Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Feb. 28, 2023	Feb. 28, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 865,943	$ 701,865
Mutual fund investments	22,671	24,022
Total assets at fair value	$ 1,019,812	$ 774,678
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	3.90%	2.90%
Total liabilities at fair value	$ 0	$ (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 instruments designated as hedges	$ 97,328	$ 39,452
Derivative instruments designated as hedges		(1,379)
Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as hedges	33,870	9,339
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	865,943	701,865
Mutual fund investments	22,671	24,022
Total assets at fair value	$ 888,614	$ 725,887
Percent of total assets at fair value	87.10%	93.70%
Percent of total assets	3.40%	2.80%
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
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	$ 131,198	$ 48,791
Percent of total assets at fair value	12.90%	6.30%
Percent of total assets	0.50%	0.20%
Total liabilities at fair value	$ 0	$ (1,379)
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	$ 97,328	$ 39,452
Derivative instruments designated as hedges		(1,379)
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	$ 33,870	$ 9,339