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Capital Stock - Schedule of Ordinary Shares Reserved for Future Issuance under EIP and ESPP (Detail) - shares
Jan. 31, 2021
Jan. 31, 2020
EIP [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares reserved 5,981,741 6,045,108
ESPP [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares reserved 2,299,143 2,059,504