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Investments & Fair Value Measurements - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
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 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 more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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+ References

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