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Per Share Information (Tables) | 9 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended June 30,
|  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net income attributable to common stockholders of IES Holdings, Inc. |  | $ | 10,826 |  |  | $ | 8,513 |
Net income attributable to restricted stockholders of IES Holdings, Inc. |  |  | 146 |  |  |  | 3 |
Net income attributable to IES Holdings, Inc. |  | $ | 10,972 |  |  | $ | 8,516 |
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,043,425 |  |  |  | 21,200,635 |
Effect of dilutive stock options and non-vested restricted stock |  |  | 257,810 |  |  |  | 131,248 |
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,301,235 |  |  |  | 21,331,883 |
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.52 |  |  | $ | 0.40 |
Diluted |  | $ | 0.52 |  |  | $ | 0.40 |
|  | Nine Months Ended June 30,
|  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net income (loss) attributable to common stockholders of IES Holdings, Inc. |  | $ | 23,210 |  |  | $ | (18,788 | )
Decrease in noncontrolling interest |  |  | — |  |  |  | (44 | )
Net income (loss) attributable to restricted stockholders of IES Holdings, Inc. |  |  | 135 |  |  |  | — |
Net income (loss) attributable to IES Holdings, Inc. |  | $ | 23,345 |  |  | $ | (18,832 | )
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 21,139,697 |  |  |  | 21,193,306 |
Effect of dilutive stock options and non-vested restricted stock |  |  | 242,481 |  |  |  | — |
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,382,178 |  |  |  | 21,193,306 |
Earnings (loss) per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 1.10 |  |  | $ | (0.89) |
Diluted |  | $ | 1.09 |  |  | $ | (0.89) |

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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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