Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

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Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Nov. 30, 2019
Aug. 31, 2019
Aug. 31, 2018
May 31, 2018
Nov. 30, 2019
Jan. 31, 2018
Equity, Class of Treasury Stock [Line Items]            
Dollar value of shares repurchased   $ 50,000,000.0 $ 404,300,000 $ 100,000,000.0    
Class A and Class B [Member] | 2018 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase authorization           $ 3,000,000,000.0
Class A Common Stock [Member] | 2018 Authorization [Member]            
Equity, Class of Treasury Stock [Line Items]            
Share repurchases 4,897,605       265,593  
Dollar value of shares repurchased $ 1,045,900,000       $ 50,000,000.0