Income Taxes - Summary of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income before income taxes	$ 205,249	$ 145,745	$ 298,403	$ 231,344
Provision for income taxes	$ 42,605	$ 31,300	$ 53,527	$ 50,512
Effective income tax rate	21.00%	21.00%	18.00%	22.00%

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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+ Details