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Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
Feb. 29, 2024
Feb. 28, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market securities $ 1,164,270 $ 865,943
Mutual fund investments 24,312 22,671
Total assets at fair value $ 1,247,407 $ 1,019,812
Percent of total assets at fair value 100.00% 100.00%
Percent of total assets 4.60% 3.90%
Total liabilities at fair value $ (2,302) $ 0
Percent of total liabilities 0.00% 0.00%
Designated As Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset $ 45,761 $ 97,328
Derivative Liability (2,302)  
Not Designated as Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 13,064 33,870
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market securities 1,164,270 865,943
Mutual fund investments 24,312 22,671
Total assets at fair value $ 1,188,582 $ 888,614
Percent of total assets at fair value 95.30% 87.10%
Percent of total assets 4.40% 3.40%
Total liabilities at fair value $ 0 $ 0
Percent of total liabilities 0.00% 0.00%
Level 1 | Designated As Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset $ 0 $ 0
Derivative Liability 0  
Level 1 | Not Designated as Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market securities 0 0
Mutual fund investments 0 0
Total assets at fair value $ 58,825 $ 131,198
Percent of total assets at fair value 4.70% 12.90%
Percent of total assets 0.20% 0.50%
Total liabilities at fair value $ (2,302) $ 0
Percent of total liabilities 0.00% 0.00%
Level 2 | Designated As Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset $ 45,761 $ 97,328
Derivative Liability (2,302)  
Level 2 | Not Designated as Hedging Instrument    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset $ 13,064 $ 33,870