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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) (USD $) |  |  |  |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Revolving Credit Facility | Sep. 30, 2013 Revolving Credit Facility | Jan. 14, 2014 Second Amendment | Sep. 30, 2014 Second Amendment | Jan. 14, 2014 Second Amendment | Sep. 30, 2014 8.875% Senior Notes | Sep. 30, 2014 8.875% Senior Notes Second 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 |  |  |
Issuance of line of credit for working capital purposes |  |  |  |  |  | 100,000,000 |  |  |
Alternate revolving credit facility expiry |  |  |  |  |  | Jan. 14, 2019 |  |  |
Revolving credit facility expiry |  |  |  |  |  | Jun. 01, 2017 |  |  |
Additional revolving credit |  |  |  |  |  | 100,000,000 |  |  |
Facility size that can be increased without consulting bank group |  |  |  |  |  | 100,000,000 |  |  |
Line of credit facility description |  |  |  |  |  | All outstanding amounts owed under the second amended and restated credit facility become due and payable on the facility termination date of June 1, 2017. If the Partnership has repaid, prepaid or otherwise defeased at least $100 million of our 8.875% Senior Notes and Availability is equal to or greater than the aggregate amount required to repay the remaining outstanding 8.875% Senior Notes ("Payoff Amount"), then the facility termination date is January 14, 2019. |  |  |
Amount required to repaid, prepaid or defeased |  |  |  |  |  |  |  |  | 100,000,000
Description of variable rate |  |  |  |  |  | The interest rate on the second amended and restated credit facility is LIBOR plus (i) 1.75% (if Availability, as defined in the agreement is greater than or equal to $150 million), or (ii) 2.00% (if Availability is greater than $75 million but less than $150 million), or (iii) 2.25% (if Availability is less than or equal to $75 million). The Commitment Fee on the unused portion of the facility is 0.30% per annum. |  |  |
Condition one, additional interest rate based on LIBOR |  |  |  |  |  | 1.75% |  |  |
Condition two, additional interest rate based on LIBOR |  |  |  |  |  | 2.00% |  |  |
Condition three, additional interest rate based on LIBOR |  |  |  |  |  | 2.25% |  |  |
Minimum availability, condition one |  |  |  |  |  | 150,000,000 |  |  |
Maximum availability, condition two |  |  |  |  |  | 150,000,000 |  |  |
Minimum availability, condition two |  |  |  |  |  | 75,000,000 |  |  |
Maximum availability, condition three |  |  |  |  |  | 75,000,000 |  |  |
Commitment fee on the unused portion of the facility |  |  |  |  |  | 0.30% |  |  |
Availability percentage to maximum facility size |  |  |  |  |  | 12.50% |  |  |
Minimum fixed charge coverage ratio |  |  |  |  |  | 110.00% |  |  |
Availability required to make acquisition |  |  |  |  |  | 40,000,000 |  |  |
Availability required to pay distributions |  |  |  |  | 45,000,000 | 45,000,000 |  |  |
Percentage of the maximum facility size on a historical proforma and forward-looking basis |  |  |  |  | 15.00% | 15.00% |  |  |
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units |  |  |  |  | 115.00% | 115.00% |  |  |
Interest accrued by public notes for each year |  |  |  |  |  |  |  | 8.875% | 8.875%
Hedging positions and payable amounts secured under credit facility | 14,900,000 | 10,500,000 |  |  |  |  |  |  |
Letters of credit issued | 52,800,000 | 44,700,000 |  |  |  |  |  |  |
Revolving credit facility outstanding |  |  | 0 | 0 |  |  |  |  |
Availability in compliance with the fixed charge coverage ratio | 149,600,000 | 164,300,000 |  |  |  |  |  |  |
Total restricted net assets | $ 389,000,000 | $ 375,000,000 |  |  |  |  |  |  |

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