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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, 2021
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period $ 18,836 $ 3,945 $ (26,608)
Changes in fair value of cash flow hedges, net of tax 24,239 21,903 19,228
Reclassification of (gain) loss into earnings, net of tax (29,302) (7,012) 11,325
Net unrealized gain (loss) on cash flow hedges, net of tax, end of period $ 13,773 $ 18,836 $ 3,945