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Fair Value - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2024 | Nov. 30, 2023 | Nov. 30, 2024 | Nov. 30, 2023 | Feb. 29, 2024
Fair Value |  |  |  |  |
Investment income, interest | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.1 |
U.S. Treasury Bills |  |  |  |  |
Fair Value |  |  |  |  |
Gross unrealized gains (losses) on US Treasury bills |  |  | $ 0.0 |  | $ 0.0
U.S. Treasury Bills | Minimum |  |  |  |  |
Fair Value |  |  |  |  |
Term of US treasury bills held to maturity (less than one to five years) | 1 year |  | 1 year |  |
U.S. Treasury Bills | Maximum |  |  |  |  |
Fair Value |  |  |  |  |
Term of US treasury bills held to maturity (less than one to five years) | 5 years |  | 5 years |  |
U.S. Treasury Bills | Prepaid Expenses and Other Current Assets |  |  |  |  |
Fair Value |  |  |  |  |
US treasury bills, carrying value, current | $ 2.5 |  | $ 2.5 |  | 2.5
U.S. Treasury Bills | Other Assets |  |  |  |  |
Fair Value |  |  |  |  |
US treasury bills, carrying value, current | 2.5 |  | 2.5 |  | 2.5
US treasury bills, carrying value, non-current | $ 8.2 |  | $ 8.2 |  | $ 6.6

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