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Per Share Information (Tables)
12 Months Ended
Sep. 30, 2018
Per Share Information [Abstract]  
ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Year Ended September 30,
201820172016
Numerator:
Net income (loss) attributable to common shareholders of IES Holdings, Inc.$(14,113)$13,275$119,722
Increase (decrease) in noncontrolling interest(44)44-
Net income attributable to restricted shareholders of IES Holdings, Inc.-1031,056
Net income (loss) attributable to IES Holdings, Inc.$(14,157)$13,422$120,778
Denominator:
Weighted average common shares outstanding — basic21,196,38821,280,54921,279,342
Effect of dilutive stock options and non-vested restricted stock-252,705212,997
Weighted average common and common equivalent shares outstanding — diluted21,196,38821,533,25421,492,339
Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic$(0.67)$0.62$5.63
Diluted$(0.67)$0.62$5.62