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Income Taxes - Income Tax Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Income tax at statutory rate $ 13,283 $ 4,067 $ 5,169
State income taxes, net of federal benefit 98 29 84
Foreign operations with lower statutory rates (11,414) (10,955) (10,640)
Foreign losses with no tax benefit 1,897 845 289
Foreign investment tax credit (FTC) (7,519) (791) (1,276)
Change in tax contingency reserve (20) (251) (2,716)
Goodwill impairment 1,514 0 0
Change in permanent reinvestment assertion 0 9,613 0
Change in valuation allowance (1,234) 392 5,613
Other, net 902 287 (599)
Total income tax provision/(benefit) (2,493) 3,236 (4,076)
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) 0.30% 0.30% 0.60%
Foreign operations with lower statutory rates (as a percent) (30.10%) (94.30%) (72.10%)
Foreign losses with no tax benefit (as a percent) 5.00% 7.30% 2.00%
Foreign investment tax credit (FTC) (as a percent) (19.80%) (6.80%) (8.60%)
Change in tax contingency reserve (as a percent) (0.10%) (2.20%) (18.40%)
Goodwill impairment (as a percent) 4.00% 0.00% 0.00%
Change in permanent reinvestment assertion (as a percent) 0.00% 82.70% 0.00%
Change in valuation allowance (as a percent) (3.30%) 3.40% 38.00%
Other, net (as a percent) 2.40% 2.50% (4.10%)
Income tax provision (as a percent) (6.60%) 27.90% (27.60%)
Income paxes paid 5,878 4,028 5,187
Income Tax Payments (Refunds) [Line Items]      
Tax provision on undistributed net income of foreign operations 0    
Undistributed net income 149,146    
Approximate additional income tax expense if undistributed earnings were distributed 52,201    
United States
      
Income Tax Payments (Refunds) [Line Items]      
Income tax refunds received     $ 13,208