Government Incentives - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 29, 2017 USD ($)	Aug. 04, 2018 USD ($)	Jul. 29, 2017 USD ($)	Aug. 04, 2018 USD ($) Job	Jul. 29, 2017 USD ($)	Jan. 28, 2017 USD ($)	Feb. 03, 2018 USD ($)
Government Incentive Assistance Program [Line Items]
Deferred tax assets		$ 4,241		$ 4,241			$ 2,829
Grow New Jersey Assistance Program (Grow NJ)
Government Incentive Assistance Program [Line Items]
Income tax credits granted from state incentive package		40,000		$ 40,000
Transferrable income tax credit period				10 years
Government incentive assistance program award period				10 years
Project development, eligible amount per new full time job				$ 7
Government incentive assistance program annual award limit				$ 4,000
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
Deferred tax assets		2,829		$ 2,829
Cash proceeds net of costs from government incentive assistance program	$ 3,251
Income tax credits earned from state incentive package						$ 3,612
Cost reduction related to award		$ 710	$ 718	$ 1,285	$ 1,436
Grow New Jersey Assistance Program (Grow NJ) | Minimum
Government Incentive Assistance Program [Line Items]
Government incentive assistance program number of eligible jobs | Job				100