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Derivative Financial Instruments - Changes in Net Unrealized Gains (Losses) on Cash Flow Hedges (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period $ (46,580) $ 13,773 $ 18,836
Changes in fair value of cash flow hedges, net of tax (32,655) (75,226) 24,239
Reclassification of (losses) gains into earnings, net of tax 44,558 14,873 (29,302)
Net unrealized (losses) gains on cash flow hedges, net of tax, end of period $ (34,677) $ (46,580) $ 13,773