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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($) | Jul. 30, 2015 | Jun. 30, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Hedging positions secured under credit facility |  |  | $ 4,900,000 | $ 300,000
Letters of credit issued and outstanding |  |  | 48,200,000 | 50,600,000
Long-term debt, fair value | [1] |  | 78,800,000 | 92,500,000
Availability in compliance with the fixed charge coverage ratio |  |  | $ 160,300,000 | 163,400,000
Third Amendment |  |  |  |
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 |  | $ 100,000,000 |  |
Revolving credit facility expiry |  | Jul. 30, 2020 |  |
Additional revolving credit |  | $ 100,000,000 |  |
Facility size that can be increased without consulting bank group |  | $ 100,000,000 |  |
Term loan annual payment percentage |  | 25.00% |  |
Debt instrument, effective interest rate |  |  | 4.01% |
Minimum fixed charge coverage ratio |  | 110.00% |  |
Availability percentage to maximum facility size |  | 12.50% |  |
Third Amendment | Quarterly |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan periodic payment |  | $ 2,500,000 |  |
Third Amendment | Annually | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan periodic payment |  | $ 15,000,000 |  |
Third Amendment | December through April |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee on the unused portion of the facility |  | 0.30% |  |
Third Amendment | May through November |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee on the unused portion of the facility |  | 0.20% |  |
Third Amendment | Quarters ending June or September | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior secured leverage ratio |  | 300.00% |  |
Third Amendment | Quarters ending December or March | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior secured leverage ratio |  | 450.00% |  |
Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, fair value | [1],[2] |  | $ 78,800,000 | 92,500,000
Term Loan | Third Amendment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding senior notes |  | $ 100,000,000 |  |
Senior secured term loan maturity period |  | 5 years |  |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility outstanding |  |  | $ 0 | $ 0
[1] | The face amount of the Partnership'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 June 30, 2017, and $0.9 million as of September 30, 2016.

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- Definition Availability in compliance with the fixed charge coverage ratio. + References No definition available. + Details
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- Definition Availability percentage to maximum facility size. + References No definition available. + Details
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- Definition Line Of Credit Facility Additional Borrowing Capacity For Working Capital Needs + References No definition available. + Details
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- Definition Line Of Credit Facility Increase Additional Borrowing Capacity + References No definition available. + Details
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- Definition Line of credit facility maximum borrowing capacity during the heating season. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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