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

Dec. 04, 2019

Sep. 30, 2020

Sep. 30, 2019

Debt Instrument [Line Items]

Hedging positions and payable amounts secured under credit facility

$ 11,100,000

$ 7,700,000

Letters of credit issued and outstanding

3,500,000

4,600,000

Long-term debt, fair value

^[1]

123,500,000

154,000,000

Revolving credit facility outstanding

24,000,000

Availability under credit agreement

203,400,000

126,100,000

Total restricted net assets

$ 245,800,000

$ 250,900,000

Credit Agreement

Debt Instrument [Line Items]

Non Seasonal maximum borrowing capacity under revolving credit facility

$ 300,000,000

Maximum borrowing capacity (heating season December to April) under revolving credit facility

450,000,000

Issuance of line of credit for working capital purposes

$ 25,000,000

Senior secured term loan maturity date

Dec. 04, 2024

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

450.00%

Credit Agreement | Quarterly

Debt Instrument [Line Items]

Term loan periodic payment

$ 3,250,000

Credit Agreement | Annually | Maximum

Debt Instrument [Line Items]

Term loan periodic payment

12,000,000

Term Loan

Debt Instrument [Line Items]

Debt instrument, effective interest rate

5.20%

5.90%

Long-term debt, fair value

^[1],[2]

$ 123,500,000

$ 92,500,000

Term Loan | Credit Agreement

Debt Instrument [Line Items]

Outstanding term loan

$ 130,000,000

Senior secured term loan maturity period

5 years

Revolving Credit Facility

Debt Instrument [Line Items]

Debt instrument, effective interest rate

4.00%

4.60%

Revolving credit facility outstanding

$ 0

$ 61,500,000

[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 $0.7 million as of September 30, 2020 and $0.6 million as of September 30, 2019.

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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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- Definition

Debt instrument leverage ratio period one.

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Debt instrument leverage ratio period two.

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X

- Definition

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

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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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.

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