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Business Combination (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May. 21, 2015 | Feb. 15, 2014 | Sep. 13, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Feb. 15, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 17,249 | $ 14,993 | $ 13,924 |
Goodwill Purchase Accounting Adjustments |  |  |  |  | 1,069 |  |
Residential [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 8,631 | 8,631 | 8,631 |
Goodwill Purchase Accounting Adjustments |  |  |  |  | 0 |  |
Business Acquisition Acro [Member] | Residential [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Name of Acquired Business |  |  |  | Acro Group |  |  |
Description of Acquired Business |  |  |  | sale, installation, and third-party financing of residential solar equipment |  |  |
Date of Acquisition |  |  |  | Feb. 15, 2013 |  |  |
Total Consideration Transferred |  | $ 4,798 |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 4,185
Contingent Consideration |  |  |  |  |  |  | $ 665
Gain on Contingent Consideration |  |  |  |  | 95 | $ 570 |
Business Acquistion Miscor [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Name of Acquired Business |  |  |  | MISCOR Group, Ltd. |  |  |
Description of Acquired Business |  |  |  | provider of maintenance and repair services including engine parts and components to the industrial and rail service industries. |  |  |
Date of Acquisition |  |  |  | Sep. 13, 2013 |  |  |
Goodwill |  |  |  |  | 6,362 |  |
Percent Of Acquiree Under Common Control Prior to Acquisition |  |  | 49.00% |  |  |  |
IES Shares provided in MISCOR consideration |  |  | 2,795,577 |  |  |  |
Value of IES Shares provided in MISCOR consideration |  |  | $ 11,853 |  |  |  |
Cash Purchase Consideration |  |  | $ 4,364 |  |  |  |
Goodwill Purchase Accounting Adjustments |  |  |  |  | 1,069 |  |
Business Acquistion Miscor [Member] | Deferred Tax Liability [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change In Accounting Estimate Description |  |  |  | is the result of the completion of our analysis of the tax basis of the acquired property, plant and equipment, which resulted in the recording of an additional deferred tax liability |  |  |
Goodwill Purchase Accounting Adjustments |  |  |  |  | 560 |  |
Business Acquistion Miscor [Member] | Work In Process Inventory [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change In Accounting Estimate Description |  |  |  | we completed our valuation of the acquired inventory, resulting in a $311 reduction in the estimated value previously attributed to work in process inventory. |  |  |
Goodwill Purchase Accounting Adjustments |  |  |  |  | 311 |  |
Business Acquistion Miscor [Member] | Current Liabilities [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change In Accounting Estimate Description |  |  |  | We also identified additional current liabilities of $198, resulting in a further increase to goodwill. |  |  |
Goodwill Purchase Accounting Adjustments |  |  |  |  | $ 198 |  |
Business Acquisition Southern Rewinding [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Name of Acquired Business |  |  |  | Southern Industrial Sales and Services, Inc. (“Southern Rewinding”) |  |  |
Description of Acquired Business |  |  |  | a Columbus, Georgia-based motor repair and related field services company |  |  |
Date of Acquisition |  |  |  | May 21, 2015 |  |  |
Additional Consideration To Be Paid | $ 800 |  |  |  |  |  |
Goodwill | 2,256 |  |  |  |  |  |
Cash Purchase Consideration | 3,137 |  |  |  |  |  |
Working Capital Transfer | $ 1,065 |  |  |  |  |  |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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