Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 02, 2021	Oct. 03, 2020
Components of net periodic pension costs
Service cost	$ 3,752	$ 3,938
Interest cost	3,947	3,976
Expected return on plan assets	(12,284)	(12,420)
Amortization of prior service cost	1	75
Recognized net actuarial loss	4,086	5,151
Net periodic pension (benefit) cost	(498)	720
Selling, General and Administrative Expenses
Components of net periodic pension costs
Net periodic pension (benefit) cost	3,752	3,938
Other Income, net
Components of net periodic pension costs
Net periodic pension (benefit) cost	(4,250)	$ (3,218)
Plan
Components of net periodic pension costs
Contributions	8,000
Estimated future employer pension plan contributions	$ 8,000