Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jun. 29, 2019	Jul. 02, 2022
Components of net periodic pension costs
Service cost	$ 15,751	$ 15,145	$ 14,631
Interest cost	15,904	22,552	26,354
Expected return on plan assets	(49,681)	(50,671)	(53,518)
Amortization of prior service cost (credits)	301	2,137	(1,571)
Recognized net actuarial loss	20,604	14,629	9,251
Net periodic pension cost	2,879	3,792	(4,853)
Contributions	16,000	8,000
Selling, General and Administrative Expenses
Components of net periodic pension costs
Net periodic pension cost	15,751	15,145	14,631
Other Income, net
Components of net periodic pension costs
Net periodic pension cost	$ (12,872)	$ (11,353)	$ (19,484)
Forecast
Components of net periodic pension costs
Estimated future employer pension plan contributions				$ 16,000