XML 54 R44.htm IDEA: XBRL DOCUMENT v3.20.2
Property and Equipment, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Property Plant And Equipment [Abstract]        
Depreciation of property and equipment $ 0.6 $ 0.7 $ 1.3 $ 1.4