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Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
May 31, 2018
Feb. 28, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market securities $ 310,192 $ 276,894
Mutual fund investments 20,145 19,429
Derivative instruments 4,629 12,127
Total assets at fair value $ 334,966 $ 308,450
Percent of total assets at fair value 100.00% 100.00%
Percent of total assets 1.90% 1.80%
Liabilities: Derivative instruments $ (1,430) $ (99)
Total liabilities at fair value $ (1,430) $ (99)
Percent of total liabilities 0.00% 0.00%
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market securities $ 310,192 $ 276,894
Mutual fund investments 20,145 19,429
Derivative instruments 0 0
Total assets at fair value $ 330,337 $ 296,323
Percent of total assets at fair value 98.60% 96.10%
Percent of total assets 1.90% 1.70%
Liabilities: Derivative instruments $ 0 $ 0
Total liabilities at fair value $ 0 $ 0
Percent of total liabilities 0.00% 0.00%
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
Derivative instruments 4,629 12,127
Total assets at fair value $ 4,629 $ 12,127
Percent of total assets at fair value 1.40% 3.90%
Percent of total assets 0.00% 0.10%
Liabilities: Derivative instruments $ (1,430) $ (99)
Total liabilities at fair value $ (1,430) $ (99)
Percent of total liabilities 0.00% 0.00%