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Pension Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 29, 2016
Oct. 24, 2015
Oct. 29, 2016
Oct. 24, 2015
Net periodic pension costs        
Service cost $ 319 $ 333 $ 638 $ 666
Interest cost 1,170 1,211 2,340 2,422
Expected return on plan assets (1,245) (1,226) (2,490) (2,452)
Net amortization 764 736 1,528 1,472
Net periodic pension cost $ 1,008 $ 1,054 $ 2,016 $ 2,108