Consolidated Statement of Stockholders Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]
Balance at Sep. 30, 2017		$ 220	$ 6,898	$ 196,955	$ 46,427
Balance, shares at Sep. 30, 2017		22,049,529	(712,554)
Restricted stock grant			$ (3)	(3)
Restricted stock grant, shares			270
Non-cash compensation				364
Options Exercised (Value)			$ (15)	(4)
Options Exercised (Shares)			1,500
Net income (loss) attributable to IES Holdings, Inc.	$ (29,569)
Balance at Dec. 31, 2017					(29,569)
Balance at Sep. 30, 2018	$ 220,407	$ 220	$ 8,937	196,810	32,314
Balance, shares at Sep. 30, 2018		22,049,529	843,993
Restricted stock grant			$ (2,252)
Restricted stock grant, shares			(212,688)
Acquisition of Tresury Stock			$ (2,211)	2,252
Acquisition of Treasury Stock Shares	(212,688)		(132,121)
Non-cash compensation				$ 49
Net income (loss) attributable to IES Holdings, Inc.	$ 6,884				6,884
Cumulative Effect of ASU					$ 102