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Changes in shareholders' equity - Additional Information (Details) - $ / shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Shareholders Equity [Line Items]        
Investment warrants, exercise price     $ 74.65  
Conversion of convertible notes, shares issued upon conversion 1.5 2.7 2.2 2.5
Equity Option        
Shareholders Equity [Line Items]        
Weighted average antidilutive shares which were not included in the calculation of earnings per share 5.0 5.6 5.1 5.7
Convertible Note        
Shareholders Equity [Line Items]        
Weighted average antidilutive shares which were not included in the calculation of earnings per share 1.7 3.3 2.6 3.2