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INVESTMENTS - Investments by Type of Security (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 48,980 | $ 76,245
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (105) | (242)
Fair Market Value | 48,875 | 76,004
Short-Term | U.S. Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 3,814 | 40,329
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (24) | (76)
Fair Market Value | 3,790 | 40,254
Short-Term | U.S. Government and agency securities, short-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 6,722 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (4) |
Fair Market Value | 6,718 |
Short-Term | Commercial paper, short-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 15,723 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (12) |
Fair Market Value | 15,711 |
Short-Term | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 12,538 | 34,545
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (39) | (99)
Fair Market Value | 12,499 | 34,446
Long-Term | U.S. Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 0 | 1,371
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (67)
Fair Market Value | 0 | $ 1,304
Long-Term | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 10,183 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (26) |
Fair Market Value | 10,157 |
Long-Term | Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 0 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Market Value | $ 0 |

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