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Fair Value - Narrative (Details) - U.S. Treasury Bills - USD ($) $ in Millions	3 Months Ended
	May 31, 2024	Feb. 29, 2024
Fair Value
Unrealized loss on US Treasury bills	$ 0.1
Minimum
Fair Value
Term of US treasury bills held to maturity (less than one to five years)	1 year
Maximum
Fair Value
Term of US treasury bills held to maturity (less than one to five years)	5 years
Prepaid Expenses and Other Current Assets
Fair Value
US treasury bills, carrying value, current	$ 2.5	$ 2.5
Other Assets
Fair Value
US treasury bills, carrying value, non-current	$ 6.6	$ 6.6

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

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