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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Available-for-sale securities | $ 450,211 | $ 1,263,784
Derivative Asset, Statement of Financial Position | Prepaid expenses and other current assets | Prepaid expenses and other current assets
Fair Value, Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Available-for-sale securities | $ 450,211 | $ 1,263,782
Foreign exchange contracts | 44 | 634
Net investment hedge | 13,036 | 124,789
Total Assets | 989,243 | 1,764,009
Liabilities, Fair Value Disclosure [Abstract] |  |
Foreign exchange contracts | 421 | 230
Total Liabilities | 421 | 230
Fair Value, Recurring | Cash Equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 525,952 | 374,804
Fair Value, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Available-for-sale securities | 85,949 | 651,800
Total Assets | 611,901 | 1,025,855
Fair Value, Recurring | Fair Value, Inputs, Level 1 | Cash Equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 525,952 | 374,055
Fair Value, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Available-for-sale securities | 364,262 | 611,982
Foreign exchange contracts | 44 | 634
Net investment hedge | 13,036 | 124,789
Total Assets | 377,342 | 738,154
Liabilities, Fair Value Disclosure [Abstract] |  |
Foreign exchange contracts | 421 | 230
Total Liabilities | $ 421 | 230
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Cash Equivalents |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents |  | $ 749

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- Definition 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. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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