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Stock-Based Employee Compensation (Tables)
 12 Months Ended
Feb. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Total compensation cost and income tax benefits recognized
Total compensation cost and income tax benefits recognized for the Company’s stock-based awards are as follows:
 
For the Years Ended
 
February 28, 2014
 
February 28, 2013
 
February 29, 2012
(in millions)
 
 
 
 
 
Total compensation cost for stock-based awards recognized in the Consolidated Statements of Comprehensive Income
$
49.9

 
$
40.8

 
$
47.6

Total income tax benefit recognized in the Consolidated Statements of Comprehensive Income for stock-based compensation
$
17.1

 
$
13.8

 
$
16.3

Total compensation cost for stock-based awards capitalized in inventory in the Consolidated Balance Sheets
$
4.2

 
$
4.1

 
$
3.7
Stock option activity
A summary of stock option activity primarily under the Company’s Long-Term Stock Incentive Plan is as follows:
 
Number
of
Options
Outstanding
 
Weighted
Average
Exercise
Price
 
Number
of
Options
Exercisable
 
Weighted
Average
Exercise
Price
Balance, February 28, 2011
29,843,605

 
$
18.63

 
18,148,632

 
$
20.31

Granted
2,745,309

 
$
20.62

 
 
 
 
Exercised
(3,438,706
)
 
$
14.75

 
 
 
 
Forfeited
(550,203
)
 
$
16.91

 
 
 
 
Expired
(1,668,708
)
 
$
24.03

 
 
 
 
Balance, February 29, 2012
26,931,297

 
$
19.03

 
18,198,577

 
$
20.18

Granted
1,980,260

 
$
24.65

 
 
 
 
Exercised
(8,234,324
)
 
$
19.18

 
 
 
 
Forfeited
(207,945
)
 
$
17.81

 
 
 
 
Expired
(205,210
)
 
$
24.11

 
 
 
 
Balance, February 28, 2013
20,264,078

 
$
19.48

 
13,697,345

 
$
19.66

Granted
1,284,500

 
$
48.79

 
 
 
 
Exercised
(6,119,923
)
 
$
19.63

 
 
 
 
Forfeited
(103,497
)
 
$
28.86

 
 
 
 
Expired
(11,084
)
 
$
18.79

 
 
 
 
Balance, February 28, 2014
15,314,074

 
$
21.82

 
10,913,019

 
$
18.91
Restricted stock activity
A summary of restricted Class A Common Stock activity under the Company’s Long-Term Stock Incentive Plan is as follows:
 
Restricted Stock Awards
 
Number of
Restricted
Stock Awards
Outstanding
 
Weighted
Average
Grant-Date
Fair Value
 
Fair
Value of
Shares
Vested
Nonvested balance, February 28, 2011
1,810,316

 
$
14.83

 
 
Granted
622,092

 
$
20.63

 
 
Vested
(529,118
)
 
$
14.87

 
$
11,826,372

Forfeited
(105,402
)
 
$
16.56

 
 
Nonvested balance, February 29, 2012
1,797,888

 
$
16.72

 
 
Granted
18,190

 
$
30.14

 
 
Vested
(626,914
)
 
$
16.26

 
$
13,741,842

Forfeited
(61,140
)
 
$
17.44

 
 
Nonvested balance, February 28, 2013
1,128,024

 
$
17.16

 
 
Granted
12,375

 
$
50.90

 
 
Vested
(697,994
)
 
$
15.90

 
$
34,427,377

Forfeited
(33,661
)
 
$
19.00

 
 
Nonvested balance, February 28, 2014
408,744

 
$
20.18

 
 
 
Restricted Stock Units
 
Number of
Restricted
Stock Units
Outstanding
 
Weighted
Average
Grant-Date
Fair Value
 
Fair
Value of
Shares
Vested
Nonvested balance, February 28, 2011
219,498

 
$
15.23

 
 
Granted
80,970

 
$
20.60

 
 
Vested
(60,928
)
 
$
15.43

 
$
1,364,178

Forfeited
(36,458
)
 
$
16.93

 
 
Nonvested balance, February 29, 2012
203,082

 
$
17.01

 
 
Granted
609,080

 
$
25.08

 
 
Vested
(66,500
)
 
$
16.69

 
$
1,443,700

Forfeited
(24,159
)
 
$
23.31

 
 
