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Per Share Information (Tables) | 12 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Year Ended September 30,
| 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |
Net income (loss) attributable to common shareholders of IES Holdings, Inc. | $ | 32,950 |  |  | $ | (14,113 | ) |  | $ | 13,275 |
Increase (decrease) in noncontrolling interest | — |  |  | (44 | ) |  | 44 |
Net income attributable to restricted shareholders of IES Holdings, Inc. | 256 |  |  | — |  |  | 103 |
Net income (loss) attributable to IES Holdings, Inc. | $ | 33,206 |  |  | $ | (14,157 | ) |  | $ | 13,422 |
Denominator: |  |  |  |  |
Weighted average common shares outstanding — basic | 21,082,012 |  |  | 21,196,388 |  |  | 21,280,549 |
Effect of dilutive stock options and non-vested securities | 233,233 |  |  | — |  |  | 252,705 |
Weighted average common and common equivalent shares outstanding — diluted | 21,315,245 |  |  | 21,196,388 |  |  | 21,533,254 |
Earnings (loss) per share attributable to IES Holdings, Inc.: |  |  |  |  |
Basic | $ | 1.56 |  |  | $ | (0.67 | ) |  | $ | 0.62 |
Diluted | $ | 1.55 |  |  | $ | (0.67 | ) |  | $ | 0.62 |

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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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