Rollforward of Liabilities Recognized in Consolidated Balance Sheets (Detail) - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Restructuring And Related Activities [Abstract]
Accrued liability as of January 31, 2015	$ 2,441,000
Add: Costs incurred, excluding non-cash charges	590,000	$ 0	$ 17,752,000
Less: Cash payments and adjustments	(1,856,000)
Accrued liability as of January 30, 2016	$ 1,175,000	$ 2,441,000