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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($)

12 Months Ended

Oct. 01, 2022

Jul. 06, 2022

Sep. 30, 2022

Sep. 30, 2021

Sep. 30, 2020

Debt Instrument [Line Items]

Additional loan repayments

$ 110,500,000

$ 13,000,000

$ 99,000,000

Hedging positions and payable amounts secured under credit facility

0

Letters of credit issued and outstanding

5,100,000

3,100,000

Long-term debt, fair value

^[1]

185,276,000

119,118,000

Revolving credit facility outstanding

20,276,000

8,618,000

Availability under credit agreement

189,400,000

171,500,000

Total restricted net assets

248,000,000.0

$ 268,200,000

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

550,000,000

Issuance of line of credit for working capital purposes

$ 25,000,000

Senior secured term loan maturity date

Jul. 06, 2027

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%

Availability percentage to maximum facility size

12.50%

Credit Agreement | 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

550.00%

Credit Agreement | Quarterly

Debt Instrument [Line Items]

Term loan periodic payment

$ 4,100,000

Credit Agreement | Annually | Maximum

Debt Instrument [Line Items]

Term loan periodic payment

8,500,000

Subsequent Event | Credit Agreement | Quarterly

Debt Instrument [Line Items]

Term loan periodic payment

$ 0

Term Loan

Debt Instrument [Line Items]

Additional loan repayments

$ 4,900,000

Debt instrument, effective interest rate

4.70%

4.30%

Long-term debt, fair value

^[1],[2]

$ 165,000,000

$ 110,500,000

Term Loan | Credit Agreement

Debt Instrument [Line Items]

Outstanding term loan

$ 165,000,000

Senior secured term loan maturity period

5 years

Revolving Credit Facility

Debt Instrument [Line Items]

Debt instrument, effective interest rate

2.60%

2.50%

Revolving credit facility outstanding

$ 20,300,000

$ 8,600,000

[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 $0.9 million as of September 30, 2022 and $0.5 million as of September 30, 2021.

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- Definition

Additional annual payment to term loan facility, percentage of excess cash flow.

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Availability percentage to maximum facility size.

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Availability under credit agreement.

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Debt instrument leverage ratio period one.

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Line of credit facility additional borrowing capacity for working capital needs.

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Line of credit facility maximum borrowing capacity during the heating season.

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Line of credit facility unused capacity commitment fee percentage period one.

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Line of credit facility unused capacity commitment fee percentage period two.

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Maximum increase allowed without bank consulting.

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Minimum fixed charge coverage ratio on revolving credit facilities.

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Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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