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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2017
Mar. 26, 2016
Apr. 01, 2017
Mar. 26, 2016
Gross Unrecognized Tax Benefit [Line Items]        
Company's effective tax rate 45.60% 25.00% 43.40% 25.50%
Payments for Other Taxes $ 1.7      
Recognized Tax Benefit due to reversal of unrecognized tax benefit 10.9      
Provision for income taxes 440.8 $ 23.0 $ 470.4 $ 52.8
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 104.0      
Unrecognized Tax Benefits, Period Increase (Decrease) 59.6      
Unrecognized tax benefits in the next twelve months 21.0   $ 21.0  
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) $ 10.6