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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