Income taxes (Effective Tax Rate) (Details) - USD ($) $ in Millions		12 Months Ended
Jan. 01, 2018	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Reconciliation between federal statutory tax rate and effective tax rate
U.S. federal statutory rate	21.00%	21.00%	28.00%	35.00%
State and local income taxes, net of federal benefit		0.30%	(6.10%)	(1.70%)
Tax on foreign income, net of valuation allowances		(0.50%)	(23.50%)	(23.50%)
Establishment/(release) of valuation allowance, net of U.S. tax expense		(3.20%)	(0.10%)	1.30%
Change in unrecognized tax benefit reserves		17.90%	(7.40%)	3.60%
Tax audit settlements		0.90%	4.50%	0.10%
Impact of the Act - transition tax		0.071	1.585
Impact of the Act - deferred tax effects		(5.60%)	4.20%
Impairment of investments, including goodwill		(8.00%)	35.10%
Other, net		(4.20%)	5.30%	0.40%
Effective Income Tax Rate - continuing operations		25.70%	198.50%	15.20%
Tax benefit due to lower tax jurisdictions		$ (34.1)

The amount of current income tax expense (benefit) that is due to lower tax jurisdictions.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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