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Restructuring (Details) (USD $)
3 Months Ended
Jul. 26, 2014
facility
Jul. 27, 2013
Restructuring    
Number of facilities currently being marketed for sale 2  
Restructuring charges    
Pre-tax restructuring charges since inception of plan $ 7,700,000  
Restructuring charges since inception of plan, net of tax 5,000,000  
Pre-tax restructuring income 347,000 (87,000)
Restructuring income, net of tax (200,000)  
Restructuring liability 400,000  
Continuing Operations [Member]
   
Restructuring charges    
Pre-tax restructuring charges since inception of plan 4,500,000  
Restructuring charges since inception of plan, net of tax 2,900,000  
Discontinued Operations [Member]
   
Restructuring charges    
Pre-tax restructuring charges since inception of plan 3,200,000  
Restructuring charges since inception of plan, net of tax $ 2,100,000