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Commitments And Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Commitments And Contingencies [Abstract]    
Accrued Insurance $ 5,464 $ 4,518
Liability for Claims and Claims Adjustment Expense 235 $ 464
Estimated cost of completion of bonded project 54,287  
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount 6,944  
Insurance Related [Member]    
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount 6,126  
Vendor Related [Member]    
Other Commitments [Line Items]    
Letters of Credit Outstanding, Amount $ 818  
Capstone [Member]    
Loss Contingencies [Line Items]    
Loss Contingency Name Of Plaintiff Capstone Building Corporation (“Capstone”)  
Loss Contingency, Damages Sought, Value $ 10,406  
Loss Contingency Opinion Of Counsel 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.