Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Aug. 31, 2023	Feb. 28, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market securities	$ 1,154,122	$ 865,943
Mutual fund investments	25,558	22,671
Total assets at fair value	$ 1,286,961	$ 1,019,812
Percent of total assets at fair value	100.00%	100.00%
Percent of total assets	4.70%	3.90%
Total liabilities at fair value	$ (401)	$ 0
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	$ 1,154,122	$ 865,943
Mutual fund investments	25,558	22,671
Total assets at fair value	$ 1,179,680	$ 888,614
Percent of total assets at fair value	91.70%	87.10%
Percent of total assets	4.30%	3.40%
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	$ 107,281	$ 131,198
Percent of total assets at fair value	8.30%	12.90%
Percent of total assets	0.40%	0.50%
Total liabilities at fair value	$ (401)	$ 0
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	$ 83,914	$ 97,328
Liabilities: Derivative instruments	(401)
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
Designated As Hedging Instrument | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	83,914	97,328
Liabilities: Derivative instruments	(401)
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	23,367	33,870
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	$ 23,367	$ 33,870