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Income Taxes - Schedule Of Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance, beginning of period $ 70,814 $ 51,767 $ 42,287
Gross increases related to prior period tax positions 4,816 14,867 8,664
Gross decreases related to prior period tax positions (10,538) 0 (1,051)
Gross increases related to current period tax positions 10,203 12,595 9,272
Decreases relating to settlements with tax authorities 0 (321) (3,578)
Reductions due to lapses of statute of limitations (8,455) (8,094) (3,827)
Balance, end of period $ 66,840 $ 70,814 $ 51,767