Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 24,848	$ 23,105
Accounts receivable	370,726	286,707
Accounts and Other Receivables, Net, Current	65,065	41,341
Inventories	96,333	68,573
Costs and estimated earnings in excess of billings	52,076	43,389
Prepaid expenses and other current assets	15,350	21,065
Total current assets	624,398	484,180
Property and equipment, net	54,426	35,454
Goodwill	92,395	92,395
Intangible assets, net	71,936	85,619
Deferred tax assets	20,519	19,009
Operating right of use assets	55,890	42,916
Other non-current assets	15,145	7,049
Total assets	934,709	766,622
Accounts payable and accrued expenses	316,950	249,114
Billings in excess of costs and estimated earnings	84,936	62,486
Total current liabilities	401,886	311,600
Long-term debt	81,628	39,746
Operating long-term lease liabilities	38,144	28,649
Other non-current liabilities	22,570	16,080
Total liabilities	544,228	396,075
Noncontrolling interest	$ 29,193	$ 24,594
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred stock, value	$ 0	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	22,049,529	22,049,529
Common Stock, Shares, Outstanding	20,341,900	20,762,395
Common stock, value	$ 220	$ 220
Treasury Stock, Shares	1,707,629	1,287,134
Treasury stock, value	$ (44,000)	$ (29,300)
Additional paid-in capital	201,871	201,899
Retained earnings	203,197	173,134
Total stockholders' equity	361,288	345,953
Total liabilities and stockholders' equity	$ 934,709	$ 766,622