Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - 2017 Authorization [Member] - USD ($)
6 Months Ended
Aug. 31, 2017
Aug. 31, 2017
Nov. 30, 2016
Class A and Class B [Member]      
Equity, Class of Treasury Stock [Line Items]      
Repurchase Authorization     $ 1,000,000,000
Class A Common Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Dollar Value of Shares Repurchased $ 467,400,000 $ 14,300,000  
Number of Shares Repurchased 3,079,676 73,129