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Pension and retirement plans (Plan Asset Allocations) (Details)K
12 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 29, 2024
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 8.00% 7.50% 7.00%
Return seeking investments      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations   64.00% 69.00%
Target allocation percentage of investments return seeking investments   65.00%  
Fixed Income:      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations   32.00% 29.00%
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations   4.00% 2.00%