Pension and retirement plans (Tables)

3 Months Ended

Oct. 03, 2015

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

Components of net periodic pension costs

	First Quarters Ended
	October 3,		September 27,
	2015		2014
	(Thousands)
Service cost	$	10,486	$	9,873
Interest cost		5,328		4,449
Expected return on plan assets		(10,071)		(9,055)
Recognized net actuarial loss		3,183		3,251
Amortization of prior service credits		(393)		(393)
Net periodic pension cost	$	8,533	$	8,125