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v3.25.1

Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 27, 2024 | Dec. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Debt Instrument [Line Items] |  |  |  |  |  |
Additional loan repayments |  |  |  | $ 5,250,000 | $ 12,250,000 |
Hedging positions and payable amounts secured under credit facility |  |  |  | 3,700,000 |  | $ 14,200,000
Letters of credit issued and outstanding |  |  |  | 5,200,000 |  | 5,200,000
Long-term debt, fair value | [1] |  |  | 221,848,000 |  | 210,005,000
Revolving credit facility outstanding |  |  |  | 22,348,000 |  | 5,000
Availability under credit agreement |  |  |  | $ 212,600,000 |  | $ 166,500,000
Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan annual payment percentage |  |  | 25.00% |  |  |
Additional loan repayments |  |  | $ 4,000,000.0 |  |  |
Debt instrument, effective interest rate |  |  |  | 7.10% |  | 7.20%
Long-term debt, fair value | [1],[2] |  |  | $ 199,500,000 |  | $ 210,000,000
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  | 6.30% |  | 7.50%
Revolving credit facility outstanding |  |  |  | $ 22,300,000 |  |
Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  | $ 400,000,000 |  |  |  |
Maximum borrowing capacity (heating season December to April) under revolving credit facility |  | 475,000,000 |  |  |  |
Issuance of line of credit for working capital purposes |  | $ 25,000,000 |  |  |  |
Senior secured term loan maturity date |  | Sep. 27, 2029 |  |  |  |
Facility size that can be increased additional without consulting bank group |  |  |  | 200,000,000 |  |
Facility size that can be increased without consulting bank group |  |  |  | $ 200,000,000 |  |
Term loan annual payment percentage |  | 25.00% |  |  |  |
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% |  |  |  |
Credit Agreement | Quarterly |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan periodic payment |  | $ 5,300,000 |  |  |  |
Credit Agreement | Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding term loan |  | $ 210,000,000 |  |  |  |
Senior secured term loan maturity period |  | 5 years |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility outstanding |  |  |  |  |  | $ 100,000
Maximum | Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Availability percentage to maximum facility size |  | 12.50% |  |  |  |
Maximum facility size |  | $ 35,000,000 |  |  |  |
Senior secured leverage ratio during quarters ending June or September |  | 300.00% |  |  |  |
Senior secured leverage ratio during quarters ending December or March |  | 550.00% |  |  |  |
Maximum | Credit Agreement | Annually |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan periodic payment |  | $ 4,000,000 |  |  |  |
[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 $1.0 million as of March 31, 2025 and $1.2 million as of September 30, 2024

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