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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jul. 30, 2015
Jul. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]        
Debt instrument, effective interest rate     3.57%  
Hedging positions and payable amounts secured under credit facility     $ 15,300,000 $ 14,900,000
Letters of credit issued and outstanding     54,800,000 52,800,000
Availability in compliance with the fixed charge coverage ratio     176,000,000 149,600,000
Total restricted net assets     280,000,000 389,000,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility outstanding     $ 100,000,000 $ 0
8.875% Senior Notes        
Debt Instrument [Line Items]        
Effective interest rate     9.0  
Maturity date     2017-12  
Interest payment frequency     Semi-annual interest payments on June 1 and December 1 of each year.  
Third Amendment        
Debt Instrument [Line Items]        
Additional revolving credit $ 100,000,000      
Facility size that can be increased without consulting bank group $ 100,000,000      
Term loan annual payment percentage 25.00%      
Minimum fixed charge coverage ratio   110.00%    
Availability percentage to maximum facility size   12.50%    
Third Amendment | December through April        
Debt Instrument [Line Items]        
Commitment fee on the unused portion of the facility 0.30%      
Third Amendment | May through November        
Debt Instrument [Line Items]        
Commitment fee on the unused portion of the facility 0.20%      
Third Amendment | Quarterly        
Debt Instrument [Line Items]        
Term loan periodic payment $ 2,500,000      
Third Amendment | Maximum | Quarters ending June or September        
Debt Instrument [Line Items]        
Senior secured leverage ratio   300.00%    
Third Amendment | Maximum | Quarters ending December or March        
Debt Instrument [Line Items]        
Senior secured leverage ratio   450.00%    
Third Amendment | Maximum | Annually        
Debt Instrument [Line Items]        
Term loan periodic payment $ 15,000,000