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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2026	Sep. 30, 2025
Financial assets:
Cash equivalents	[1]	$ 268,635	$ 38,031
Financial assets, fair value		276,252	50,266
Financial liabilities:
Financial liabilities, fair value		5,274	4,773
Forward Contracts
Financial assets:
Foreign currency contract, asset		735	6,007
Financial liabilities:
Foreign currency contracts, liability		5,274	4,773
Option contracts
Financial assets:
Foreign currency contract, asset		6,882	6,228
Level 1
Financial assets:
Cash equivalents	[1]	268,635	38,031
Financial assets, fair value		268,635	38,031
Financial liabilities:
Financial liabilities, fair value		0	0
Level 1 | Forward Contracts
Financial assets:
Foreign currency contract, asset		0	0
Financial liabilities:
Foreign currency contracts, liability		0	0
Level 1 | Option contracts
Financial assets:
Foreign currency contract, asset		0	0
Level 2
Financial assets:
Cash equivalents	[1]	0	0
Financial assets, fair value		7,617	12,235
Financial liabilities:
Financial liabilities, fair value		5,274	4,773
Level 2 | Forward Contracts
Financial assets:
Foreign currency contract, asset		735	6,007
Financial liabilities:
Foreign currency contracts, liability		5,274	4,773
Level 2 | Option contracts
Financial assets:
Foreign currency contract, asset		6,882	6,228
Level 3
Financial assets:
Cash equivalents	[1]	0	0
Financial assets, fair value		0	0
Financial liabilities:
Financial liabilities, fair value		0	0
Level 3 | Forward Contracts
Financial assets:
Foreign currency contract, asset		0	0
Financial liabilities:
Foreign currency contracts, liability		0	0
Level 3 | Option contracts
Financial assets:
Foreign currency contract, asset		$ 0	$ 0
[1] Money market funds and time deposits.

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Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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