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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
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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%

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