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Net Loss per Share Attributable to Common Stockholders - Calculation of basic and diluted net loss per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Numerator:      
Net loss $ (243,267) $ (208,359) $ (426,458)
Less: preferred stock accretion 0 0 (353)
Net loss attributable to common stockholders $ (243,267) $ (208,359) $ (426,811)
Denominator:      
Weighted-average common shares outstanding (in shares) 185,760 176,704 135,163
Net loss per share attributable to common stockholders:      
Basic and diluted (in usd per share) $ (1.31) $ (1.18) $ (3.16)