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Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | Jan. 24, 2020 | Apr. 27, 2019 | Apr. 26, 2019
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Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Operating lease ROU assets, net of deferred rent and lease restructuring liabilities | $ 142 |  | $ 0
Operating lease liabilities | $ 149 |  |
ASU 2016-02 |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |
Operating lease ROU assets, net of deferred rent and lease restructuring liabilities |  | $ 149 |
Operating lease liabilities |  | 158 |
Cumulative-effect adjustment to retained earnings |  | $ 6 | $ 6

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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