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Quarterly Results of Operations (Tables) | 12 Months Ended
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Sep. 30, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Table Text Block] | Quarterly financial information for the years ended September 30, 2019 and 2018 is summarized as follows:
| Year Ended September 30, 2019
| First |  | Second |  | Third |  | Fourth
| Quarter |  | Quarter |  | Quarter |  | Quarter
Revenues | $ | 243,842 |  |  | $ | 256,914 |  |  | $ | 282,633 |  |  | $ | 293,607 |
Gross profit | $ | 41,601 |  |  | $ | 43,235 |  |  | $ | 46,397 |  |  | $ | 50,870 |
Net income (loss) attributable to IES Holdings, Inc. | $ | 6,884 |  |  | $ | 5,489 |  |  | $ | 10,972 |  |  | $ | 9,861 |
Earnings (loss) per share: |  |  |  |  |  |  |
Basic | $ | 0.32 |  |  | $ | 0.26 |  |  | $ | 0.52 |  |  | $ | 0.47 |
Diluted | $ | 0.32 |  |  | $ | 0.26 |  |  | $ | 0.52 |  |  | $ | 0.46 |
| Year Ended September 30, 2018
| First |  | Second |  | Third |  | Fourth
| Quarter |  | Quarter |  | Quarter |  | Quarter
Revenues | $ | 198,300 |  |  | $ | 205,677 |  |  | $ | 232,576 |  |  | $ | 240,275 |
Gross profit | $ | 33,064 |  |  | $ | 33,840 |  |  | $ | 42,537 |  |  | $ | 40,521 |
Net income (loss) attributable to IES Holdings, Inc. | $ | (29,569 | ) |  | $ | 2,221 |  |  | $ | 8,516 |  |  | $ | 4,675 |
Earnings (loss) per share: |  |  |  |  |  |  |
Basic | $ | (1.39 | ) |  | $ | 0.11 |  |  | $ | 0.40 |  |  | $ | 0.22 |
Diluted | $ | (1.39 | ) |  | $ | 0.11 |  |  | $ | 0.40 |  |  | $ | 0.22 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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