Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	May 31, 2020	Feb. 29, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 697,363	$ 273,203
Mutual fund investments	22,330	22,668
Total assets at fair value	$ 719,693	$ 295,871
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	3.60%	1.40%
Total liabilities at fair value	$ (27,611)	$ (23,992)
Percent of total liabilities	0.20%	0.10%
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 697,363	$ 273,203
Mutual fund investments	22,330	22,668
Total assets at fair value	$ 719,693	$ 295,871
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	3.60%	1.40%
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	$ 0	$ 0
Percent of total assets at fair value	0.00%	0.00%
Percent of total assets	0.00%	0.00%
Total liabilities at fair value	$ (27,611)	$ (23,992)
Percent of total liabilities	0.20%	0.10%
Designated As Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities: Derivative instruments	$ (25,719)	$ (23,992)
Designated As Hedging Instrument | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities: Derivative instruments	0	0
Designated As Hedging Instrument | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities: Derivative instruments	(25,719)	$ (23,992)
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities: Derivative instruments	(1,892)
Not Designated as Hedging Instrument [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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]
Liabilities: Derivative instruments	$ (1,892)