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INVESTMENTS - Investments by Type of Security (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Cost	$ 47,251	$ 48,141
Gross Unrealized Gains	56	161
Gross Unrealized Losses	(49)	(8)
Fair Market Value	47,258	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	969
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Market Value	970
Short-Term | Commercial paper, short-term
Debt Securities, Available-for-sale [Line Items]
Cost	9,304	15,964
Gross Unrealized Gains	7	20
Gross Unrealized Losses	(2)	0
Fair Market Value	9,309	15,984
Short-Term | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	20,290	17,008
Gross Unrealized Gains	28	56
Gross Unrealized Losses	(6)	0
Fair Market Value	20,312	17,064
Long Term Investments | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	15,188	11,328
Gross Unrealized Gains	20	84
Gross Unrealized Losses	(39)	(2)
Fair Market Value	15,169	$ 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	(2)
Fair Market Value	$ 1,498

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