Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Jan. 31, 2021 |
Jan. 26, 2020 |
|
| Property, Plant and Equipment [Line Items] | ||
| Deferred tax assets, valuation allowance | $ 728 | $ 621 |
| Building | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant & equipment, useful life | 30 years | |
| Minimum | ||
| Property, Plant and Equipment [Line Items] | ||
| Warranty liability, term | 1 year | |
| Property, plant & equipment, useful life | 3 years | |
| Intangible assets, useful life | 2 years | |
| Minimum | Building | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant & equipment, useful life | 25 years | |
| Maximum | ||
| Property, Plant and Equipment [Line Items] | ||
| Warranty liability, term | 3 years | |
| Property, plant & equipment, useful life | 5 years | |
| Intangible assets, useful life | 20 years | |
| Maximum | Building | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant & equipment, useful life | 30 years |