Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2024	Apr. 01, 2023	Mar. 30, 2024	Apr. 01, 2023
Components of net periodic pension costs
Service cost within selling, general and administrative expenses	$ 2,563	$ 3,003	$ 7,689	$ 9,011
Interest cost	6,145	6,682	18,434	20,047
Expected return on plan assets	(9,986)	(12,215)	(29,956)	(36,645)
Amortization of prior service cost	1	1	3	3
Recognized net actuarial loss	56	617	167	1,852
Net periodic pension cost (benefit)	(1,221)	(1,912)	(3,663)	(5,732)
Other Income, net
Components of net periodic pension costs
Net periodic pension cost (benefit)	(3,784)	$ (4,915)	(11,352)	$ (14,743)
Plan
Components of net periodic pension costs
Contributions			6,000
Estimated future employer pension plan contributions	$ 2,000		$ 2,000