Income Taxes - Summary of Tax Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 12,526
Balance at End of Period	14,670	$ 12,526
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	12,526	18,538	$ 15,061
Additional Charged to Expenses	2,144	1,978	3,477
Additions Charged to Other Account	0	0	0
Deductions Charged to Expenses or Other Accounts	0	(7,990)	0
Balance at End of Period	$ 14,670	$ 12,526	$ 18,538