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Net Loss per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Numerator:      
Net loss $ (202,948) $ (168,227) $ (168,557)
Add: accretion of redeemable convertible preferred stock 0 (11,503) (341)
Net loss attributable to common stockholders $ (202,948) $ (181,992) $ (168,898)
Denominator:      
Weighted-average number of shares outstanding—basic and diluted 121,240 15,854 11,341
Net loss per share attributable to common stockholders—basic and diluted $ (1.67) $ (11.48) $ (14.89)
Class A Common Stock      
Numerator:      
Net loss $ (49,448) $ (1,677)  
Add: accretion of redeemable convertible preferred stock   (115)  
Add: deemed dividend on the conversion of Series F redeemable convertible preferred stock   (23)  
Net loss attributable to common stockholders $ (49,448) $ (1,815)  
Denominator:      
Weighted-average number of shares outstanding—basic and diluted 29,540 158  
Net loss per share attributable to common stockholders—basic and diluted $ (1.67) $ (11.48) [1]  
Class B Common Stock      
Numerator:      
Net loss $ (153,500) $ (166,550) $ (168,557)
Add: accretion of redeemable convertible preferred stock   (11,388) (341)
Add: deemed dividend on the conversion of Series F redeemable convertible preferred stock   (2,239)  
Net loss attributable to common stockholders $ (153,500) $ (180,177) $ (168,898)
Denominator:      
Weighted-average number of shares outstanding—basic and diluted 91,700 15,696 11,341
Net loss per share attributable to common stockholders—basic and diluted $ (1.67) $ (11.48) $ (14.89)
[1] Amounts cannot be recalculated due to rounding