Income Taxes - Schedule Of Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of period	$ 86,877	$ 79,167	$ 66,840
Gross increases related to prior period tax positions	5,292	7,939	4,270
Gross decreases related to prior period tax positions	(2,381)	(7,659)	(70)
Gross increases related to current period tax positions	10,244	8,494	9,224
Decreases relating to settlements with tax authorities	0	(50)	(300)
Reductions due to lapses of statute of limitations	(13,435)	(1,014)	(797)
Balance, end of period	$ 86,597	$ 86,877	$ 79,167

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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-Topic 740
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-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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