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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
May. 02, 2015
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Tax Credit Carryforward [Line Items]        
Unrecognized tax benefits attributable to book to tax differences in share-based compensation $ 4,500,000 $ 4,500,000    
Deferred tax benefit related to release of foreign valuation allowance 7,200,000 6,300,000 $ (2,500,000) $ 7,200,000
Deferred tax benefit related to release of state valuation allowance   1,400,000    
Valuation allowance 2,000,000 2,000,000 14,000,000  
Federal income tax benefit   700,000    
State income tax benefit   3,800,000    
Foreign tax credit carryforward 3,700,000 3,700,000 11,000,000  
Research tax credits 0 0 600,000  
Income taxes paid   9,000,000 6,200,000 $ 5,900,000
Tax provision on undistributed net income of foreign operations 0 0    
Undistributed foreign earnings 276,000,000 276,000,000    
Approximate additional income tax expense if undistributed earnings were distributed   96,600,000    
Unrecognized tax benefits 900,000 900,000 $ 600,000  
Unrecognized tax benefits that, if recognized, would impact effective tax rate 900,000 900,000    
Accrued for interest on income tax matters 100,000 100,000    
Accrued for penalties on income tax matters 0 0    
Federal        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 2,100,000 2,100,000    
State        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards $ 80,600,000 $ 80,600,000    
Foreign tax authority | Investment tax credit | Malta        
Tax Credit Carryforward [Line Items]        
Percentage of qualified expenditures subject to investment tax credit 30.00% 30.00%    
Amount of unused credits $ 16,100,000 $ 16,100,000    
Federal and state operating loss carryforwards        
Tax Credit Carryforward [Line Items]        
Valuation allowance $ 1,200,000 $ 1,200,000