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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis | The following table summarizes the fair value of our assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2026 (in thousands):
| Fair Value Measurements at March 31, 2026
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Fair Value at March 31, 2026
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 537,712 |  |  | $ | — |  |  | $ | — |  |  | $ | 537,712 |
Short-term investments | 7,177 |  |  | — |  |  | — |  |  | 7,177 |
Rabbi trust assets | — |  |  | 15,050 |  |  | — |  |  | 15,050 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation | — |  |  | 14,831 |  |  | — |  |  | 14,831 |
Contingent future payments related to the acquisition of Remsdaq | — |  |  | — |  |  | 2,574 |  |  | 2,574 |
The following table summarizes the fair value of our assets and liabilities that were accounted for at fair value on a recurring basis as of September 30, 2025 (in thousands):
| Fair Value Measurements at September 30, 2025
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Fair Value at September 30, 2025
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 450,739 |  |  | $ | — |  |  | $ | — |  |  | $ | 450,739 |
Short-term investments | 24,788 |  |  | — |  |  | — |  |  | 24,788 |
Rabbi trust assets | — |  |  | 13,931 |  |  | — |  |  | 13,931 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation | — |  |  | 13,707 |  |  | — |  |  | 13,707 |
Contingent future payments related to the acquisition of Remsdaq | — |  |  | — |  |  | 2,344 |  |  | 2,344 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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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