Fair Value Measurements - Summary of Outstanding Balance Sheet Hedges (Detail) - Foreign currency derivative contracts - Derivatives not designated as hedging instruments [Member] - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 75	$ 0
Accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 42	$ 88