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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2022
Fair Value Disclosures [Abstract] |
Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents 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, 2022
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
U.S. government bonds | $ | 1,973 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,973 |
Commercial notes | — |  |  | 41,727 |  |  | — |  |  | 41,727 |
Corporate debt securities | — |  |  | 271,333 |  |  | — |  | 271,333 |
Certificate of deposits | 50,000 |  |  | — |  |  | — |  |  | 50,000 |
Money market instruments | 39,262 |  |  | — |  |  | — |  |  | 39,262 |
| September 30, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Corporate debt securities | $ | — |  |  | $ | 254,073 |  |  | $ | — |  |  | $ | 254,073 |
Certificate of deposits | 50,000 |  |  | — |  |  | — |  |  | 50,000 |
Money market instruments | 160,032 |  |  | — |  |  | — |  |  | 160,032 |
Marketable debt securities | 126,728 |  |  | — |  |  | — |  |  | 126,728 |

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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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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