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Net Loss Per Share Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Numerator:      
Net loss $ (208,913) $ (125,497) [1] $ (109,849) [1]
Denominator:      
Weighted-average shares outstanding, basic and diluted (in shares) 117,221 107,504 83,004
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (1.78) $ (1.17) $ (1.32)
Class A Common Stock      
Denominator:      
Weighted-average shares outstanding, basic and diluted (in shares) 107,809 92,452 24,165
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (1.78) $ (1.17) $ (1.32)
Class B Common Stock      
Denominator:      
Weighted-average shares outstanding, basic and diluted (in shares) 9,412 15,052 58,839
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (1.78) $ (1.17) $ (1.32)
Common Stock | Class A Common Stock      
Numerator:      
Net loss $ (192,138) $ (107,926) $ (31,980)
Common Stock | Class B Common Stock      
Numerator:      
Net loss $ (16,775) $ (17,571) $ (77,869)
[1] Adjusted for adoption of ASC 842. See Note 2.