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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
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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%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign exchange gain or loss. + References No definition available. + Details
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