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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Components of net periodic benefit cost [Abstract]    
Service cost $ 279 $ 311
Interest cost 1,267 1,206
Expected return on plan assets (1,269) (1,699)
Net amortization 665 891
Net periodic pension cost $ 942 $ 709