Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Nov. 30, 2021	Feb. 28, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 705,326	$ 685,585
Mutual fund investments	25,650	24,049
Total assets at fair value	$ 745,213	$ 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	$ (4,561)	$ (6,024)
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	$ 705,326	$ 685,585
Mutual fund investments	25,650	24,049
Total assets at fair value	$ 730,976	$ 709,634
Percent of total assets at fair value	98.10%	99.40%
Percent of total assets	2.90%	3.30%
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	$ 14,237	$ 4,562
Percent of total assets at fair value	1.90%	0.60%
Percent of total assets	0.10%	0.00%
Total liabilities at fair value	$ (4,561)	$ (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 Asset	$ 10,566	$ 4,061
Liabilities: Derivative instruments	(4,561)	(6,024)
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	10,566	4,061
Liabilities: Derivative instruments	(4,561)	(6,024)
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	3,671	501
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	$ 3,671	$ 501