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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 29, 2018 | Apr. 30, 2017
Income Taxes [Line Items] |  |
U.S. foreign income tax credits | $ 5,720 | $ 44,917
U.S. foreign income tax credits, expiration period | 10 years |
U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards | $ 11,500 |
Operating loss carryforwards, related future tax benefits | $ 2,500 |
Earliest Tax Year [Member] | U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration fiscal year | 2027 |
Latest Tax Year [Member] | U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration fiscal year | 2035 |

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