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Per Share Information EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share Reconciliation [Abstract]        
Net income (loss) attributable to common shareholders of IES Holdings, Inc. $ 8,513 $ 5,824 $ (18,788) $ 10,195
Net income attributable to restricted shareholders of IES Holdings, Inc. 3 44   81
Net income (loss) attributable to IES Holdings, Inc. $ 8,516 $ 5,868 $ (18,832) $ 10,276
Weighted average common shares outstanding - basic 21,200,635 21,300,716 21,193,306 21,295,254
Effect of dilutive stock options and non-vested restricted stock 131,248 255,402   255,550
Weighted average common and common equivalent shares sutstanding - diluted 21,331,883 21,556,118 21,193,306 21,550,804
Earnings (loss) per share attributable to IES Holdings, Inc.:        
Basic $ 0.4 $ 0.27 $ (0.89) $ 0.48
Diluted $ 0.4 $ 0.27 $ (0.89) $ 0.48
Decrease in noncontrolling interest     $ (44)  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     211,669