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Income taxes - Textuals (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 30, 2018
Income taxes      
Loss before income taxes, Domestic $ 253,300 $ 68,500 $ 385,100
Income before income taxes, Foreign $ 125,200 $ 310,800 $ 530,200
Effective tax rate 76.90% 25.70% 198.50%
Deferred tax assets $ 187,553 $ 90,714  
Decrease in valuation allowance due to expiring losses with a related valuation allowance 61,400    
Net operating loss carry forward 1,280,000    
Operating loss carry forward, subject to expiration 33,400    
Deferred tax assets operating loss carry forwards expiring in next three years and after 246,300    
Operating loss carry forward, not subject to expiration 999,100    
Unrecognized tax benefits including interest and penalties 116,500    
Accrued interest expense and penalties 20,200 $ 23,400  
Tax contingencies settled 16,100    
Expected cash payment for settlement $ 1,700