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Partnership's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 - Commodity Contract - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts $ 15,489 $ 26,263
Derivative Liabilities, commodity contracts 17,310 (36,279)
Fair asset and fair liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 13,809 26,263
Fair liability and fair asset value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts 15,963 (36,279)
Long-term derivative assets included in the deferred charges and other assets, net balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 1,680  
Long-term derivative liabilities included in other long-term liabilities balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts 1,347  
Quoted Prices in Active Markets for Identical Assets Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 1,132 2,328
Derivative Liabilities, commodity contracts 944  
Quoted Prices in Active Markets for Identical Assets Level 1 | Fair asset and fair liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 1,076 2,328
Quoted Prices in Active Markets for Identical Assets Level 1 | Fair liability and fair asset value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts 890  
Quoted Prices in Active Markets for Identical Assets Level 1 | Long-term derivative assets included in the deferred charges and other assets, net balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 56  
Quoted Prices in Active Markets for Identical Assets Level 1 | Long-term derivative liabilities included in other long-term liabilities balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts 54  
Significant Other Observable Inputs Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 14,357 23,935
Derivative Liabilities, commodity contracts 16,366 (36,279)
Significant Other Observable Inputs Level 2 | Fair asset and fair liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 12,733 23,935
Significant Other Observable Inputs Level 2 | Fair liability and fair asset value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts 15,073 $ (36,279)
Significant Other Observable Inputs Level 2 | Long-term derivative assets included in the deferred charges and other assets, net balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 1,624  
Significant Other Observable Inputs Level 2 | Long-term derivative liabilities included in other long-term liabilities balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liabilities, commodity contracts $ 1,293