Pension and retirement plans (Pension Plans) (Details)K - USD ($) $ in Thousands	12 Months Ended
	Jun. 27, 2026	Jun. 28, 2025	Jun. 29, 2024	Jul. 01, 2023
Changes in benefit obligations:
Benefit obligations at beginning of year	$ 473,980	$ 470,843	$ 471,401
Service cost within selling, general and administrative expenses		11,480	10,252	$ 12,015
Interest cost		24,732	24,579	26,730
Actuarial loss		11,292	1,202
Benefits paid		(44,367)	(36,591)
Benefit obligations at end of year		473,980	470,843	471,401
Change in plan assets:
Fair value of plan assets at beginning of year	$ 477,558	480,705	504,348
Actual return on plan assets		33,220	4,948
Benefits paid		(44,367)	(36,591)
Contributions		8,000	8,000
Fair value of plan assets at end of year		477,558	480,705	$ 504,348
Funded status of the plan recognized as a non-current asset		3,578	9,862
Amounts recognized in accumulated other comprehensive income:
Unrecognized net actuarial losses		199,856	185,284
Unamortized prior service cost		16	20
Amount recognized in accumulated other comprehensive income		199,872	185,304
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial loss		17,584	36,195
Amortization of net actuarial losses		(5,222)	(222)
Amortization of prior service costs		(4)	(4)
Other changes in plan assets and benefit obligations recognized in other comprehensive income		(12,358)	$ (35,969)
Unrecognized actuarial losses expected to be recognized in net periodic pension cost during following year		$ 11,400
Weighted average assumptions used to calculate actuarial present values of benefit obligations
Discount rate		5.50%	5.50%
Weighted average assumptions used to determine net benefit costs
Discount rate		5.50%	5.40%
Expected return on plan assets	8.00%	7.50%	7.00%
Rate of compensation increase		3.50%	3.50%
Interest crediting rate		4.30%	4.00%