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Fair Value Measurements (Tables)
 3 Months Ended
May 31, 2018
Fair Value Disclosures [Abstract]  
Schedule Of Items Measured At Fair Value On A Recurring Basis
Items Measured at Fair Value on a Recurring Basis
 
As of May 31, 2018
(In thousands)
Level 1
 
Level 2
 
Total
Assets:
 
 
 
 
 
Money market securities
$
310,192

 
$
—

 
$
310,192

Mutual fund investments
20,145

 
—

 
20,145

Derivative instruments
—

 
4,629

 
4,629

Total assets at fair value
$
330,337

 
$
4,629

 
$
334,966

 
 
 
 
 
 
Percent of total assets at fair value
98.6
%
 
1.4
 %
 
100.0
 %
Percent of total assets
1.9
%
 
—
 %
 
1.9
 %
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
Derivative instruments
$
—

 
$
(1,430
)
 
$
(1,430
)
Total liabilities at fair value
$
—

 
$
(1,430
)
 
$
(1,430
)
 
 
 
 
 
 
Percent of total liabilities
—
%
 
—
 %
 
—
 %
 
As of February 28, 2018
(In thousands)
Level 1
 
Level 2
 
Total
Assets:
 
 
 
 
 
Money market securities
$
276,894

 
$
—

 
$
276,894

Mutual fund investments
19,429

 
—

 
19,429

Derivative instruments
—

 
12,127

 
12,127

Total assets at fair value
$
296,323

 
$
12,127

 
$
308,450

 
 
 
 
 
 
Percent of total assets at fair value
96.1
%
 
3.9
%
 
100.0
%
Percent of total assets
1.7
%
 
0.1
%
 
1.8
%
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
Derivative instruments
$
—

 
$
(99
)
 
$
(99
)
Total liabilities at fair value
$
—

 
$
(99
)
 
$
(99
)
 
 
 
 
 
 
Percent of total liabilities
—
%
 
—
%
 
—
%
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
(In thousands)
As of May 31, 2018
 
As of February 28, 2018
Carrying value
$
500,000

 
$
500,000

Fair value
$
486,083

 
$
492,163