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Quarterly Results Of Operations (Tables) | 12 Months Ended
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Sep. 30, 2017
Quarterly Results Of Operations (Unaudited) [Abstract] |
Quarterly Financial Information [Table Text Block] |
|  |  | Fiscal Year Ended September 30, 2017
|  |  | First |  | Second |  | Third |  | Fourth
|  |  | Quarter |  | Quarter |  | Quarter |  | Quarter
Revenues |  | $ | 192,178 |  | $ | 203,662 |  | $ | 208,323 |  | $ | 206,581
Gross profit |  | $ | 35,182 |  | $ | 31,814 |  | $ | 35,398 |  | $ | 38,104
Net income attributable to IES Holdings, Inc. |  | $ | 3,872 |  | $ | 536 |  | $ | 5,868 |  | $ | 3,146
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Basic |  | $ | 0.18 |  | $ | 0.02 |  | $ | 0.27 |  | $ | 0.15
| Diluted |  | $ | 0.18 |  | $ | 0.02 |  | $ | 0.27 |  | $ | 0.14
|  |  | Fiscal Year Ended September 30, 2016
|  |  | First |  | Second |  | Third |  | Fourth
|  |  | Quarter |  | Quarter |  | Quarter |  | Quarter
Revenues |  | $ | 150,766 |  | $ | 159,981 |  | $ | 179,599 |  | $ | 205,647
Gross profit |  | $ | 27,633 |  | $ | 27,812 |  | $ | 33,997 |  | $ | 37,538
Net income attributable to IES Holdings, Inc. |  | $ | 5,799 |  | $ | 2,194 |  | $ | 10,805 |  | $ | 101,980
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Basic |  | $ | 0.27 |  | $ | 0.10 |  | $ | 0.50 |  | $ | 4.75
| Diluted |  | $ | 0.27 |  | $ | 0.10 |  | $ | 0.50 |  | $ | 4.74

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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