Revenue Recognition - Cumulative Effects of Adjustments on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Feb. 01, 2018	Jan. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred revenue, current	$ 529		$ 307
Retained earnings	230,861		$ 261,265
Topic 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred revenue, current		$ 264
Retained earnings		261,308
Topic 606 [Member] | Adjustment [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred revenue, current	4,957	(43)
Retained earnings	$ (4,745)	$ 43