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Fair Value - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2024 | Feb. 29, 2024 | Feb. 28, 2023
Fair Value |  |  |
Asset impairment charges |  | $ 0 | $ 0
US Treasury Bills |  |  |
Fair Value |  |  |
Debt securities, held-to-maturity, fair value, current | $ 2,500,000 | 2,500,000 |
Debt securities, held-to-maturity, fair value, noncurrent | 6,600,000 | $ 6,600,000 |
Interest income, debt securities, held-to-maturity | $ 300,000 |  |
US Treasury Bills | Minimum |  |  |
Fair Value |  |  |
Debt securities, held to maturity, term of securities | 1 year | 1 year |
US Treasury Bills | Maximum |  |  |
Fair Value |  |  |
Debt securities, held to maturity, term of securities | 5 years | 5 years |

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