Pension and retirement plans (Pension Plans) (Details) $ in Thousands		12 Months Ended
	Jul. 03, 2022 USD ($)	Jul. 02, 2022 USD ($) item	Jul. 03, 2021 USD ($)	Jun. 27, 2020 USD ($)
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	$ 614,359	$ 762,708	$ 790,179
Service cost		15,007	15,751	$ 15,145
Interest cost		15,787	15,904	22,552
Actuarial gain		(138,899)	(12,397)
Benefits paid		(40,244)	(46,729)
Benefit obligations at end of year		614,359	762,708	790,179
Change in plan assets:
Fair value of plan assets at beginning of year	$ 638,894	772,279	707,800
Actual return on plan assets		(107,141)	95,208
Benefits paid		(40,244)	(46,729)
Contributions		14,000	16,000
Fair value of plan assets at end of year		638,894	772,279	$ 707,800
Funded status of the plan recognized as a non-current asset		24,535	9,571
Amounts recognized in accumulated other comprehensive income:
Unrecognized net actuarial losses		178,984	177,949
Unamortized prior service cost		27	31
Amount recognized in accumulated other comprehensive income		179,011	177,980
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial (gain) loss		17,378	(57,924)
Amortization of net actuarial losses		(16,343)	(20,604)
Amortization of prior service costs		(4)	(301)
Other changes in plan assets and benefit obligations recognized in other comprehensive income		1,031	$ (78,829)
Unrecognized actuarial losses expected to be recognized in net periodic pension cost during following year		$ 2,800
Weighted average assumptions used to calculate actuarial present values of benefit obligations
Discount rate		4.80%	2.80%
Weighted average assumptions used to determine net benefit costs
Discount rate		2.50%	2.40%
Expected return on plan assets	7.00%	7.00%	7.40%
Rate of compensation increase		3.50%	3.50%
Interest crediting rate		4.00%	4.00%