Government Incentives - Additional Information (Details) - Grow New Jersey Assistance Program (Grow NJ)	3 Months Ended		12 Months Ended
	Apr. 29, 2017 USD ($) Job	Apr. 30, 2016 USD ($)	Jan. 30, 2016 USD ($)	Jan. 28, 2017 USD ($)
Government Incentive Assistance Program [Line Items]
Income tax credits granted from state incentive package	$ 40,000,000
Transferrable income tax credit period	10 years
Government incentive assistance program minimum capital investment	$ 20,000,000
Government incentive assistance program maximum award limit	$ 40,000,000
Government incentive assistance program award period	10 years
Project development, eligible amount per new full time job	$ 7,000
Government incentive assistance program annual award limit	$ 4,000,000
Award compliance period	5 years
Award Compliance Description	After the end of the ten-year Grow NJ award earnings period there is a five-year compliance period during which the Company must maintain the average of its annual eligible jobs certified during the preceding ten years or a pro-rata amount up to one-tenth of the previously awarded income tax credits would be subject to recapture and repayment to the State of New Jersey annually during the five-year compliance period.
Agreement to sell annual income tax credits awarded, Description	75% or more
Cash proceeds net of costs from government incentive assistance program	$ 3,251,000
Income tax credits earned from state incentive package			$ 3,612,000
Cost reduction related to award	718,000	$ 900,000
Cost reduction related to award amount recognized in income statement	713,000	763,000
Offset to cost of goods sold	514,000	512,000
Offset to selling general and administrative expenses	199,000	$ 251,000
Reduction in inventory overhead	$ 815,000			$ 810,000
Minimum
Government Incentive Assistance Program [Line Items]
Government incentive assistance program number of eligible jobs | Job	100