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Pension and retirement plans (Plan Asset Allocations) (Details)
12 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jul. 02, 2022
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 7.00% 7.00% 7.00%
Return seeking investments      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations   67.00% 75.00%
Target allocation percentage of investments return seeking investments   65.00%  
Fixed Income:      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations   30.00% 24.00%
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Actual plan asset allocations   3.00% 1.00%