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Employee Benefits and Deferred Compensation - Amount Contributed under 401(k) Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015
Compensation And Retirement Disclosure [Abstract] |  |  |
401(k) matching contributions | $ 30 | $ 35 | $ 16

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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