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Pension Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Net periodic pension costs    
Service cost $ 329 $ 319
Interest cost 1,147 1,170
Expected return on plan assets (1,204) (1,245)
Net amortization 780 764
Net periodic pension cost $ 1,052 $ 1,008