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Per Share Information EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share Reconciliation [Abstract]    
Net income attributable to common shareholders of IES Holdings, Inc. $ 3,841 $ 5,745
Net income attributable to restricted shareholders of IES Holdings, Inc. 31 54
Net income attirbutable to IES Holding, Inc. $ 3,872 $ 5,799
Weighted Average Number of Shares Outstanding, Basic 21,286,090 21,269,543
Effect of dilutive stock options and non-vested restricted stock 271,748 77,951
Weighted Average Number of Shares Outstanding, Diluted 21,557,838 21,347,494
Earnings per share attributable to IES Holdings, Inc.:    
Earnings Per Share, Basic $ 0.18 $ 0.27
Earnings Per Share, Diluted $ 0.18 $ 0.27