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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Net Assets (Liabilities) Presented in the Statement of Financial Position $ 224 $ 2,342
Net Assets (Liabilities) Presented in the Statement of Financial Position (2,378) (12,358)
Subject to an enforceable master netting arrangement    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 15,489 26,263
Gross Liabilities Offset in the Statement of Financial Position (17,310) (36,279)
Net Assets (Liabilities) Presented in the Statement of Financial Position (1,821) (10,016)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (1,821) (10,016)
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 12,694 23,921
Gross Liabilities Offset in the Statement of Financial Position (15,072) (36,279)
Net Assets (Liabilities) Presented in the Statement of Financial Position (2,378) (12,358)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (2,378) (12,358)
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 1,114 2,342
Gross Liabilities Offset in the Statement of Financial Position (890)  
Net Assets (Liabilities) Presented in the Statement of Financial Position 224 2,342
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 224 $ 2,342
Subject to an enforceable master netting arrangement | Long-term derivative liabilities included in other long-term liabilities balance    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 26  
Gross Liabilities Offset in the Statement of Financial Position (27)  
Net Assets (Liabilities) Presented in the Statement of Financial Position (1)  
Financial Instruments 0  
Cash Collateral Received 0  
Net Amount (1)  
Subject to an enforceable master netting arrangement | Long-term derivative assets included in the deferred charges and other assets, net balance    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 1,655  
Gross Liabilities Offset in the Statement of Financial Position (1,321)  
Net Assets (Liabilities) Presented in the Statement of Financial Position 334  
Financial Instruments 0  
Cash Collateral Received 0  
Net Amount $ 334