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Commitments And Contingencies (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Commitments And Contingencies [Abstract]    
Accrued Insurance $ 4,765 $ 4,518
Liability for Claims and Claims Adjustment Expense 285 $ 464
Estimated cost of completion of bonded project 55,706  
Purchase Commitment Amount 804  
Insurance Related [Member]    
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount 6,347  
Vendor Related [Member]    
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount $ 571  
Capstone [Member]    
Loss Contingency [Line Items]    
LossContingencyNameOfPlaintiff Capstone Building Corporation (“Capstone”)  
Loss Contingency, Damages Sought, Value $ 9,600  
LossContingencyOpinionOfCounsel To date, the Company has not established a reserve with respect to this matter, as we believe the likelihood of our responsibility for damages is not probable and a potential range of exposure is not reasonably estimable.  
Ward Transformer Site [Member]    
Loss Contingency [Line Items]    
Litigation Settlement Amount $ 15