Pension and retirement plans (Fair Value) (Details)K - USD ($) $ in Thousands	Jun. 28, 2025	Jun. 29, 2024	Jul. 01, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 477,558	$ 480,705	$ 504,348
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,880	8,586
Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	147,890	151,936
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74,747	95,974
High yield credit and bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84,857	85,064
U.S. government agencies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	113,401	102,542
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	38,783	36,603
Level 1 | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,880	8,586
Level 1 | Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,880	8,586
Net Asset Value | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	459,678	472,119
Net Asset Value | Recurring | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	147,890	151,936
Net Asset Value | Recurring | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74,747	95,974
Net Asset Value | Recurring | High yield credit and bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84,857	85,064
Net Asset Value | Recurring | U.S. government agencies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	113,401	102,542
Net Asset Value | Recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 38,783	$ 36,603