Segment Information - Significant Customers (Details) - Customer Concentration Risk	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Net sales revenue | Trend-tek Technology Ltd (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	10.00%	10.00%
Net sales revenue | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	7.00%	8.00%
Net sales revenue | Arrow Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	11.00%	10.00%
Net sales revenue | Samsung Electronics (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	8.00%	8.00%	7.00%
Net sales revenue | Premier Technical Sales Korea, Inc. (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	4.00%	6.00%	4.00%
Accounts Receivable | Trend-tek Technology Ltd (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	8.00%
Accounts Receivable | Frontek Technology Corporation (and affiliates)
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	9.00%