Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

v3.7.0.1
Stockholders' Equity (Details) - shares
 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Exercise of stock options 1,948,236 4,689,588 2,527,458
Class A Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 255,558,026    
Treasury Stock, beginning of period 79,454,011    
Common Stock, end of period 257,506,184 255,558,026  
Treasury Stock, end of period 86,262,971 79,454,011  
Class B Convertible Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 28,358,529    
Treasury Stock, beginning of period 5,005,800    
Common Stock, end of period 28,358,527 28,358,529  
Treasury Stock, end of period 5,005,800 5,005,800  
Class 1 Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 2,000    
Common Stock, end of period 2,080 2,000  
Common Stock [Member] | Class A Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 255,558,026 250,839,359 248,264,944
Conversion of shares 2 31,079 46,957
Exercise of stock options 1,948,156 4,687,588 2,527,458
Employee stock purchases 0 0 0
Grant of restricted stock awards 0 0 0
Cancellation of restricted shares   0 0
Common Stock, end of period 257,506,184 255,558,026 250,839,359
Share repurchases 0 0  
Common Stock [Member] | Class A Common Stock [Member] | Restricted stock units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Common Stock [Member] | Class A Common Stock [Member] | Performance share units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Common Stock [Member] | Class B Convertible Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 28,358,529 28,389,608 28,436,565
Conversion of shares (2) (31,079) (46,957)
Exercise of stock options 0 0 0
Employee stock purchases 0 0 0
Grant of restricted stock awards 0 0 0
Cancellation of restricted shares   0 0
Common Stock, end of period 28,358,527 28,358,529 28,389,608
Share repurchases 0 0  
Common Stock [Member] | Class B Convertible Common Stock [Member] | Restricted stock units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Common Stock [Member] | Class B Convertible Common Stock [Member] | Performance share units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Common Stock [Member] | Class 1 Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 2,000 0 0
Conversion of shares 0 0 0
Exercise of stock options 80 2,000 0
Employee stock purchases 0 0 0
Grant of restricted stock awards 0 0 0
Cancellation of restricted shares   0 0
Common Stock, end of period 2,080 2,000 0
Share repurchases 0 0  
Common Stock [Member] | Class 1 Common Stock [Member] | Restricted stock units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Common Stock [Member] | Class 1 Common Stock [Member] | Performance share units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Treasury Stock [Member] | Class A Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Treasury Stock, beginning of period 79,454,011 79,681,859 80,225,575
Conversion of shares 0 0 0
Exercise of stock options 0 0 0
Employee stock purchases (77,671) (89,155) (117,301)
Grant of restricted stock awards (4,088) (4,984) (6,424)
Cancellation of restricted shares   244 8,426
Treasury Stock, end of period 86,262,971 79,454,011 79,681,859
Share repurchases 7,407,051 246,143  
Treasury Stock [Member] | Class A Common Stock [Member] | Restricted stock units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units (325,773) (157,052) (140,396)
Shares withheld to satisfy tax withholding requirements 241,870 112,851 101,499
Treasury Stock [Member] | Class A Common Stock [Member] | Performance share units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units (190,559) (223,044) (288,021)
Shares withheld to satisfy tax withholding requirements 168,811 216,396 248,499
Treasury Stock [Member] | Class B Convertible Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Treasury Stock, beginning of period 5,005,800 5,005,800 5,005,800
Conversion of shares 0 0 0
Exercise of stock options 0 0 0
Employee stock purchases 0 0 0
Grant of restricted stock awards 0 0 0
Cancellation of restricted shares   0 0
Treasury Stock, end of period 5,005,800 5,005,800 5,005,800
Share repurchases 0 0  
Treasury Stock [Member] | Class B Convertible Common Stock [Member] | Restricted stock units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0
Treasury Stock [Member] | Class B Convertible Common Stock [Member] | Performance share units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units 0 0 0