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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Gross Unrecognized Tax Benefit [Line Items]        
Company's effective tax rate 20.10% 16.10% 41.90% 22.50%
Payments for Other Taxes $ 1.7      
Recognized Tax Benefit due to reversal of unrecognized tax benefit 10.9      
Provision for income taxes 15.0 $ 16.3 $ 485.4 $ 69.1
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 101.9      
Unrecognized Tax Benefits, Period Increase (Decrease) 61.7      
Unrecognized tax benefits in the next twelve months 20.2   20.2  
Non-Income Tax Loss 28.8      
Convertible Debt Securities [Member]        
Gross Unrecognized Tax Benefit [Line Items]        
Unrecognized Tax Benefits, Period Increase (Decrease) 64.0      
Settlement with Taxing Authority [Member]        
Gross Unrecognized Tax Benefit [Line Items]        
Unrecognized Tax Benefits, Period Increase (Decrease) 6.2      
Other Settlements [Member]        
Gross Unrecognized Tax Benefit [Line Items]        
Unrecognized Tax Benefits, Period Increase (Decrease) 8.5      
General and administrative        
Gross Unrecognized Tax Benefit [Line Items]        
Gain from income tax settlement $ 12.4   $ 12.4