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Summary of Significant Accounting Policies - Schedule of Supplemental Disclosures of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Cash paid (received) during the period for:
Interest received, net of interest expense	$ (14,542)	$ (15,641)	$ (5,465)
Income taxes paid, net of refunds	56,133	50,919	17,232
Non-cash capital expenditures	$ 186	$ 361	$ 183

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Interest Paid, Net Of Interest Income

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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