Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 567,301	$ 405,871	$ 1,549,403	$ 1,052,670
Cost of services	484,501	333,042	1,328,369	856,288
Gross profit	82,800	72,829	221,034	196,382
Selling, general and administrative expenses	67,090	50,342	189,922	140,783
Contingent consideration	70	69	208	142
Loss (gain) on sale of assets	3	(32)	(70)	(24)
Operating income (loss)	15,637	22,450	30,974	55,481
Interest expense	761	240	1,740	637
Other (income) expense, net	202	(79)	843	(248)
Income (loss) from operations before income taxes	14,674	22,289	28,391	55,092
Provision for (benefit from) income taxes	3,609	2,640	6,297	9,890
Net income (loss)	11,065	19,649	22,094	45,202
Net income attributable to noncontrolling interest	(1,600)	(348)	(3,577)	(967)
Comprehensive income attributable to IES Holdings, Inc.	$ 9,465	$ 19,301	$ 18,517	$ 44,235
Earnings Per Share, Basic	$ 0.33	$ 0.93	$ 0.73	$ 2.11
Earnings Per Share, Diluted	$ 0.33	$ 0.92	$ 0.71	$ 2.08
Weighted Average Number of Shares Outstanding, Basic	20,718,195	20,829,165	20,730,900	20,780,975
Weighted Average Number of Shares Outstanding, Diluted	20,939,437	21,087,779	21,275,826	21,066,489