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Investments & Fair Value Measurements - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 128,417 | $ 240,170
Less Than 12 Months, Gross Unrealized Losses | (1,150) | (4,895)
12 Months or Greater, Fair Value | 56,879 | 31,603
12 Months or Greater, Gross Unrealized Loss | (2,134) | (1,104)
Certificate of deposit |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 9,916 | 10,352
Less Than 12 Months, Gross Unrealized Losses | (12) | (47)
12 Months or Greater, Fair Value | 0 | 0
12 Months or Greater, Gross Unrealized Loss | 0 | 0
U.S. agency securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 842 | 13,144
Less Than 12 Months, Gross Unrealized Losses | (18) | (5)
12 Months or Greater, Fair Value | 0 | 1,395
12 Months or Greater, Gross Unrealized Loss | 0 | (55)
Government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 33,190 | 89,741
Less Than 12 Months, Gross Unrealized Losses | (332) | (2,593)
12 Months or Greater, Fair Value | 38,862 | 8,566
12 Months or Greater, Gross Unrealized Loss | (1,443) | (332)
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 5,576 | 5,770
Less Than 12 Months, Gross Unrealized Losses | (4) | (15)
12 Months or Greater, Fair Value | 0 | 0
12 Months or Greater, Gross Unrealized Loss | 0 | 0
Corporate bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 58,578 | 81,044
Less Than 12 Months, Gross Unrealized Losses | (602) | (1,523)
12 Months or Greater, Fair Value | 9,746 | 18,306
12 Months or Greater, Gross Unrealized Loss | (500) | (561)
Municipal debt securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 20,315 | 40,119
Less Than 12 Months, Gross Unrealized Losses | (182) | (712)
12 Months or Greater, Fair Value | 8,271 | 3,336
12 Months or Greater, Gross Unrealized Loss | $ (191) | $ (156)

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