Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Feb. 28, 2022	Feb. 28, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 701,865	$ 685,585
Mutual fund investments	24,022	24,049
Total assets at fair value	$ 774,678	$ 714,196
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	2.90%	3.30%
Total liabilities at fair value	$ (1,379)	$ (6,024)
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 instruments designated as hedges	$ 39,452	$ 4,061
Derivative instruments designated as hedges	(1,379)	(6,024)
Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as hedges	9,339	501
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	701,865	685,585
Mutual fund investments	24,022	24,049
Total assets at fair value	$ 725,887	$ 709,634
Percent of total assets at fair value	93.70%	99.40%
Percent of total assets	2.80%	3.30%
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 instruments designated as hedges	$ 0	$ 0
Derivative instruments designated as hedges	0	0
Level 1 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as hedges	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	$ 48,791	$ 4,562
Percent of total assets at fair value	6.30%	0.60%
Percent of total assets	0.20%	0.00%
Total liabilities at fair value	$ (1,379)	$ (6,024)
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 instruments designated as hedges	$ 39,452	$ 4,061
Derivative instruments designated as hedges	(1,379)	(6,024)
Level 2 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as hedges	$ 9,339	$ 501