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Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Feb. 28, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market securities $ 346,842 $ 397,994
Mutual fund investments 18,496 16,519
Derivative instruments 233 2,997
Total assets at fair value $ 365,571 $ 417,510
Percent of total assets at fair value 100.00% 100.00%
Percent of total assets 2.20% 2.60%
Liabilities: Derivative instruments $ (4,388) $ (509)
Total liabilities at fair value $ (4,388) $ (509)
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 $ 346,842 $ 397,994
Mutual fund investments 18,496 16,519
Derivative instruments 0 0
Total assets at fair value $ 365,338 $ 414,513
Percent of total assets at fair value 99.90% 99.30%
Percent of total assets 2.20% 2.50%
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 233 2,997
Total assets at fair value $ 233 $ 2,997
Percent of total assets at fair value 0.10% 0.70%
Percent of total assets 0.00% 0.00%
Liabilities: Derivative instruments $ (4,388) $ (509)
Total liabilities at fair value $ (4,388) $ (509)
Percent of total liabilities 0.00% 0.00%