Income taxes - Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Income Tax [Line Items]
Income (loss) before income taxes, Domestic	$ (385,100)	$ (174,300)	$ (2,700)
Income (loss) before income taxes, Foreign	$ 530,200	$ 484,700	$ 480,700
Effective tax rate	198.50%	15.20%	18.20%
Deferred tax assets	$ 130,675	$ 114,350
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	4,000
Net operating loss carry forward	1,230,000
Operating loss carry forward, subject to expiration	40,000
Deferred tax assets operating loss carry forwards expiring in next three years and after	87,200
Operating loss carry forward, not subject to expiration	1,100,000
Unrecognized tax benefits	106,604	106,786	$ 58,830
Accrued interest expense and penalties	22,200	15,300
Tax contingencies settled	35,800
Expected cash payment for settlement	9,900
Other Noncurrent Assets.
Income Tax [Line Items]
Deferred tax assets	$ 70,100	$ 90,400