Income taxes (Effective Tax Rate) (Details)	12 Months Ended
Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Reconciliation between federal statutory tax rate and effective tax rate
U.S. federal statutory rate	21.00%	21.00%	28.00%
State and local income taxes, net of federal benefit	4.70%	0.30%	(6.10%)
Tax on foreign income, net of valuation allowances	5.10%	(0.50%)	(23.50%)
Establishment/release of valuation allowance, net of U.S. tax expense	(28.90%)	(3.20%)	(0.10%)
Change in unrecognized tax benefit reserves	20.30%	17.90%	(7.40%)
Tax audit settlements	(5.60%)	0.90%	4.50%
Impact of the Act - transition tax		0.071	1.585
Impact of the Act - deferred tax effects		(5.60%)	4.20%
Impact of the CARES Act	10.30%
Impairment of investments, including goodwill	57.10%	(8.00%)	35.10%
Other, net	(7.10%)	(4.20%)	5.30%
Effective Income Tax Rate - continuing operations	76.90%	25.70%	198.50%

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