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Pension Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 23, 2016
Jan. 24, 2015
Jan. 23, 2016
Jan. 24, 2015
Components of net periodic pension cost        
Service cost $ 333 $ 279 $ 999 $ 837
Interest cost 1,211 1,267 3,633 3,801
Expected return on plan assets (1,226) (1,269) (3,678) (3,807)
Net amortization 736 665 2,208 1,995
Net periodic pension cost $ 1,054 $ 942 $ 3,162 $ 2,826