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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period $ 13,773 $ 18,836 $ 3,945
Changes in fair value of cash flow hedges, net of tax (75,226) 24,239 21,903
Reclassification of (losses) gains into earnings, net of tax 14,873 (29,302) (7,012)
Net unrealized (losses) gains on cash flow hedges, net of tax, end of period $ (46,580) $ 13,773 $ 18,836