XML 77 R66.htm IDEA: XBRL DOCUMENT v3.21.1
Geographic Information - Additional Information (Details) - Long-Lived Assets - Geographic Concentration Risk
3 Months Ended 12 Months Ended
Apr. 30, 2021
Jan. 31, 2021
United States    
Concentration Risk [Line Items]    
Concentration risk, percentage 86.00% 87.00%
Canada    
Concentration Risk [Line Items]    
Concentration risk, percentage 14.00% 13.00%