Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Feb. 28, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 722,607	$ 685,585
Mutual fund investments	25,428	24,049
Equity Method Investments, Fair Value Disclosure	24,177
Total assets at fair value	$ 772,589	$ 714,196
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	3.20%	3.30%
Total liabilities at fair value	$ (6,695)	$ (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	$ 722,607	$ 685,585
Mutual fund investments	25,428	24,049
Equity Method Investments, Fair Value Disclosure	24,177
Total assets at fair value	$ 772,212	$ 709,634
Percent of total assets at fair value	100.00%	99.40%
Percent of total assets	3.20%	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
Equity Method Investments, Fair Value Disclosure	0
Total assets at fair value	$ 377	$ 4,562
Percent of total assets at fair value	0.00%	0.60%
Percent of total assets	0.00%	0.00%
Total liabilities at fair value	$ (6,695)	$ (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		$ 4,061
Liabilities: Derivative instruments	$ (6,593)	(6,024)
Designated As Hedging Instrument | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		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		4,061
Liabilities: Derivative instruments	(6,593)	(6,024)
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	377	501
Liabilities: Derivative instruments	(102)
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
Liabilities: Derivative instruments	0
Not Designated as Hedging Instrument [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	377	$ 501
Liabilities: Derivative instruments	$ (102)