Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Feb. 28, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 273,203	$ 372,448
Mutual fund investments	22,668	19,263
Derivative instruments	0	1,844
Total assets at fair value	$ 295,871	$ 393,555
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	1.40%	2.10%
Derivative instruments	$ (23,992)	$ (6,120)
Total liabilities at fair value	$ (23,992)	$ (6,120)
Percent of total liabilities	0.10%	0.00%
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 273,203	$ 372,448
Mutual fund investments	22,668	19,263
Derivative instruments	0	0
Total assets at fair value	$ 295,871	$ 391,711
Percent of total assets at fair value	100.00%	99.50%
Percent of total assets	1.40%	2.10%
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	0	1,844
Total assets at fair value	$ 0	$ 1,844
Percent of total assets at fair value	0.00%	0.50%
Percent of total assets	0.00%	0.00%
Derivative instruments	$ (23,992)	$ (6,120)
Total liabilities at fair value	$ (23,992)	$ (6,120)
Percent of total liabilities	0.10%	0.00%