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Share-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 27, 2015
Jun. 28, 2014
Jun. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available to be granted 5,000      
Share-based compensation $ 24,800 $ 31,600 $ 24,600 $ 18,400
Unrecognized share-based compensation expense $ 52,100      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning options outstanding, number of options 857 850    
Granted, number of options 0 181    
Exercised, number of options (72) (170)    
Forfeited or expired, number of options (2) (4)    
Ending options outstanding, number of options 783 857 850  
Beginning options outstanding, weighted average exercise price $ 97.49 $ 77.26    
Granted, weighted average exercise price 0.00 147.75    
Exercised, weighted average exercise price 69.62 49.26    
Forfeited or expired, weighted average exercise price 131.91 128.76    
Ending options outstanding, weighted average exercise price $ 99.93 $ 97.49 $ 77.26  
Options exercisable, number of options 614      
Options expected to vest, number of options 165      
Options exercisable, weighted average exercise price $ 89.08      
Options expected to vest, weighted average exercise price $ 139.21      
Options expected to vest, weighted average remaining term in years   8 years 4 months 24 days    
Options outstanding, aggregate intrinsic value $ 35,600 $ 79,800    
Options exercisable, aggregate intrinsic value 34,300      
Options expected to vest, aggregate intrinsic value 1,300      
Options exercised, aggregate intrinsic value $ 6,700 $ 20,700 $ 17,800 $ 29,500
Options granted, weighted average grant date fair value   $ 39.96 $ 38.28 $ 34.24
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Dividend yield   0.30% 0.30% 0.30%
Volatility, as a percent   27.10% 32.70% 34.90%
Risk-free interest rate   1.70% 1.80% 0.80%
Expected life in years after vest date   5 years 3 months 24 days 5 years 3 months 24 days 5 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   6 years 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   5 years 4 months 24 days    
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year    
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   10 years    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning non-vested shares/units outstanding, number of shares/units 0 9    
Granted, number of shares/units 0 0    
Vested, number of shares/units 0 (9)    
Cancelled, number of shares/units 0 0    
Ending non-vested shares/units outstanding, number of shares/units 0 0 9  
Beginning non-vested shares/units, weighted average grant date fair value $ 0.00 $ 100.84    
Granted, weighted average grant date fair value 0.00 0.00 $ 145.19 $ 100.84
Vested, weighted average grant date fair value 0.00 100.84    
Cancelled, weighted average grant date fair value 0.00 0.00    
Ending non-vested shares/units, weighted average grant date fair value $ 0.00 $ 0.00 $ 100.84  
Non-vested shares/units, weighted average remaining term in years 0 years 0 days    
Non-vested shares/units, aggregate intrinsic value $ 0 $ 0    
Vested, total fair value   $ 900 $ 2,300 $ 600
Service-based Restricted Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning non-vested shares/units outstanding, number of shares/units 283 247    
Granted, number of shares/units 199 135    
Vested, number of shares/units (94) (91)    
Cancelled, number of shares/units (6) (8)    
Ending non-vested shares/units outstanding, number of shares/units 382 283 247  
Beginning non-vested shares/units, weighted average grant date fair value $ 136.48 $ 112.89    
Granted, weighted average grant date fair value 165.64 153.99 $ 133.08 $ 109.20
Vested, weighted average grant date fair value 125.03 99.54    
Cancelled, weighted average grant date fair value 164.56 126.13    
Ending non-vested shares/units, weighted average grant date fair value $ 154.07 $ 136.48 $ 112.89  
Non-vested shares/units, weighted average remaining term in years   1 year 2 months 12 days    
Non-vested shares/units, aggregate intrinsic value $ 55,300 $ 53,900    
Vested, total fair value $ 11,700 $ 9,100 $ 6,800 $ 5,700
Performance-based Restricted Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning non-vested shares/units outstanding, number of shares/units 229 182    
Granted, number of shares/units 55 106    
Vested, number of shares/units (58) (56)    
Cancelled, number of shares/units (3) (3)    
Ending non-vested shares/units outstanding, number of shares/units 223 229 182  
Beginning non-vested shares/units, weighted average grant date fair value $ 129.77 $ 109.63    
Granted, weighted average grant date fair value 184.49 150.14 $ 119.85 $ 108.60
Vested, weighted average grant date fair value 109.20 91.14    
Cancelled, weighted average grant date fair value 144.73 126.96    
Ending non-vested shares/units, weighted average grant date fair value $ 146.31 $ 129.77 $ 109.63  
Non-vested shares/units, weighted average remaining term in years   1 year 4 months 17 days    
Non-vested shares/units, aggregate intrinsic value $ 32,300 $ 43,600    
Vested, total fair value $ 6,400 $ 5,100 $ 4,600 $ 5,000