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Employee Benefits - Pension (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 27, 2018	Oct. 27, 2018
Net periodic pension costs
Service cost	$ 323	$ 646
Interest cost	1,116	2,232
Expected return on plan assets	(1,136)	(2,272)
Net amortization	639	1,278
Net periodic pension cost	$ 942	$ 1,884

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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