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Share Plans (Schedule of Performance Share Unit Activity) (Details) - Performance Shares - $ / shares
12 Months Ended
Sep. 30, 2016
Sep. 25, 2015
Sep. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period to recognize unrecognized compensation cost, share options 1 year 8 months    
Performance Share Unit Activity [Roll Forward]      
Beginning balance [1] 130,974 72,740  
Granted [1] 145,192 77,306  
Forfeited [1] (9,521) (19,072)  
Ending balance [1] 266,645 130,974  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, restricted share units $ 88.59 $ 96.05 $ 63.46
Weighted-average grant date fair value, granted restricted share units 83.00 125.84  
Weighted-average grant date fair value, forfeited restricted share units $ 96.30 $ 92.05  
[1] The number of shares disclosed within this table are at the target number of 100%.