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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($) | Jul. 02, 2018 | Jul. 30, 2015 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Hedging positions and payable amounts secured under credit facility |  |  |  | $ 0 |  | $ 100,000
Letters of credit issued and outstanding |  |  |  | 7,100,000 |  | 48,000,000
Long-term debt, fair value |  |  |  | 101,500,000 | [1] | 76,300,000
Revolving credit facility outstanding |  |  |  | 1,500,000 |  |
Availability in compliance with the fixed charge coverage ratio |  |  |  | 189,000,000 |  | 166,100,000
Total restricted net assets |  |  |  | $ 299,800,000 |  | $ 296,200,000
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 |  |  |  | 5.20% |  | 4.10%
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 | Quarterly |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan periodic payment |  | $ 2,500,000 |  |  |  |
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 | Maximum | Annually |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan periodic payment |  | $ 15,000,000 |  |  |  |
Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | [2] |  |  | $ 100,000,000 | [1] | $ 76,300,000
Term Loan | Fourth Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding senior notes |  | $ 100,000,000 | $ 100,000,000 |  |  |
Senior secured term loan maturity period |  | 5 years | 5 years |  |  |
Term Loan | Third Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  | 76,300,000
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility outstanding |  |  |  | $ 1,500,000 |  | $ 0
Revolving Credit Facility | Fourth Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  | 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 September 30, 2018 and $0.6 million as of September 30, 2017.

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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 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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