Income taxes - Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Income Tax [Line Items]
Loss before income taxes, Domestic	$ 68,500	$ 385,100	$ 174,300
Income before income taxes, Foreign	$ 310,800	$ 530,200	$ 484,700
Effective tax rate	25.70%	198.50%	15.20%
Deferred tax assets	$ 90,714	$ 130,675
Reduction in deferred tax valuation allowance			$ 8,800
Valuation allowance impacted effective tax rate			$ 4,000
Decrease in valuation allowance due to expiring losses with a related valuation allowance	5,300
Net operating loss carry forward	1,270,000
Operating loss carry forward, subject to expiration	38,400
Deferred tax assets operating loss carry forwards expiring in next three years and after	228,400
Operating loss carry forward, not subject to expiration	999,000
Unrecognized tax benefits including interest and penalties	147,200
Accrued interest expense and penalties	23,400	22,200
Tax contingencies settled	38,100
Expected cash payment for settlement	$ 12,300
Other Noncurrent Assets.
Income Tax [Line Items]
Deferred tax assets		$ 70,100