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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($) | Jul. 02, 2018 | Jul. 30, 2015 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Hedging positions and payable amounts secured under credit facility |  |  |  | $ 20,200,000 | $ 0
Letters of credit issued and outstanding |  |  |  | 7,100,000 | 7,100,000
Long-term debt, fair value | [1] |  |  | 192,500,000 | 101,500,000
Revolving credit facility outstanding |  |  |  | 92,500,000 | 1,500,000
Availability in compliance with the fixed charge coverage ratio |  |  |  | 180,300,000 | 189,000,000
Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, fair value | [1],[2] |  |  | 100,000,000 | 100,000,000
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility outstanding |  |  |  | $ 92,500,000 | $ 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 |  |  |  | 5.80% | 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 |  |  |  | 5.10% | 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 $0.7 million as of December 31, 2018 and September 30, 2018.

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- Definition Availability in compliance with the fixed charge coverage ratio. + References No definition available. + Details
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