Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 101,445	$ 100,832
Accounts receivable	535,541	469,833
Accounts and Other Receivables, Net, Current	98,455	89,793
Inventories	108,775	101,728
Costs and estimated earnings in excess of billings	74,744	60,139
Prepaid expenses and other current assets	20,076	14,366
Total current assets	1,012,854	871,694
Property and equipment, net	164,362	134,197
Goodwill	95,295	93,960
Intangible assets, net	38,877	45,890
Equity Method Investments	44,900	0
Deferred tax assets	22,410	22,458
Operating right of use assets	77,169	61,956
Other non-current assets	13,855	13,871
Total assets	1,469,722	1,244,026
Accounts payable and accrued expenses	391,770	363,582
Billings in excess of costs and estimated earnings	154,803	158,972
Total current liabilities	546,573	522,554
Long-term debt	20,000	0
Operating long-term lease liabilities	52,668	40,445
Liability for Uncertainty in Income Taxes, Noncurrent	17,748	16,677
Other non-current liabilities	10,315	12,241
Total liabilities	647,304	591,917
Noncontrolling interest	40,977	40,996
Preferred stock, value	0	0
Common stock, value	220	220
Treasury stock, value	(127,700)	(90,325)
Additional paid-in capital	208,594	203,458
Retained earnings	700,327	497,760
Total stockholders' equity	781,441	611,113
Total liabilities and stockholders' equity	1,469,722	1,244,026
Marketable Securities, Current	66,815	35,003
Restricted Cash	$ 7,003	$ 0