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Per Share Information (Tables) | 12 Months Ended
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Sep. 30, 2017
Per Share Information [Abstract] |
ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock |
|  | Years Ended September 30,
|  | 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to common shareholders of IES Holdings, Inc. |  | $ | 13,275 |  | $ | 119,722 |  | $ | 16,792
Increase in noncontrolling interest |  |  | 44 |  |  |  |  |  |
Net income from continuing operations attributable to restricted shareholders of IES Holdings, Inc. |  |  | 103 |  |  | 1,056 |  |  | 85
Net income from continuing operations of IES Holdings, Inc. |  | $ | 13,422 |  | $ | 120,778 |  | $ | 16,877
Net loss from discontinued operations attributable to common shareholders of IES Holdings, Inc. |  | $ | - |  | $ | - |  | $ | (339)
Net loss from discontinued operations of IES Holdings, Inc. |  | $ | - |  | $ | - |  | $ | (339)
Net income attributable to common shareholders |  | $ | 13,275 |  | $ | 119,722 |  | $ | 16,453
Increase in noncontrolling interest |  |  | 44 |  |  |  |  |  |
Net income attributable to restricted shareholders |  |  | 103 |  |  | 1,056 |  |  | 85
Net income of IES Holdings, Inc. |  | $ | 13,422 |  | $ | 120,778 |  | $ | 16,538
Denominator: |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,280,549 |  |  | 21,279,342 |  |  | 21,480,622
Effect of dilutive stock options and non-vested restricted stock |  |  | 252,705 |  |  | 212,997 |  |  | 45,566
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,533,254 |  |  | 21,492,339 |  |  | 21,526,188
Basic earnings (loss) per share attributable to IES Holdings, Inc.: |  |  |  |  |  |  |  |  |
Basic earnings per share from continuing operations |  | $ | 0.62 |  | $ | 5.63 |  | $ | 0.79
Basic loss per share from discontinued operations |  | $ | 0.00 |  | $ | 0.00 |  | $ | (0.02)
Basic earnings per share |  | $ | 0.62 |  | $ | 5.63 |  | $ | 0.77
Diluted earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |  |  |  |
Diluted earnings per share from continuing operations |  | $ | 0.62 |  | $ | 5.62 |  | $ | 0.79
Diluted loss per share from discontinued operations |  | $ | 0.00 |  | $ | 0.00 |  | $ | (0.02)
Diluted earnings per share |  | $ | 0.62 |  | $ | 5.62 |  | $ | 0.77

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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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