Pension and retirement plans (Tables)

9 Months Ended

Mar. 30, 2019

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

Components of net periodic pension costs

	Third Quarters Ended				Nine Months Ended
	March 30,		March 31,		March 30,		March 31,
	2019		2018		2019		2018
	(Thousands)
Service cost	$	3,582	$	4,305	$	11,050	$	12,040
Total net periodic pension cost within selling, general and administrative expenses		3,582		4,305		11,050		12,040
Interest cost		8,010		4,529		21,238		16,095
Expected return on plan assets		(16,003)		(10,862)		(42,605)		(38,376)
Amortization of prior service credits		(392)		(393)		(1,178)		(1,179)
Recognized net actuarial loss		2,091		3,456		7,161		10,948
Total net periodic pension benefit within other income, net		(6,294)		(3,270)		(15,384)		(12,512)
Net periodic pension (benefit) cost	$	(2,712)	$	1,035	$	(4,334)	$	(472)