Nonvested balance, February 28, 2013
721,503

 
$
23.65

 
 
Granted
656,710

 
$
50.74

 
 
Vested
(218,306
)
 
$
21.30

 
$
10,747,204

Forfeited
(55,327
)
 
$
30.58

 
 
Nonvested balance, February 28, 2014
1,104,580

 
$
39.87

 
 

 
Performance Share Units
 
Number of
Performance
Share Units
Outstanding
 
Weighted
Average
Grant-Date
Fair Value
 
Fair
Value of
Shares
Vested
Nonvested balance, February 28, 2011
404,410

 
$
16.67

 
 
Granted
319,880

 
$
20.60

 
 
Vested
(202,205
)
 
$
16.67

 
$
4,527,370

Forfeited
(33,875
)
 
$
18.93

 
 
Nonvested balance, February 29, 2012
488,210

 
$
19.09

 
 
Granted
256,420

 
$
38.47

 
 
Vested
—

 
$
—

 
$
—

Forfeited
(15,620
)
 
$
21.15

 
 
Nonvested balance, February 28, 2013
729,010

 
$
25.86

 
 
Granted
298,710

 
$
57.88

 
 
Vested
(197,450
)
 
$
16.97

 
$
9,762,648

Forfeited
(31,670
)
 
$
34.98

 
 
Nonvested balance, February 28, 2014
798,600

 
$
39.67

 
 
Stock options outstanding
The following table summarizes information about stock options outstanding at February 28, 2014:
Range of Exercise Prices
 
Number
of
Options
 
Weighted
Average
Remaining
Contractual
Life
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
$11.85 – $16.63
 
2,682,830

 
5.0 years
 
$
11.96

 
 
$16.67 – $20.05
 
4,083,010

 
5.1 years
 
$
17.90

 
 
$20.60 – $23.02
 
3,782,757

 
5.2 years
 
$
20.86

 
 
$23.48 – $26.24
 
2,936,763

 
5.7 years
 
$
24.86

 
 
$27.24 – $53.41
 
1,828,714

 
6.8 years
 
$
42.13

 
 
Options outstanding
 
15,314,074

 
5.4 years
 
$
21.82

 
$
906,746,691

Options exercisable
 
10,913,019

 
4.5 years
 
$
18.91

 
$
677,967,080
Other information, Stock options
Other information pertaining to stock options is as follows:
 
For the Years Ended
 
February 28, 2014
 
February 28, 2013
 
February 29, 2012
Weighted average grant-date fair value of stock options granted
$
16.88

 
$
8.39

 
$
7.41

Total fair value of stock options vested
$
20,457,096

 
$
22,421,290

 
$
31,140,184

Total intrinsic value of stock options exercised
$
235,540,914

 
$
95,033,640

 
$
23,139,194

Tax benefit realized from stock options exercised
$
61,354,379

 
$
25,274,158

 
$
10,835,473
Fair value of options, weighted average valuation assumptions
The fair value of stock options is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
 
For the Years Ended
 
February 28, 2014
 
February 28, 2013
 
February 29, 2012
Expected life
5.9 years

 
6.0 years

 
5.9 years

Expected volatility
34.8
%
 
32.7
%
 
32.0
%
Risk-free interest rate
0.9
%
 
1.4
%
 
2.7
%
Expected dividend yield
0.0
%
 
0.0
%
 
0.0
%
Fair value of performance stock units, weighted average valuation assumptions
The fair value of performance share units granted with a market condition is estimated on the date of grant using the Monte Carlo Simulation model with the following weighted average assumptions:
 
For the Years Ended
 
February 28, 2014
 
February 28, 2013
Grant-date price
$
48.89

 
$
24.50

Performance period
3.0 years

 
2.9 years

Expected volatility
38.7
%
 
28.6
%
Risk-free interest rate
0.4
%
 
0.5
%
Expected dividend yield
0.0
%
 
0.0
%
Fair value of purchase rights, weighted average valuation assumptions
The fair value of purchase rights granted is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
 
For the Years Ended
 
February 28, 2014
 
February 28, 2013
 
February 29, 2012
Expected life
0.5 years

 
0.5 years

 
0.5 years

Expected volatility
24.3
%
 
41.8
%
 
30.4
%
Risk-free interest rate
0.1
%
 
0.1
%
 
0.2
%
Expected dividend yield
0.0
%
 
0.0
%
 
0.0
%