Concentration of Risk - Schedule of Significant Customers Accounting for at Least 10% of Net Sales During Period (Details)	12 Months Ended
	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Net sales
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Net sales
Concentration Risk [Line Items]
Concentration risk, percentage	62.00%	66.00%	60.00%
Customer Concentration Risk | Accounts Receivable | Trend-tek Technology Ltd (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	13.00%	11.00%
Customer Concentration Risk | Accounts Receivable | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	10.00%
Customer Concentration Risk | Accounts Receivable | CEAC International Ltd. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	7.00%
Customer Concentration Risk | Net sales | Trend-tek Technology Ltd (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	13.00%	14.00%	10.00%
Customer Concentration Risk | Net sales | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	11.00%	7.00%
Customer Concentration Risk | Net sales | Arrow Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	10.00%	11.00%
Customer Concentration Risk | Net sales | Samsung Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	4.00%	8.00%	8.00%
Customer Concentration Risk | Net sales | Premier Technical Sales Korea, Inc. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	7.00%	4.00%	6.00%
United States | Geographic Concentration Risk [Member] | Net sales
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	11.00%	9.00%