Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Components of net periodic pension costs
Service cost	$ 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
Net periodic pension (benefit) cost	(2,712)	1,035	(4,334)	(472)
Selling, General and Administrative Expenses
Components of net periodic pension costs
Net periodic pension (benefit) cost	3,582	4,305	11,050	12,040
Other Income, net
Components of net periodic pension costs
Net periodic pension (benefit) cost	(6,294)	(3,270)	(15,384)	(12,512)
Plan
Components of net periodic pension costs
Pension settlement charge		$ 4,900		$ 18,900
Contributions			8,000
Estimated future employer pension plan contributions	$ 8,000		$ 8,000