Concentration of Risk - Narrative (Details)	3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jul. 28, 2019	Jul. 26, 2020	Jul. 28, 2019
Concentration Risk [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
China | Cost of Silicon Wafers | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%	23.00%	20.00%	20.00%
Israel | Cost of Silicon Wafers | Supplier concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	14.00%	9.00%	13.00%