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Income Taxes - Difference Between Income Tax Expense at Federal Income Tax Rate and Effective Income Tax Rate (Detail)
9 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Income Tax Disclosure [Abstract]    
federal income tax rate 34.00% 34.00%
foreign tax rate differential (6.60%) (6.00%)
undistributed earnings from foreign subsidiaries 1.40% 4.10%
increase in liability for uncertain tax positions 2.90% 3.50%
tax effects of Chinese foreign exchange gains 3.50% 0.20%
other 0.50% 1.80%
Effective income tax rate 35.70% 37.60%