Reconciliation for Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 28, 2013
Corporate Debt Security
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 49.7
Additions/Purchases	9.8
Settlements		[1]
Change in fair value
Ending balance	59.5
Option to Purchase a Company
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	1.4
Additions/Purchases
Settlements		[1]
Change in fair value
Ending balance	1.4
Contingent Consideration
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(8.8)
Settlements	0.9	[1]
Change in fair value	0.3
Ending balance	$ (7.6)

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