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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