INVESTMENTS - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Cost	$ 48,141	$ 76,245
Gross Unrealized Gains	161	1
Gross Unrealized Losses	(8)	(242)
Fair Market Value	48,294	76,004
Short-Term | U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Cost	3,841	40,329
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(6)	(76)
Fair Market Value	3,836	40,254
Short-Term | Commercial Paper
Debt Securities, Available-for-sale [Line Items]
Cost	15,964
Gross Unrealized Gains	20
Gross Unrealized Losses	0
Fair Market Value	15,984
Short-Term | Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost	17,008	34,545
Gross Unrealized Gains	56	0
Gross Unrealized Losses	0	(99)
Fair Market Value	17,064	34,446
Long-Term | U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Cost		1,371
Gross Unrealized Gains		0
Gross Unrealized Losses		(67)
Fair Market Value		$ 1,304
Long-Term | Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost	11,328
Gross Unrealized Gains	84
Gross Unrealized Losses	(2)
Fair Market Value	$ 11,410