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Per Share Information EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share Reconciliation [Abstract]        
Net income attributable to common shareholders of IES Holdings, Inc. $ 5,824 $ 10,747 $ 10,195 $ 18,641
Net income attributable to restricted shareholders of IES Holdings, Inc. 44 58 81 157
Net Income Loss $ 5,868 $ 10,805 $ 10,276 $ 18,798
Weighted Average Number of Shares Outstanding, Basic 21,300,716 21,297,898 21,295,254 21,280,469
Effect of dilutive stock options and non-vested restricted stock 255,402 158,736 255,550 131,874
Weighted Average Number of Shares Outstanding, Diluted 21,556,118 21,456,634 21,550,804 21,412,343
Earnings per share attributable to IES Holdings, Inc.:        
Earnings Per Share, Basic $ 0.27 $ 0.5 $ 0.48 $ 0.88
Earnings Per Share, Diluted $ 0.27 $ 0.5 $ 0.48 $ 0.87