Income taxes (Effective Tax Rate) (Details)K	12 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jul. 01, 2023
Reconciliation between federal statutory tax rate and effective tax rate
U.S. federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes	1.30%	0.90%	0.90%
Tax on foreign income	(1.80%)	(2.10%)	0.50%
Change in valuation allowances	8.10%	0.80%	0.50%
Change in unrecognized tax benefit reserves	(4.80%)	0.10%	(0.50%)
Tax audit settlements	3.60%	0.30%	0.30%
Impact of tax attribute carryforwards	(26.20%)
Impact on foreign currency translation loss			(1.20%)
Other, net	2.90%	0.10%	0.10%
Effective Income Tax Rate	4.10%	21.10%	21.60%