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Equity (Schedule of Performance Stock Activity) (Details) - $ / shares
12 Months Ended
Dec. 28, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Performance Stock Units        
Number of Shares        
Non-vested, beginning balance (in shares)   328,708    
Granted (in shares) 108,500 240,164   0
Vested (in shares)   (166,058)    
Forfeited (in shares)   (5,037)    
Non-vested, ending balance (in shares)   397,777 328,708  
Weighted Average Grant Date Fair Value        
Non-vested, beginning balance (in usd per share)   $ 8.36    
Granted (in usd per share)   7.62 $ 8.34  
Vested (in usd per share)   6.86    
Forfeited (in usd per share)   13.36    
Non-vested, ending balance (in usd per share)   $ 8.48 $ 8.36  
Performance Stock Awards        
Number of Shares        
Non-vested, beginning balance (in shares)   33,333    
Granted (in shares)   0    
Vested (in shares)   0    
Forfeited (in shares)   0    
Non-vested, ending balance (in shares)   33,333 33,333  
Weighted Average Grant Date Fair Value        
Non-vested, beginning balance (in usd per share)   $ 12.25    
Granted (in usd per share)   0.00    
Vested (in usd per share)   0.00    
Forfeited (in usd per share)   0.00    
Non-vested, ending balance (in usd per share)   $ 12.25 $ 12.25