Income taxes - Textuals (Details) - USD ($)	12 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jun. 27, 2015
Income Tax [Line Items]
Income (loss) before income taxes, Domestic	$ (174,300,000)	$ (2,700,000)	$ 85,800,000
Income (loss) before income taxes, Foreign	$ 484,700,000	$ 480,700,000	$ 485,700,000
Effective tax rate	15.20%	18.20%	15.10%
Deferred tax assets	$ 114,350,000	$ 96,950,000
Reduction in deferred tax valuation allowance	8,800,000		$ 56,500,000
Valuation allowance impacted effective tax rate	4,000,000		8,600,000
Increase in valuation allowance for newly acquired companies and companies with a history of losses	173,500,000
Net operating loss carry forward	1,070,000,000
Operating loss carry forward, subject to expiration	17,300,000
Deferred tax assets operating loss carry forwards expiring in next three years and after	61,200,000
Operating loss carry forward, not subject to expiration	986,300,000
Unrecognized tax benefits	106,786,000	58,830,000	$ 60,433,000
Accrued interest expense and penalties	15,300,000	13,900,000
Tax contingencies settled	23,500,000
Expected cash payment for settlement	8,400,000
Provision for income taxes on unremitted earnings of foreign subsidiaries	0
Cumulative unremitted earnings of foreign subsidiaries	3,330,000,000
Fiscal Year 2016 Restructuring Liabilities | EMEA | Other Noncurrent Assets.
Income Tax [Line Items]
Deferred tax assets	$ 90,400,000	$ 98,200,000