Pension and retirement plans (Tables)

6 Months Ended

Dec. 28, 2019

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

Components of net periodic pension costs

	Second Quarters Ended				Six Months Ended
	December 28,		December 29,		December 28,		December 29,
	2019		2018		2019		2018
	(Thousands)
Service cost	$	3,786	$	3,734	$	7,572	$	7,468
Total net periodic pension cost within selling, general and administrative expenses		3,786		3,734		7,572		7,468
Interest cost		5,638		6,614		11,276		13,228
Expected return on plan assets		(12,667)		(13,301)		(25,335)		(26,602)
Amortization of prior service cost (credit)		535		(393)		1,069		(786)
Recognized net actuarial loss		3,677		2,535		7,314		5,070
Total net periodic pension benefit within other (expense) income, net		(2,817)		(4,545)		(5,676)		(9,090)
Net periodic pension cost (benefit)	$	969	$	(811)	$	1,896	$	(1,622)