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Commitments and Contingencies - Additional Information (Details) - USD ($)
12 Months Ended
Jan. 31, 2019
Jul. 31, 2019
May 30, 2019
Commitments And Contingencies Disclosure [Line Items]      
Non-cancelable purchase commitments $ 4,200,000 $ 6,000,000  
Loss contingencies   $ 0  
Tax litigation amount 600,000    
Cumulative charges of litigation loss 300,000    
Settlement fund for payment to class members     $ 8,650,000
Other current assets      
Commitments And Contingencies Disclosure [Line Items]      
Amount of receivables in other current assets $ 300,000