Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Mar. 28, 2026	Mar. 29, 2025
Components of net periodic pension costs
Service cost within selling, general and administrative expenses	$ 2,718	$ 2,870	$ 8,155	$ 8,610
Interest cost	5,742	6,183	17,225	18,549
Expected return on plan assets	(10,553)	(10,438)	(31,659)	(31,315)
Recognized net actuarial loss and other	2,841	1,286	8,523	3,859
Net periodic pension cost (benefit)	748	(99)	2,244	(297)
Other Income, net
Components of net periodic pension costs
Net periodic pension cost (benefit)	(1,970)	$ (2,969)	(5,911)	$ (8,907)
Plan
Components of net periodic pension costs
Contributions			6,000
Estimated future employer pension plan contributions	$ 2,000		$ 2,000