Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2021	Jun. 30, 2019	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021	Jul. 31, 2018
Line of Credit Facility [Line Items]
Term loan facility interest expense incurred			$ 0.0	$ 0.8
Term loan facility accrued interest			$ 0.0		$ 0.0		$ 0.0
2018 Loan
Line of Credit Facility [Line Items]
Term loan facility maximum borrowing capacity								$ 45.0
Term loan facility borrowings during the period		$ 35.0
Payment of issuance costs		1.1
Proceeds from term loan facility		$ 33.9
Term loan facility term		5 years
Term loan facility interest rate description		LIBOR plus 6.55%
Term loan facility interest rate		6.55%
Term loan facility interest expense incurred					$ 1.5	$ 1.6
Repayments of term loan facility	$ 35.0
Payments of accrued interest and prepayment fees	$ 1.2