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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis, and indicate the fair value hierarchy of the valuation techniques utilized by the Company:
| September 30, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Available-for-sale securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | — |  |  | $ | 150,695 |  |  | $ | — |  |  | $ | 150,695 |
Certificate of deposits | — |  |  | 12,019 |  |  | — |  |  | 12,019 |
Municipal securities | — |  |  | 7,046 |  |  | — |  |  | 7,046 |
Commercial notes | — |  |  | 13,801 |  |  | — |  |  | 13,801 |
Corporate debt securities | — |  |  | 509,257 |  |  | — |  |  | 509,257 |
Total available-for-sale securities | — |  |  | 692,818 |  |  | — |  |  | 692,818 |
Cash equivalents |  |  |  |  |  |  |
Money market instruments | 64,460 |  |  | — |  |  | — |  |  | 64,460 |
Term deposit | — |  |  | 134,357 |  |  | — |  |  | 134,357 |
Certificate of deposits | — |  |  | 3,001 |  |  | — |  |  | 3,001 |
Corporate debt securities | — |  |  | 16,182 |  |  | — |  |  | 16,182 |
Total cash equivalents | 64,460 |  |  | 153,540 |  |  | — |  |  | 218,000 |
Total financial assets | $ | 64,460 |  |  | $ | 846,358 |  |  | $ | — |  |  | $ | 910,818 |
| September 30, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Available-for-sale securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | — |  |  | $ | 160,723 |  |  | $ | — |  |  | $ | 160,723 |
Commercial notes | — |  |  | 179,714 |  |  | — |  |  | 179,714 |
Corporate debt securities | — |  |  | 237,839 |  |  | — |  |  | 237,839 |
Total available-for-sale securities | — |  |  | 578,276 |  |  | — |  |  | 578,276 |
Cash equivalents |  |  |  |  |  |  |
Money market instruments | 66,966 |  |  | — |  |  | — |  |  | 66,966 |
Total cash equivalents | 66,966 |  |  | — |  |  | — |  |  | 66,966 |
Total financial assets | $ | 66,966 |  |  | $ | 578,276 |  |  | $ | — |  |  | $ | 645,242 |

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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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