Reconciliation for Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 27, 2013
Corporate Debt Security
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 49.7
Additions, including accrued interest	13.0
Settlements	0	[1]
Change in fair value recognized in earnings	0
Ending balance	62.7
Contingent Consideration
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(8.8)
Additions, including accrued interest	0
Settlements	1.1	[1]
Change in fair value recognized in earnings	5.2
Ending balance	(2.5)
Option to Purchase a Company
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	1.4
Additions, including accrued interest	0
Settlements	0	[1]
Change in fair value recognized in earnings	0
Ending balance	$ 1.4

[1] Amounts reported under “Contingent Consideration” represent cash payments to settle contingent consideration liabilities.