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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 315,331 | $ 245,875
Short-term investments | 43,061 | 33,134
Liabilities: |  |
Deferred compensation | 12,027 | 9,145
Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 12,324 | 9,117
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 315,331 | 245,875
Short-term investments | 43,061 | 33,134
Liabilities: |  |
Deferred compensation | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Liabilities: |  |
Deferred compensation | 12,027 | 9,145
Significant Other Observable Inputs (Level 2) | Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 12,324 | 9,117
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Liabilities: |  |
Deferred compensation | 0 | 0
Significant Unobservable Inputs (Level 3) | Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | $ 0 | $ 0

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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