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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) - USD ($)
$ in Thousands
Sep. 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 $ 935 $ 2,342
Net Assets (Liabilities) Presented in the Statement of Financial Position (12,819) (12,358)
Net Amount (500)  
Subject to an enforceable master netting arrangement    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 31,603 26,263
Gross Liabilities Offset in the Statement of Financial Position (44,489) (36,279)
Net Assets (Liabilities) Presented in the Statement of Financial Position (12,886) (10,016)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (12,886) (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 25,693 23,921
Gross Liabilities Offset in the Statement of Financial Position (38,512) (36,279)
Net Assets (Liabilities) Presented in the Statement of Financial Position (12,819) (12,358)
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount (12,819) (12,358)
Subject to an enforceable master netting arrangement | Other long-term liabilities    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 4,975  
Gross Liabilities Offset in the Statement of Financial Position (5,977)  
Net Assets (Liabilities) Presented in the Statement of Financial Position (1,002)  
Financial Instruments 0  
Cash Collateral Received 0  
Net Amount (1,002)  
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 935 2,342
Gross Liabilities Offset in the Statement of Financial Position 0 0
Net Assets (Liabilities) Presented in the Statement of Financial Position 935 2,342
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount $ 935 $ 2,342