Concentration of Risk - Schedule of Significant Customers Accounting for at Least 10% of Net Sales During Period (Details)		3 Months Ended		12 Months Ended
		Apr. 29, 2018	Apr. 30, 2017	Jan. 28, 2018
Net sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		100.00%	100.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Trend-tek Technology Ltd And Affiliates [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%		8.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Frontek Technology Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%		9.00%
Customer Concentration Risk [Member] | Net sales [Member] | Arrow Electronics And Affiliates [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%	9.00%
Customer Concentration Risk [Member] | Net sales [Member] | Trend-tek Technology Ltd And Affiliates [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%	10.00%
Customer Concentration Risk [Member] | Net sales [Member] | Samsung Electronics And Affiliates [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		8.00%	7.00%
Customer Concentration Risk [Member] | Net sales [Member] | Premier Technical Sales Korea, Inc. And Affiliates [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	[1]	5.00%	7.00%

[1] Premier is a distributor with a concentration of sales to Samsung. The above percentages represent the Company's estimate of the sales activity related to Samsung that is passing through this distributor.