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Segment Information - Revenue by Country (Details) - Net sales revenue | 12 Months Ended
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Jan. 26, 2020 | Jan. 27, 2019 | Jan. 28, 2018
Geographic Information And Concentration Of Risk [Line Items] |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00%
Geographic Concentration Risk [Member] |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |
Concentration risk, percentage | 62.00% | 66.00% | 60.00%
China Including Hong Kong [Member] | Geographic Concentration Risk [Member] |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |
Concentration risk, percentage | 53.00% | 55.00% | 51.00%
United States | Geographic Concentration Risk [Member] |  |  |
Geographic Information And Concentration Of Risk [Line Items] |  |  |
Concentration risk, percentage | 9.00% | 11.00% | 9.00%

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