Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

v3.8.0.1
Stockholders' Equity (Details Textual) - USD ($)
 9 Months Ended
Jan. 05, 2018
Nov. 30, 2017
Nov. 30, 2017
Nov. 30, 2016
Class A and Class B [Member] | 2017 Authorization [Member]        
Equity, Class of Treasury Stock [Line Items]        
Repurchase authorization       $ 1,000,000,000
Class A and Class B [Member] | 2018 Authorization [Member] | Subsequent Event [Member]        
Equity, Class of Treasury Stock [Line Items]        
Repurchase authorization $ 3,000,000,000.0      
Class A Common Stock [Member] | 2017 Authorization [Member]        
Equity, Class of Treasury Stock [Line Items]        
Number of shares repurchased   4,130,031 1,123,484  
Dollar value of shares repurchased   $ 692,300,000 $ 239,200,000  
Class A Common Stock [Member] | 2018 Authorization [Member] | Subsequent Event [Member]        
Equity, Class of Treasury Stock [Line Items]        
Number of shares repurchased 0