Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	May 31, 2022	Feb. 28, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 687,599	$ 701,865
Mutual fund investments	24,593	24,022
Total assets at fair value	$ 800,953	$ 774,678
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	3.00%	2.90%
Total liabilities at fair value	$ (1,518)	$ (1,379)
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	$ 687,599	$ 701,865
Mutual fund investments	24,593	24,022
Total assets at fair value	$ 712,192	$ 725,887
Percent of total assets at fair value	88.90%	93.70%
Percent of total assets	2.70%	2.80%
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
Total assets at fair value	$ 88,761	$ 48,791
Percent of total assets at fair value	11.10%	6.30%
Percent of total assets	0.30%	0.20%
Total liabilities at fair value	$ (1,518)	$ (1,379)
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 Asset	$ 70,215	$ 39,452
Liabilities: Derivative instruments	(1,518)	(1,379)
Designated As Hedging Instrument | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Liabilities: Derivative instruments	0	0
Designated As Hedging Instrument | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	70,215	39,452
Liabilities: Derivative instruments	(1,518)	(1,379)
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	18,546	9,339
Not Designated as Hedging Instrument [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0
Not Designated as Hedging Instrument [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 18,546	$ 9,339