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INVESTMENTS - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Cost	$ 76,245	$ 70,314
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(242)	(1,413)
Fair Market Value	76,004	68,901
Short-Term | U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Cost	40,329	6,016
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(76)	(134)
Fair Market Value	40,254	5,882
Short-Term | Foreign Government and Agency Securities
Debt Securities, Available-for-sale [Line Items]
Cost		2,865
Gross Unrealized Gains		0
Gross Unrealized Losses		(38)
Fair Market Value		2,827
Short-Term | Commercial Paper
Debt Securities, Available-for-sale [Line Items]
Cost		18,245
Gross Unrealized Gains		0
Gross Unrealized Losses		(223)
Fair Market Value		18,022
Short-Term | Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost	34,545	32,065
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(99)	(528)
Fair Market Value	34,446	31,537
Long-Term | U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Cost	1,371	3,431
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(67)	(210)
Fair Market Value	$ 1,304	3,221
Long-Term | Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost		7,692
Gross Unrealized Gains		0
Gross Unrealized Losses		(280)
Fair Market Value		$ 7,412

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