Pension and retirement plans (Pension Plans) (Details) $ in Thousands	12 Months Ended
	Jun. 29, 2024 USD ($)	Jul. 01, 2023 USD ($) item	Jul. 02, 2022 USD ($)	Jul. 03, 2021 USD ($)
Changes in benefit obligations:
The minimum hours that must be worked in a year, in order that the employee becomes eligible to join the pension plan in the following year. | item		1,000
Benefit obligations at beginning of year	$ 471,401	$ 614,359	$ 762,708
Service cost		12,015	15,007	$ 15,751
Interest cost		26,730	15,787	15,904
Actuarial gain		(43,407)	(138,899)
Benefits paid		(21,785)	(40,244)
Settlements paid		116,511
Benefit obligations at end of year		471,401	614,359	762,708
Change in plan assets:
Fair value of plan assets at beginning of year	$ 504,348	638,894	772,279
Actual return on plan assets		(4,250)	(107,141)
Benefits paid		(21,785)	(40,244)
Settlements paid		(116,511)
Contributions		8,000	14,000
Fair value of plan assets at end of year		504,348	638,894	$ 772,279
Funded status of the plan recognized as a non-current asset		32,947	24,535
Amounts recognized in accumulated other comprehensive income:
Unrecognized net actuarial losses		148,867	178,984
Unamortized prior service cost		23	27
Amount recognized in accumulated other comprehensive income		148,890	179,011
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial loss		9,702	17,378
Amortization of net actuarial losses		(2,469)	(16,343)
Amortization of prior service costs		(4)	(4)
Defined Benefit Plan Settlements Benefit Obligation		37,350
Other changes in plan assets and benefit obligations recognized in other comprehensive income		(30,121)	$ 1,031
Unrecognized actuarial losses expected to be recognized in net periodic pension cost during following year		200
Settlement expenses		$ 37,350
Weighted average assumptions used to calculate actuarial present values of benefit obligations
Discount rate		5.40%	4.80%
Weighted average assumptions used to determine net benefit costs
Discount rate		4.60%	2.50%
Expected return on plan assets	7.00%	7.00%	7.00%
Rate of compensation increase		3.50%	3.50%
Interest crediting rate		4.00%	4.00%