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Per Share Information (Tables) | 3 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended December 31,
|  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net income attributable to common stockholders of IES Holdings, Inc. |  | $ | 8,337 |  |  | $ | 6,884 |
Increase (decrease) in noncontrolling interest |  |  | 45 |  |  |  | — |
Net income attributable to restricted stockholders of IES Holdings, Inc. |  |  | 120 |  |  |  | — |
Net income attributable to IES Holdings, Inc. |  | $ | 8,502 |  |  | $ | 6,884 |
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding — basic |  |  | 20,883,477 |  |  |  | 21,233,132 |
Effect of dilutive stock options and non-vested restricted stock |  |  | 264,835 |  |  |  | 27,933 |
Weighted average common and common equivalent shares outstanding — diluted |  |  | 21,148,312 |  |  |  | 21,261,065 |
Earnings per share attributable to IES Holdings, Inc.: |  |  |  |  |  |
Basic |  | $ | 0.40 |  |  | $ | 0.32 |
Diluted |  | $ | 0.39 |  |  | $ | 0.32 |

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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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