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Business Combinations (Tables)
6 Months Ended
Mar. 31, 2018
Business Combinations [Abstract]  
Pro Forma Results of Operations
Unaudited
Three Months Ended March 31,
20182017
Revenues$205,677$210,557
Net income attributable to IES Holdings, Inc.$2,221$499

Unaudited
Six Months Ended March 31,
20182017
Revenues$403,977$410,371
Net income (loss) attributable to IES Holdings, Inc.$(27,348)$4,212