Income taxes - Textuals (Details) - USD ($)	12 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 29, 2013
Income taxes
Income (loss) before income taxes, Domestic	$ 180,600,000	$ 235,400,000	$ 174,000,000
Income (loss) before income taxes, Foreign	$ 532,300,000	$ 465,700,000	$ 375,300,000
Effective tax rate	19.80%	22.20%	18.10%
Net tax benefit impacting tax rate	$ 55,100,000
Tax benefit release of valuation allowance against deferred tax assets	51,600,000
Foreign income tax expense (benefit)	16,200,000
Income tax expense related to valuation allowances	7,600,000
Reduction in deferred tax valuation allowance	93,900,000
Valuation allowance impacted effective tax rate	51,600,000
Increase in valuation allowance for newly acquired companies and companies with a history of losses	33,100,000
Net Expense related to valuation allowance in various foreign jusidictions	23,200,000
Net operating loss carry forward	932,800,000
Operating loss carry forward, subject to expiration	21,100,000
Deferred tax assets operating loss carry forwards expiring in next three years and after	204,200,000
Operating loss carry forward, not subject to expiration	707,500,000
Unrecognized tax benefits	103,923,000	$ 128,221,000	$ 123,930,000
Recognized tax benefits	69,000,000	112,200,000
Accrued interest expense and penalties	22,600,000	$ 25,300,000
Tax contingencies settled	18,100,000
Expected cash payment for settlement	3,000,000
Provision for income taxes on unremitted earnings of foreign subsidiaries	0
Cumulative unremitted earnings of foreign subsidiaries	$ 3,060,000,000