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Income Taxes - 2017 Tax Cuts and Jobs Act - Narrative (Detail) | 6 Months Ended | 12 Months Ended
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Oct. 28, 2018 | Oct. 29, 2017 | Apr. 28, 2019 | Apr. 29, 2018
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate | 21.00% | 34.00% |  | 30.40%
Scenario, Forecast [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate |  |  | 21.00% |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Details
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