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Income Taxes - Deferred Income Taxes - Undistributed Earnings from Foreign Subsidiaries - Narrative (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
May 01, 2016
Income Tax Disclosure [Abstract]    
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely $ 146,900 $ 129,600
Deferred tax liability, undistributed earnings from foreign subsidiaries 497 604
U.S. income and foreign withholding taxes 44,000 38,500
U.S. foreign income tax credits $ 43,500 $ 37,900