Pension and retirement plans (Tables)

3 Months Ended

Sep. 30, 2017

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

Components of net periodic pension costs

	First Quarters Ended
	September 30,		October 1,
	2017		2016 (1)
	(Thousands)
Service cost	$	3,868	$	10,848
Interest cost		5,783		3,774
Expected return on plan assets		(13,757)		(10,588)
Amortization of prior service credits		(393)		(393)
Recognized net actuarial loss		3,746		3,851
Net periodic pension (benefit) cost	$	(753)	$	7,492

⁽¹⁾ Includes discontinued operations