Pension and retirement plans (Fair Value) (Details) - USD ($) $ in Thousands	Jul. 02, 2022	Jul. 03, 2021	Jun. 27, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 638,894	$ 772,279	$ 707,800
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,283	16,655
Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	219,407	290,347
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149,975	124,363
High yield credit and bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109,253	117,722
U.S. government agencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122,912	186,279
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32,064	36,913
Level 1 | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,283	16,655
Level 1 | Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,283	16,655
Net Asset Value | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	633,611	755,624
Net Asset Value | Recurring | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	219,407	290,347
Net Asset Value | Recurring | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149,975	124,363
Net Asset Value | Recurring | High yield credit and bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	109,253	117,722
Net Asset Value | Recurring | U.S. government agencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122,912	186,279
Net Asset Value | Recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 32,064	$ 36,913