Pension and retirement plans (Tables)

6 Months Ended

Dec. 29, 2018

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

Components of net periodic pension costs

	Second Quarters Ended				Six Months Ended
	December 29,		December 30,		December 29,		December 30,
	2018		2017		2018		2017
	(Thousands)
Service cost	$	3,734	$	3,867	$	7,468	$	7,735
Total net periodic pension cost within selling, general and administrative expenses		3,734		3,867		7,468		7,735
Interest cost		6,614		5,783		13,228		11,566
Expected return on plan assets		(13,301)		(13,757)		(26,602)		(27,514)
Amortization of prior service credits		(393)		(393)		(786)		(786)
Recognized net actuarial loss		2,535		3,746		5,070		7,492
Total net periodic pension benefit within other income, net		(4,545)		(4,621)		(9,090)		(9,242)
Net periodic pension benefit	$	(811)	$	(754)	$	(1,622)	$	(1,507)