Pension and retirement plans (Tables)

9 Months Ended

Mar. 31, 2018

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

Components of net periodic pension costs

	Third Quarters Ended				Nine Months Ended
	March 31,		April 1,		March 31,		April 1,
	2018		2017 (1)		2018		2017 (1)
	(Thousands)
Service cost	$	4,305	$	7,406	$	12,040	$	22,217
Interest cost		4,529		3,952		16,095		11,856
Expected return on plan assets		(10,862)		(10,840)		(38,376)		(32,520)
Amortization of prior service credits		(393)		(394)		(1,179)		(1,180)
Recognized net actuarial loss		3,456		3,610		10,948		10,830
Pension settlement charge		4,875		—		18,859		—
Net periodic pension cost	$	5,910	$	3,734	$	18,387	$	11,203

⁽¹⁾ Includes discontinued operations