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Business Combination (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Feb. 08, 2013
Business Acquisition Acro [Member]
    
Business Acquisition [Line Items]    
Name of Acquired Business Acro Group  
Discription of Acquired Business a group of entities operating under the name of the Acro Group: Residential Renewable Technologies, Inc., Energy Efficiency Solar, Inc. and Lonestar Renewable Technologies Acquisition Corp. (collectively, the “Acro Group”).  
Reason for Business Combination offering full-service residential solar integration services, including design, procurement, permitting, installation, financing services through third parties and warranty services for residential customers.  
Prexisitng Relationship IES Residential had previously provided solar installation subcontracting services to the Acro Group  
Date of Acquisition Agreement Feb. 08, 2013  
Date of Acquisition Feb. 15, 2013  
Receivable Owed By Acro Used In Purchase Price   $ 3,800
Business Acquistion Miscor [Member]
    
Business Acquisition [Line Items]    
Name of Acquired Business MISCOR Group  
Discription of Acquired Business a provider of maintenance and repair services including engine parts and components to the industrial and rail services.  
Date of Acquisition Sep. 13, 2013  
Business Acquisition, Transaction Costs $ 3,034  
TaxBasisOfInvestmentsAdditionalInformation Although this goodwill is not deductible for tax purposes, we acquired tax basis of $8.6 million in goodwill and intangible assets recognized by MISCOR prior to our purchase agreement with them. The deferred tax asset associated with the basis is fully offset by a corresponding valuation allowance. No value was assigned in the purchase price allocation above to the original intangible assets recognized by MISCOR prior to our purchase agreement.