Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 568,881	$ 501,593	$ 1,143,755	$ 982,102
Cost of services	467,955	443,086	947,391	843,868
Gross profit	100,926	58,507	196,364	138,234
Selling, general and administrative expenses	69,349	63,430	137,117	122,832
Contingent consideration	69	69	138	138
Loss (gain) on sale of assets	(102)	(68)	(13,162)	(73)
Operating income (loss)	31,610	(4,924)	72,271	15,337
Interest expense	1,049	543	2,233	979
Other (income) expense, net	(1,768)	(124)	(1,073)	641
Income (loss) from operations before income taxes	32,329	(5,343)	71,111	13,717
Provision for (benefit from) income taxes	8,157	(1,293)	18,185	2,688
Net income (loss)	24,172	(4,050)	52,926	11,029
Net income attributable to noncontrolling interest	(2,621)	(1,362)	(4,973)	(1,977)
Comprehensive income attributable to IES Holdings, Inc.	$ 21,551	$ (5,412)	$ 47,953	$ 9,052
Earnings Per Share, Basic	$ 0.93	$ (0.30)	$ 2.08	$ 0.39
Earnings Per Share, Diluted	$ 0.92	$ (0.30)	$ 2.06	$ 0.38
Weighted Average Number of Shares Outstanding, Basic	20,170,824	20,772,426	20,206,814	20,737,253
Weighted Average Number of Shares Outstanding, Diluted	20,387,796	20,772,426	20,414,492	21,139,429