Pension and retirement plans (Tables)

3 Months Ended

Oct. 01, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of net periodic pension costs

	First Quarters Ended
	October 1,		October 3,
	2016		2015
	(Thousands)
Service cost	$	10,848	$	10,486
Interest cost		3,774		5,328
Expected return on plan assets		(10,588)		(10,071)
Recognized net actuarial loss		3,851		3,183
Amortization of prior service credits		(393)		(393)
Net periodic pension cost	$	7,492	$	8,533