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Income Taxes - Deferred Income Taxes - Undistributed Earnings from Foreign Subsidiaries - Narrative (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Apr. 28, 2019 | Apr. 29, 2018 | Apr. 30, 2017
Income Taxes [Line Items] |  |  |  |
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely | $ 156,700 |  |  |
U.S. foreign income tax credits | $ 42,200 |  |  |
Deferred tax liability, undistributed earnings from foreign subsidiaries |  |  | $ 4,256 | $ 43,978
Scenario, Forecast [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Dividends received deduction percentage for earnings and profits received from foreign corporation |  | 100.00% |  |
Dividends received deduction, foreign corporation ownership percentage |  | 10.00% |  |

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