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INVESTMENTS - Investments by Type of Security (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Cost	$ 47,640	$ 48,141
Gross Unrealized Gains	65	161
Gross Unrealized Losses	(22)	(8)
Fair Market Value	47,683	48,294
Short-Term | U.S. Treasury, short-term
Debt Securities, Available-for-sale [Line Items]
Cost		3,841
Gross Unrealized Gains		1
Gross Unrealized Losses		(6)
Fair Market Value		3,836
Short-Term | U.S. Government and agency securities, short-term
Debt Securities, Available-for-sale [Line Items]
Cost	978
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Market Value	979
Short-Term | Commercial paper, short-term
Debt Securities, Available-for-sale [Line Items]
Cost	10,129	15,964
Gross Unrealized Gains	2	20
Gross Unrealized Losses	(1)	0
Fair Market Value	10,130	15,984
Short-Term | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	20,339	17,008
Gross Unrealized Gains	29	56
Gross Unrealized Losses	(5)	0
Fair Market Value	20,363	17,064
Long Term Investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	14,694	11,328
Gross Unrealized Gains	33	84
Gross Unrealized Losses	(15)	(2)
Fair Market Value	14,712	$ 11,410
Long Term Investments | U.S. Government and agency securities, long-term
Debt Securities, Available-for-sale [Line Items]
Cost	1,500
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Market Value	$ 1,499

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