Income Taxes - Summary of Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (14,009)	$ (8,213)	$ (28,346)	$ (24,258)
Provision for income taxes	$ 747	$ 1,978	$ 1,873	$ 3,244
Effective tax rate	(5.30%)	(24.10%)	(6.60%)	(13.40%)