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Income Taxes - Income Tax Reconciliation (Details) (USD $) | 12 Months Ended
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May 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Income tax at statutory rate | $ 26,500,000 | $ 13,300,000 | $ 4,100,000
State income taxes, net of federal benefit | 400,000 | 100,000 | 0
Foreign operations with lower statutory rates | (13,200,000) | (11,400,000) | (10,900,000)
Foreign losses with no tax benefit | 1,000,000 | 1,900,000 | 800,000
Foreign investment tax credit (FTC) | 1,600,000 | (7,500,000) | (800,000)
Change in tax contingency reserve | 200,000 | (100,000) | (300,000)
Change in permanent reinvestment assertion | (2,800,000) | 0 | 9,600,000
Change in valuation allowance | (32,600,000) | (1,200,000) | 400,000
Other, net | (1,400,000) | 900,000 | 300,000
Income tax expense/(benefit) | (20,300,000) | (2,500,000) | 3,200,000
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Income tax at statutory rate (as a percent) | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit (as a percent) | 0.50% | 0.30% | 0.30%
Foreign operations with lower statutory rates (as a percent) | (17.40%) | (30.10%) | (94.30%)
Foreign losses with no tax benefit (as a percent) | 1.30% | 5.00% | 7.30%
Foreign investment tax credit (FTC) (as a percent) | 2.10% | (19.80%) | (6.80%)
Change in tax contingency reserve (as a percent) | 0.30% | (0.10%) | (2.20%)
Change in permanent reinvestment assertion (as a percent) | (3.70%) | 0.00% | 82.70%
Change in valuation allowance (as a percent) | (43.00%) | (3.30%) | 3.40%
Other, net (as a percent) | (1.80%) | 2.40% | 2.50%
Income tax provision (as a percent) | (26.70%) | (6.60%) | 27.90%
Income paxes paid | 6,200,000 | 5,900,000 | 4,000,000
Tax provision on undistributed net income of foreign operations | 0 |  |
Undistributed net income | 198,700,000 |  |
Approximate additional income tax expense if undistributed earnings were distributed | $ 69,600,000 |  |

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