Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 28, 2024	Dec. 30, 2023
Components of net periodic pension costs
Service cost within selling, general and administrative expenses	$ 2,870	$ 2,563	$ 5,740	$ 5,126
Interest cost	6,183	6,144	12,366	12,289
Expected return on plan assets	(10,439)	(9,985)	(20,877)	(19,970)
Recognized net actuarial loss and other	1,287	56	2,573	113
Net periodic pension benefit	(99)	(1,222)	(198)	(2,442)
Other Income, net
Components of net periodic pension costs
Net periodic pension benefit	(2,969)	$ (3,785)	(5,938)	$ (7,568)
Plan
Components of net periodic pension costs
Contributions			4,000
Estimated future employer pension plan contributions	$ 4,000		$ 4,000