debt expense	503	330
Deferred financing cost amortization	140	132
Depreciation and amortization	15,438	13,252
Gain (Loss) on Disposition of Property Plant Equipment	(1,444)	(13,162)
Non-cash compensation expense	2,925	1,956
Deferred income taxes	1,932	6,955
Unrealized Gain (Loss) on Investments	1,790	0
Accounts receivable	(53,324)	35,660
Inventories	(8,957)	(11,798)
Costs and estimated earnings in excess of billings	336	4,120
Prepaid expenses and other current assets	(35,252)	(11,672)
Other non-current assets	290	1,728
Accounts payable and accrued expenses	9,462	(30,454)
Billings in excess of costs and estimated earnings	23,996	10,109
Other non-current liabilities	470	(23)
Net cash provided by operating activities	58,693	60,059
Capital expenditures	(13,359)	(6,677)
Proceeds from sale of assets	2,375	19,124
Cash paid in conjunction with business combinations	(380)	(165)
Net cash used in investing activities	(11,364)	12,282
Borrowings of debt	1,346,388	1,162,971
Repayments of debt	(1,346,388)	(1,230,519)
Cash paid for finance leases	(1,981)	(1,617)
Payment for Contingent Consideration Liability, Financing Activities	4,074	0
Distribution to noncontrolling interest	(7,865)	(5,272)
Purchase of treasury stock	(3,218)	(7,637)
Options exercised	8	14
Net cash used in financing activities	(17,130)	(82,060)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	30,199	(9,719)
CASH, CASH EQUIVALENTS, beginning of period	75,770	24,848
CASH, CASH EQUIVALENTS, end of period	105,969	15,129
Cash paid for interest	269	1,765
Cash paid for income taxes (net)	$ 37,449	$ 4,660