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v3.26.1

Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 537,712 | $ 450,739
Short-term investments | 7,177 | 24,788
Liabilities: |  |
Deferred compensation | 14,831 | 13,707
Contingent future payments related to the acquisition of Remsdaq | 2,574 | 2,344
Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 15,050 | 13,931
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 537,712 | 450,739
Short-term investments | 7,177 | 24,788
Liabilities: |  |
Deferred compensation | 0 | 0
Contingent future payments related to the acquisition of Remsdaq | 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 | 14,831 | 13,707
Contingent future payments related to the acquisition of Remsdaq | 0 | 0
Significant Other Observable Inputs (Level 2) | Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | 15,050 | 13,931
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Liabilities: |  |
Deferred compensation | 0 | 0
Contingent future payments related to the acquisition of Remsdaq | 2,574 | 2,344
Significant Unobservable Inputs (Level 3) | Rabbi trust assets |  |
Assets: |  |
Rabbi trust assets | $ 0 | $ 0

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