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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($)
Jul. 02, 2018
Jul. 30, 2015
Mar. 31, 2019
Sep. 30, 2018
Debt Instrument [Line Items]        
Non Seasonal maximum borrowing capacity under revolving credit facility $ 300,000,000      
Hedging positions and payable amounts secured under credit facility     $ 3,500,000 $ 0
Letters of credit issued and outstanding     7,100,000 7,100,000
Long-term debt, fair value [1]     212,500,000 101,500,000
Revolving credit facility outstanding     115,000,000 1,500,000
Availability in compliance with the fixed charge coverage ratio     174,400,000 189,000,000
Term Loan        
Debt Instrument [Line Items]        
Long-term debt, fair value [1],[2]     97,500,000 100,000,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility outstanding     $ 115,000,000 $ 1,500,000
Fourth Amendment        
Debt Instrument [Line Items]        
Non Seasonal maximum borrowing capacity under revolving credit facility 300,000,000 $ 300,000,000    
Maximum borrowing capacity (heating season December to April) under revolving credit facility 450,000,000 450,000,000    
Issuance of line of credit for working capital purposes $ 25,000,000      
Revolving credit facility expiry Jul. 02, 2023      
Additional revolving credit $ 200,000,000      
Facility size that can be increased without consulting bank group $ 200,000,000      
Term loan annual payment percentage 25.00%      
Debt instrument, effective interest rate     5.70% 5.20%
Commitment fee on the unused portion of the facility from December through April 0.30%      
Commitment fee on the unused portion of the facility from May through November 0.20%      
Minimum fixed charge coverage ratio 110.00%      
Availability percentage to maximum facility size 12.50%      
Fourth Amendment | Maximum        
Debt Instrument [Line Items]        
Senior secured leverage ratio during quarters ending June or September 300.00%      
Senior secured leverage ratio during quarters ending December or March 450.00%      
Fourth Amendment | Quarterly        
Debt Instrument [Line Items]        
Term loan periodic payment $ 2,500,000      
Fourth Amendment | Annually | Maximum        
Debt Instrument [Line Items]        
Term loan periodic payment 15,000,000      
Fourth Amendment | Term Loan        
Debt Instrument [Line Items]        
Outstanding senior notes $ 100,000,000 $ 100,000,000    
Senior secured term loan maturity period 5 years 5 years    
Fourth Amendment | Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument, effective interest rate     4.70% 3.80%
[1] The face amount of the Company’s variable rate long-term debt approximates fair value.
[2] Carrying amounts are net of unamortized debt issuance costs of $0.6 million as of March 31, 2019 and $0.7 million as of September 30, 2018.