Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 87,456	$ 75,770
Accounts receivable	388,556	363,836
Accounts and Other Receivables, Net, Current	80,781	76,934
Inventories	113,774	95,655
Costs and estimated earnings in excess of billings	40,646	48,620
Prepaid expenses and other current assets	16,378	10,481
Total current assets	727,591	671,296
Property and equipment, net	65,423	63,410
Goodwill	92,395	92,395
Intangible assets, net	53,141	56,208
Deferred tax assets	20,280	20,383
Operating right of use assets	62,560	61,761
Other non-current assets	20,629	16,147
Total assets	1,042,019	981,600
Accounts payable and accrued expenses	294,947	296,797
Billings in excess of costs and estimated earnings	126,962	103,771
Total current liabilities	421,909	400,568
Long-term debt	0	0
Operating long-term lease liabilities	42,337	42,098
Liability for Uncertainty in Income Taxes, Noncurrent	22,312	22,047
Other non-current liabilities	11,849	16,951
Total liabilities	498,407	481,664
Noncontrolling interest	54,969	49,951
Preferred stock, value	0	0
Common stock, value	220	220
Treasury stock, value	(49,521)	(49,450)
Additional paid-in capital	203,986	203,431
Retained earnings	333,958	295,784
Total stockholders' equity	488,643	449,985
Total liabilities and stockholders' equity	$ 1,042,019	$ 981,600