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Per Share Information (Tables)
3 Months Ended
Dec. 31, 2017
Per Share Information [Abstract]  
Schedule Of Earnings Per Share Basic And Diluted [Table Text Block]
Three Months Ended December 31,
20172016
Numerator:
Net income (loss) attributable to common shareholders of IES Holdings, Inc.$(29,569)$3,841
Net income attributable to restricted shareholders of IES Holdings, Inc.-31
Net income (loss) attributable to IES Holdings, Inc.$(29,569)$3,872
Denominator:
Weighted average common shares outstanding — basic21,196,85421,286,090
Effect of dilutive stock options and non-vested restricted stock-271,748
Weighted average common and common equivalent shares outstanding — diluted21,196,85421,557,838
Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic$(1.39)$0.18
Diluted$(1.39)$0.18