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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Aug. 01, 2015	Jun. 27, 2015	Sep. 27, 2014
Debt Instrument [Line Items]
Current debt obligations, net of debt discount		$ 671.5	$ 114.5
Convertible Notes Payable, Current		421.8	0.0
Convertible Notes		852.7	1,235.6
Total long-term debt obligations		3,270.8	4,153.2
Total debt obligations		3,942.3	4,267.7
Term Loan [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount		74.7	0.0
Long-term debt obligations, net of debt discount		1,418.1	0.0
Revolver [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount		175.0	0.0
Term Loan A
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
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
Debt Instrument [Line Items]
Long-term debt obligations, net of debt discount	$ 1,000.0	$ 1,000.0	$ 1,000.0

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