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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2025
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 subject to the disclosure requirements at March 31, 2025 and September 30, 2024, were as follows (in thousands):
|  |  |  |  |  | Gross Unrealized |  |  |  | Classification on Balance Sheet
March 31, 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 |  | $ | 624,080 |  |  | $ | — |  |  | $ | — |  |  | $ | 624,080 |  |  | $ | 624,080 |  |  | $ | — |  |  | $ | — |
Total debt investments |  |  |  | $ | 624,080 |  |  | $ | — |  |  | $ | — |  |  | $ | 624,080 |  |  | $ | 624,080 |  |  | $ | — |  |  | $ | — |
Changes in fair value recorded in other net income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | * |  |  |  |  |  |  |  | $ | 12,534 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,534 |
Total equity investments |  |  |  |  |  |  |  |  |  | 12,534 |  |  | — |  |  | — |  |  | 12,534 |
Total investments |  |  |  |  |  |  |  |  |  | $ | 636,614 |  |  | $ | 624,080 |  |  | $ | — |  |  | $ | 12,534 |
* 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, 2024 |  | 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 |  | $ | 437,273 |  |  | $ | — |  |  | $ | — |  |  | $ | 437,273 |  |  | $ | 437,273 |  |  | $ | — |  |  | $ | — |
Total debt investments |  |  |  | $ | 437,273 |  |  | $ | — |  |  | $ | — |  |  | $ | 437,273 |  |  | $ | 437,273 |  |  | $ | — |  |  | $ | — |
Changes in fair value recorded in other net income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | ** |  |  |  |  |  |  |  | $ | 8,580 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,580 |
Total equity investments |  |  |  |  |  |  |  |  |  | 8,580 |  |  | — |  |  | — |  |  | 8,580 |
Total investments |  |  |  |  |  |  |  |  |  | $ | 445,853 |  |  | $ | 437,273 |  |  | $ | — |  |  | $ | 8,580 |
** The fair value of this equity investment is measured at NAV which approximates fair value and is 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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