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Income Taxes - Differences Between Income Tax Expense at Federal Income Tax Rate and Effective Income Tax Rate (Detail)
9 Months Ended
Jan. 29, 2017
Jan. 31, 2016
Income Tax Disclosure [Abstract]    
Federal income tax rate 34.00% 34.00%
Tax effects of Chinese foreign exchange gains 1.90% 3.50%
Reversal of foreign uncertain tax position (9.10%)  
U.S state income tax expense 0.60% 0.70%
Other 1.50% (2.50%)
Effective income tax rate 28.90% 35.70%