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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Jul. 31, 2011
Jun. 30, 2014
Sep. 30, 2013
Jan. 14, 2014
Second Amendment
Jun. 30, 2014
Second Amendment
Jun. 30, 2014
Revolving Credit Facility
Jun. 30, 2014
8.875% Senior Notes
Jun. 30, 2014
8.875% Senior Notes
Second Amendment
Debt Instrument [Line Items]                
Non Seasonal maximum borrowing capacity under revolving credit facility       $ 300 $ 300      
Maximum borrowing capacity (heating season December to April) under revolving credit facility         450      
Issuance of line of credit for working capital purposes         100      
Alternate revolving credit facility expiry         Jan. 14, 2019      
Revolving credit facility expiry         Jun. 01, 2017      
Additional revolving credit         100      
Facility size that can be increased without consulting bank group         100      
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      
Maximum availability, condition two         150      
Minimum availability, condition two         75      
Maximum availability, condition three         75      
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      
Availability required to pay distributions       45 45      
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%
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
Letters of credit issued   52.5 44.7          
Revolving credit facility outstanding           39.5    
Availability in compliance with the fixed charge coverage ratio   120.9 164.3          
Available sale of offering of common units under shelf registration $ 250              
Shelf registration expiry Jul. 13, 2014