Concentration of Risk - Schedule of Significant Customers Accounting for at Least 10% of Net Sales During Period (Details)			3 Months Ended
	Apr. 26, 2020	Jan. 26, 2020	Apr. 26, 2020	Apr. 28, 2019
Net sales
Concentration Risk [Line Items]
Concentration risk, percentage			100.00%	100.00%
Customer Concentration Risk | Accounts Receivable | Trend-tek Technology Ltd. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%	13.00%
Customer Concentration Risk | Accounts Receivable | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	8.00%	11.00%
Customer Concentration Risk | Accounts Receivable | CEAC International Limited
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	11.00%
Customer Concentration Risk | Net sales | Trend-tek Technology Ltd. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			15.00%	12.00%
Customer Concentration Risk | Net sales | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			12.00%	10.00%
Customer Concentration Risk | Net sales | CEAC International Limited
Concentration Risk [Line Items]
Concentration risk, percentage			12.00%	4.00%
Customer Concentration Risk | Net sales | Premier Technical Sales Korea, Inc. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			9.00%	5.00%
Customer Concentration Risk | Net sales | Samsung Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			2.00%	8.00%
Customer Concentration Risk | Net sales | Huawei Technologies Co. Ltd. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage			7.00%	16.00%