Revenue - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Revenue From Contract With Customer [Line Items]
Capitalized contract cost, amortization period	3 years		3 years
Capitalized contract cost, amortization	$ 1,250,000	$ 489,000	$ 1,775,000	$ 974,000
Capitalized contract cost, impairment loss	0	0	0	0
Subscription and Related Services
Revenue From Contract With Customer [Line Items]
Lease income	$ 1,585,000	$ 1,506,000	$ 3,139,000	$ 2,966,000