Pension and retirement plans (Fair Value) (Details) - USD ($) $ in Thousands	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 480,705	$ 504,348	$ 638,894
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,586	15,389
Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	151,936	138,533
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	95,974	108,936
High yield credit and bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	85,064	90,767
U.S. government agencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102,542	118,456
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36,603	32,267
Level 1 | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,586	15,389
Level 1 | Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,586	15,389
Net Asset Value | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	472,119	488,959
Net Asset Value | Recurring | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	151,936	138,533
Net Asset Value | Recurring | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	95,974	108,936
Net Asset Value | Recurring | High yield credit and bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	85,064	90,767
Net Asset Value | Recurring | U.S. government agencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102,542	118,456
Net Asset Value | Recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 36,603	$ 32,267