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Income Taxes - Income Tax Expense (Parenthetical) (Detail) $ in Thousands | 12 Months Ended
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Apr. 29, 2018 USD ($)
Income Tax Disclosure [Abstract] |  |
2017 Tax Cuts and Jobs Act income tax benefit | $ 6,903 | [1]
establishment of valuation allowance | $ 4,550 | [2]
[1] | The income tax benefit of $6,903 includes a charge of $4,550 for the establishment of a valuation allowance against U.S. foreign tax credits that are more-likely-than not to be realized as a result of the 2017 Tax Cuts and Jobs Act.
[2] | The establishment of this valuation allowance pertains to U.S. foreign tax credits that are more-likely-than not to be realized as a result of the Tax Act.

X
- Definition Amount of reasonable estimate for income tax expense from establishment of valuation allowance against unused foreign tax credits pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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X
- Definition Amount of reasonable estimate for deferred income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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