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Investments - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 197,165	$ 41,890
Gross Unrealized Gains	12	111
Gross Unrealized Losses	(69)	(3)
Fair Market Value	197,108	41,998
U.S. Treasury | Short-term
Debt Securities, Available-for-sale [Line Items]
Cost	4,222	10,245
Gross Unrealized Gains	1	38
Gross Unrealized Losses	0	0
Fair Market Value	4,223	10,283
U.S. Treasury | Long-term
Debt Securities, Available-for-sale [Line Items]
Cost	6,996
Gross Unrealized Gains	1
Gross Unrealized Losses	(2)
Fair Market Value	6,995
Asset-backed securities | Short-term
Debt Securities, Available-for-sale [Line Items]
Cost	4,812	4,723
Gross Unrealized Gains	1	36
Gross Unrealized Losses	(2)	0
Fair Market Value	4,811	4,759
Corporate debt securities | Short-term
Debt Securities, Available-for-sale [Line Items]
Cost	140,042	24,956
Gross Unrealized Gains	6	37
Gross Unrealized Losses	(25)	0
Fair Market Value	140,023	24,993
Corporate debt securities | Long-term
Debt Securities, Available-for-sale [Line Items]
Cost	38,184	1,966
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(39)	(3)
Fair Market Value	38,148	$ 1,963
Foreign government and agency securities | Long-term
Debt Securities, Available-for-sale [Line Items]
Cost	2,909
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Market Value	$ 2,908

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