Pension and retirement plans (Pension Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022
Changes in benefit obligations:
Benefit obligations at beginning of year	$ 470,843	$ 471,401	$ 614,359
Service cost within selling, general and administrative expenses		10,252	12,015	$ 15,007
Interest cost		24,579	26,730	15,787
Actuarial loss (gain)		1,202	(43,407)
Benefits paid		(36,591)	(21,785)
Settlements paid			116,511
Benefit obligations at end of year		470,843	471,401	614,359
Change in plan assets:
Fair value of plan assets at beginning of year	$ 480,705	504,348	638,894
Actual return on plan assets		4,948	(4,250)
Benefits paid		(36,591)	(21,785)
Settlements paid			(116,511)
Contributions		8,000	8,000
Fair value of plan assets at end of year		480,705	504,348	$ 638,894
Funded status of the plan recognized as a non-current asset		9,862	32,947
Amounts recognized in accumulated other comprehensive income:
Unrecognized net actuarial losses		185,284	148,867
Unamortized prior service cost		20	23
Amount recognized in accumulated other comprehensive income		185,304	148,890
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial loss		36,195	9,702
Amortization of net actuarial losses		(222)	(2,469)
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		(35,969)	30,121
Unrecognized actuarial losses expected to be recognized in net periodic pension cost during following year		$ 5,100
Settlement expenses			$ 37,350
Weighted average assumptions used to calculate actuarial present values of benefit obligations
Discount rate		5.50%	5.40%
Weighted average assumptions used to determine net benefit costs
Discount rate		5.40%	4.60%
Expected return on plan assets	7.50%	7.00%	7.00%
Rate of compensation increase		3.50%	3.50%
Interest crediting rate		4.00%	4.00%