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Investments & Fair Value Measurements - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 94,300 | $ 240,170
Less Than 12 Months, Gross Unrealized Losses | (763) | (4,895)
12 Months or Greater, Fair Value | 80,149 | 31,603
12 Months or Greater, Gross Unrealized Loss | (2,517) | (1,104)
Certificate of deposit |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 9,882 | 10,352
Less Than 12 Months, Gross Unrealized Losses | (41) | (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 | 880 | 13,144
Less Than 12 Months, Gross Unrealized Losses | (15) | (5)
12 Months or Greater, Fair Value | 539 | 1,395
12 Months or Greater, Gross Unrealized Loss | (16) | (55)
Government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 13,629 | 89,741
Less Than 12 Months, Gross Unrealized Losses | (108) | (2,593)
12 Months or Greater, Fair Value | 49,976 | 8,566
12 Months or Greater, Gross Unrealized Loss | (1,598) | (332)
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 4,321 | 5,770
Less Than 12 Months, Gross Unrealized Losses | (13) | (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 | 40,955 | 81,044
Less Than 12 Months, Gross Unrealized Losses | (413) | (1,523)
12 Months or Greater, Fair Value | 19,591 | 18,306
12 Months or Greater, Gross Unrealized Loss | (683) | (561)
Municipal debt securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 24,633 | 40,119
Less Than 12 Months, Gross Unrealized Losses | (173) | (712)
12 Months or Greater, Fair Value | 10,043 | 3,336
12 Months or Greater, Gross Unrealized Loss | $ (220) | $ (156)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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