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% |