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Concentration of Risk - Narrative (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 27, 2019 | Oct. 28, 2018 | Oct. 27, 2019 | Oct. 28, 2018
Net sales |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Net sales | Distributor concentration risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 76.00% | 69.00% | 70.00% | 68.00%
China | Cost of Silicon Wafers | Supplier concentration risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 30.00% | 15.00% | 23.00% | 16.00%
Israel | Cost of Silicon Wafers | Supplier concentration risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% | 9.00% | 12.00% | 11.00%

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