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Per Share Information (Tables) | 6 Months Ended
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Mar. 31, 2019
Per Share Information [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted [Table Text Block] |
|  | Three Months Ended March 31,
|  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net income attributable to common stockholders of IES Holdings, Inc. |  | $ | 5,467 |  | $ | 2,250
Decrease in noncontrolling interest |  |  | - |  |  | (44)
Net income attributable to restricted stockholders of IES Holdings, Inc. |  |  | 22 |  |  | 15
Net income attributable to IES Holdings, Inc. |  | $ | 5,489 |  | $ | 2,221
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,139,096 |  |  | 21,182,268
Effect of dilutive stock options and non-vested restricted stock |  |  | 240,650 |  |  | 258,302
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,379,746 |  |  | 21,440,570
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.26 |  | $ | 0.11
Diluted |  | $ | 0.26 |  | $ | 0.11
|  | Six Months Ended March 31,
|  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net income (loss) attributable to common stockholders of IES Holdings, Inc. |  | $ | 12,348 |  | $ | (27,304)
Decrease in noncontrolling interest |  |  | - |  |  | (44)
Net income (loss) attributable to restricted stockholders of IES Holdings, Inc. |  |  | 25 |  |  | -
Net income (loss) attributable to IES Holdings, Inc. |  | $ | 12,373 |  | $ | (27,348)
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,187,834 |  |  | 21,189,641
Effect of dilutive stock options and non-vested restricted stock |  |  | 236,688 |  |  | -
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,424,522 |  |  | 21,189,641
Earnings (loss) per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.58 |  | $ | (1.29)
Diluted |  | $ | 0.58 |  | $ | (1.29)

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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://fasb.org/us-gaap/role/ref/legacyRef -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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