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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
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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.

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- Definition Availability in compliance with the fixed charge coverage ratio. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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