Pension and retirement plans (Periodic Pension Cost) (Details)QK - USD ($) $ in Thousands	12 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jul. 01, 2023	Jun. 27, 2026
Components of net periodic pension costs
Service cost within selling, general and administrative expenses	$ 11,480	$ 10,252	$ 12,015
Interest cost	$ 24,732	$ 24,579	$ 26,730
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	$ (41,721)	$ (39,941)	$ (48,860)
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)
Recognized net actuarial loss	$ 5,226	$ 227	$ 2,473
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)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ (37,350)
Total net periodic pension benefit within other expense, net	$ (11,763)	$ (15,135)	17,693
Net periodic pension benefit	$ (283)	$ (4,883)	$ 29,708
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)
Contributions	$ 8,000	$ 8,000
Forecast
Components of net periodic pension costs
Estimated future employer pension plan contributions				$ 8,000