Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

v3.8.0.1
Stockholders' Equity (Details) - shares
 12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Class A Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 257,506,184    
Treasury Stock, beginning of period 86,262,971    
Common Stock, end of period 258,718,356 257,506,184  
Treasury Stock, end of period 90,743,239 86,262,971  
Class B Convertible Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 28,358,527    
Treasury Stock, beginning of period 5,005,800    
Common Stock, end of period 28,335,387 28,358,527  
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 2,080    
Common Stock, end of period 1,970 2,080  
Common Stock [Member] | Class A Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common Stock, beginning of period 257,506,184 255,558,026 250,839,359
Share repurchases 0 0 0
Conversion of shares 29,640 2 31,079
Exercise of stock options 1,182,532 1,948,156 4,687,588
Employee stock purchases 0 0 0
Grant of restricted stock awards 0 0 0
Cancellation of restricted shares     0
Common Stock, end of period 258,718,356 257,506,184 255,558,026
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 28,358,527 28,358,529 28,389,608
Share repurchases 0 0 0
Conversion of shares (23,140) (2) (31,079)
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
Common Stock, end of period 28,335,387 28,358,527 28,358,529
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 2,080 2,000 0
Share repurchases 0 0 0
Conversion of shares (6,500) 0 0
Exercise of stock options 6,390 80 2,000
Employee stock purchases 0 0 0
Grant of restricted stock awards 0 0 0
Cancellation of restricted shares     0
Common Stock, end of period 1,970 2,080 2,000
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 86,262,971 79,454,011 79,681,859
Share repurchases 4,810,061 7,407,051 246,143
Conversion of shares 0 0 0
Exercise of stock options 0 0 0
Employee stock purchases (75,023) (77,671) (89,155)
Grant of restricted stock awards (3,848) (4,088) (4,984)
Cancellation of restricted shares     244
Treasury Stock, end of period 90,743,239 86,262,971 79,454,011
Treasury Stock [Member] | Class A Common Stock [Member] | Restricted stock units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units (181,994) (325,773) (157,052)
Shares withheld to satisfy tax withholding requirements 117,188 241,870 112,851
Treasury Stock [Member] | Class A Common Stock [Member] | Performance share units [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Vesting of stock units (68,928) (190,559) (223,044)
Shares withheld to satisfy tax withholding requirements 55,584 168,811 216,396
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
Share repurchases 0 0 0
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
Treasury Stock, end of period 5,005,800 5,005,800 5,005,800
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