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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 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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