Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 01, 2023	Jul. 01, 2023	Jul. 02, 2022	Jul. 03, 2021	Jun. 29, 2024
Components of net periodic pension costs
Service cost		$ 12,015	$ 15,007	$ 15,751
Interest cost		$ 26,730	$ 15,787	$ 15,904
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Expected return on plan assets		$ (48,860)	$ (49,135)	$ (49,681)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of prior service cost		$ 4	$ 4	$ 301
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Recognized net actuarial loss		$ 2,469	$ 16,343	$ 20,604
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Net loss recognized due to benefit obligation settlement	$ 37,400	$ (37,350)
Net periodic pension cost (benefit)		29,708	$ (1,994)	$ 2,879
Contributions		8,000	14,000
Settlement expenses		(37,350)
Selling, General and Administrative Expenses
Components of net periodic pension costs
Net periodic pension cost (benefit)		12,015	15,007	15,751
Other Income (Expense), net
Components of net periodic pension costs
Net periodic pension cost (benefit)		$ 17,693	$ (17,001)	$ (12,872)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Forecast
Components of net periodic pension costs
Estimated future employer pension plan contributions					$ 8,000