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Income Taxes - Income Tax Reconciliation (Details) (USD $)
 12 Months Ended
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