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Common Stock and Stockholders' Equity (Deficit) (Details) - $ / shares
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Class Of Stock [Line Items]    
Common Stock, shares authorized   1,300,000,000
Common Stock, par value   $ 0.0001
Preferred stock, shares authorized 100,000,000 100,000,000
Common Stock, conversion features Established that shares of our Class B common stock are voluntarily convertible into shares of our Class A common stock at the option of the holder and generally automatically convertible into shares of our Class A common stock upon transfer.  
Treasury Stock, shares 3,052,953 3,052,953
Class A Common Stock    
Class Of Stock [Line Items]    
Common Stock, shares authorized 1,000,000,000 1,000,000,000
Common Stock, par value $ 0.0001 $ 0.0001
Common stock, voting rights 1 vote per share  
Class B Common Stock    
Class Of Stock [Line Items]    
Common Stock, shares authorized 200,000,000 200,000,000
Common Stock, par value $ 0.0001 $ 0.0001
Common stock, voting rights 10 votes per share