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Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets Measured at Fair Value on a Recurring Basis | The Company's financial assets measured at fair value on a recurring basis at June 30, 2026 and September 30, 2025, were as follows (in thousands):
|  |  |  |  |  | Gross Unrealized |  |  |  | Classification on Balance Sheet
June 30, 2026 |  | Fair Value Level |  | Cost or Amortized Cost |  | Gains |  | Losses |  | Aggregate Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Changes in fair value recorded in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | Level 1 |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |  |  | $ | 828,013 |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |
Total cash equivalents |  |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |  |  | $ | 828,013 |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | — |
Changes in fair value recorded in other net income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | * |  |  |  |  |  |  |  | $ | 21,991 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,991 |
Total equity investments |  |  |  |  |  |  |  |  |  | 21,991 |  |  | — |  |  | — |  |  | 21,991 |
Total |  |  |  |  |  |  |  |  |  | $ | 850,004 |  |  | $ | 828,013 |  |  | $ | — |  |  | $ | 21,991 |
* Equity investments presented in the table above include investments without readily determinable fair values that are measured at fair value using net asset value ("NAV") as a practical expedient, or are measured at cost with adjustments for observable changes in price or impairments. The equity investments are not classified within the fair value hierarchy.
|  |  |  |  |  | Gross Unrealized |  |  |  | Classification on Balance Sheet
September 30, 2025 |  | Fair Value Level |  | Cost or Amortized Cost |  | Gains |  | Losses |  | Aggregate Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Changes in fair value recorded in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | Level 1 |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |  |  | $ | 642,997 |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |
Total cash equivalents |  |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |  |  | $ | 642,997 |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | — |
Changes in fair value recorded in other net income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | * |  |  |  |  |  |  |  | $ | 15,693 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,693 |
Total equity investments |  |  |  |  |  |  |  |  |  | 15,693 |  |  | — |  |  | — |  |  | 15,693 |
Total |  |  |  |  |  |  |  |  |  | $ | 658,690 |  |  | $ | 642,997 |  |  | $ | — |  |  | $ | 15,693 |
* Equity investments presented in the table above include investments without readily determinable fair values that are measured at fair value using NAV as a practical expedient, or are measured at cost with adjustments for observable changes in price or impairments. The equity investments are not classified within the fair value hierarchy.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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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