Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 27, 2025	Sep. 28, 2024
Components of net periodic pension costs
Service cost within selling, general and administrative expenses	$ 2,718	$ 2,870
Interest cost	5,742	6,183
Expected return on plan assets	(10,553)	(10,438)
Recognized net actuarial loss and other	2,841	1,286
Net periodic pension cost (benefit)	748	(99)
Other Income, net
Components of net periodic pension costs
Net periodic pension cost (benefit)	(1,970)	$ (2,969)
Plan
Components of net periodic pension costs
Contributions	4,000
Estimated future employer pension plan contributions	$ 4,000