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Borrowings and Credit Arrangements - Company's Borrowings (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 27, 2014
Sep. 28, 2013
Debt Instrument [Line Items]    
Current debt obligations, net of debt discount $ 114.5 $ 563.8
Convertible Notes 0 400.1
Convertible Notes 1,235.6 1,188.0
Total long-term debt obligations 4,153.2 4,242.1
Total debt obligations 4,267.7 4,805.9
Term Loan A [Member]
   
Debt Instrument [Line Items]    
Current debt obligations, net of debt discount 99.6 49.7
Long-term debt obligations, net of debt discount 796.7 894.8
Term Loan B [Member]
   
Debt Instrument [Line Items]    
Current debt obligations, net of debt discount 14.9 114.0
Long-term debt obligations, net of debt discount 1,120.9 1,159.3
Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long-term debt obligations, net of debt discount $ 1,000.0 $ 1,000.0