Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 377	$ 266	$ 404
Provision/(Benefit) Charged to Operations	310	119	(80)
Deductions	(166)	(8)	(58)
Balance at End of Year	$ 521	$ 377	$ 266