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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Sep. 26, 2015	Sep. 27, 2014
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	$ 391.8	$ 114.5
Convertible Notes	142.2	0.0
Convertible Notes	861.5	1,235.6
Total long-term debt obligations	3,248.0	4,153.2
Total debt obligations	3,639.8	4,267.7
Term Loan [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	74.6	0.0
Long-term debt obligations, net of debt discount	1,399.8	0.0
Revolver [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	175.0	0.0
Term Loan A [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	0.0	99.6
Long-term debt obligations, net of debt discount	0.0	796.7
Term Loan B [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	0.0	14.9
Long-term debt obligations, net of debt discount	0.0	1,120.9
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt obligations, net of debt discount	0.0	1,000.0
2022 Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt obligations, net of debt discount	$ 986.7	$ 0.0

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