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Per Share Information (Tables) | 6 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended March 31, |  |  |  |
|  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |
Net income attributable to common stockholders of IES Holdings, Inc. |  | $ | 6,175 |  |  | $ |  | 5,467 |
Increase (decrease) in noncontrolling interest |  |  | (45) |  |  |  | — |
Net income attributable to restricted stockholders of IES Holdings, Inc. |  |  | 101 |  |  |  | 22 |
Net income attributable to IES Holdings, Inc. |  | $ | 6,231 |  |  | $ | 5,489 |
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 20,847,245 |  |  |  | 21,139,096 |
Effect of dilutive stock options and non-vested restricted stock |  |  | 275,065 |  |  |  | 240,650 |
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,122,310 |  |  |  | 21,379,746 |
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.30 |  | $ | 0.26
Diluted |  | $ | 0.29 |  | $ | 0.26
|  | Six Months Ended March 31, |  |  |  |
|  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |
Net income (loss) attributable to common stockholders of IES Holdings, Inc. |  | $ | 14,510 |  |  | $ | 12,348 |
Net income (loss) attributable to restricted stockholders of IES Holdings, Inc. |  |  | 223 |  |  |  | 25 |
Net income (loss) attributable to IES Holdings, Inc. |  | $ | 14,733 |  |  | $ | 12,373 |
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 20,865,460 |  |  |  | 21,187,834 |
Effect of dilutive stock options and non-vested restricted stock |  |  | 267,059 |  |  |  | 236,688 |
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,132,519 |  |  |  | 21,424,522 |
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.70 |  | $ | 0.58
Diluted |  | $ | 0.69 |  | $ | 0.58

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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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