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Per Share Information (Tables) | 9 Months Ended
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Jun. 30, 2017
Per Share Information [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted [Table Text Block] |
|  | Three Months Ended June 30,
|  | 2017 |  | 2016
Numerator: |  |  |  |  |  |
Net income attributable to common shareholders of IES Holdings, Inc. |  | $ | 5,824 |  | $ | 10,747
Net income attributable to restricted shareholders of IES Holdings, Inc. |  |  | 44 |  |  | 58
Net income attributable to IES Holdings, Inc. |  | $ | 5,868 |  | $ | 10,805
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,300,716 |  |  | 21,297,898
Effect of dilutive stock options and non-vested restricted stock |  |  | 255,402 |  |  | 158,736
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,556,118 |  |  | 21,456,634
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.27 |  | $ | 0.50
Diluted |  | $ | 0.27 |  | $ | 0.50
|  | Nine Months Ended June 30,
|  | 2017 |  | 2016
Numerator: |  |  |  |  |  |
Net income attributable to common shareholders of IES Holdings, Inc. |  | $ | 10,195 |  | $ | 18,641
Net income attributable to restricted shareholders of IES Holdings, Inc. |  |  | 81 |  |  | 157
Net income attributable to IES Holdings, Inc. |  | $ | 10,276 |  | $ | 18,798
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,295,254 |  |  | 21,280,469
Effect of dilutive stock options and non-vested restricted stock |  |  | 255,550 |  |  | 131,874
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,550,804 |  |  | 21,412,343
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.48 |  | $ | 0.88
Diluted |  | $ | 0.48 |  | $ | 0.87

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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