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Summary of Significant Accounting Policies - Changes in accumulated balances of other comprehensive income (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (15.7) $ (4.7) $ 8.6
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 6.9 8.9 12.1
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 1.8 1.6 0.3
Accumulated other comprehensive Income Loss Hedge (3.9) 0.0  
Accumulated Other Comprehensive Income (Loss), Net of Tax (14.5) 2.6 20.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent (20.6) (13.3) 1.4
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 9.8 3.2 (12.1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent 0.2 1.3 (0.1)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (3.9) 0.0 $ 0.0
Other Comprehensive Income (Loss), before Reclassifications, before Tax (34.5) (17.8)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 17.4 0.0  
Foreign Currency Gain (Loss) [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent (20.6)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 9.6 0.0  
Equity Securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 7.8 0.0  
Pension in Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent 0.2 1.3  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 $ 0.0  
Interest Rate Cap [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ 0.0