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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 323,256 | $ 245,875
Short-term investments | 42,083 | 33,134
Liabilities: |  |
Deferred compensation | 11,195 | 9,145
Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 11,549 | 9,117
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 323,256 | 245,875
Short-term investments | 42,083 | 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 | 11,195 | 9,145
Significant Other Observable Inputs (Level 2) | Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 11,549 | 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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