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Derivatives and Hedging-Disclosures and Fair Value Measurements - Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - Subject to an enforceable master netting arrangement - USD ($)
$ in Thousands
Jun. 30, 2022
Sep. 30, 2021
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized $ 61,365 $ 31,383
Gross Liabilities Offset in the Statement of Financial Position (13,354) (3,601)
Net Assets (Liabilities) Presented in the Statement of Financial Position 48,011 27,782
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount 48,011 27,782
Fair asset value of derivative instruments    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 58,915 29,360
Gross Liabilities Offset in the Statement of Financial Position (13,047) (3,138)
Net Assets (Liabilities) Presented in the Statement of Financial Position 45,868 26,222
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount 45,868 26,222
Other long-term assets, net    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 2,446 2,023
Gross Liabilities Offset in the Statement of Financial Position (303) (463)
Net Assets (Liabilities) Presented in the Statement of Financial Position 2,143 1,560
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount 2,143 $ 1,560
Other long-term liabilities, net    
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]    
Gross Assets Recognized 4  
Gross Liabilities Offset in the Statement of Financial Position $ (4)