Reconciliation for Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 29, 2013
Debt Security
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 49.7
Additions/Purchases	6.4	[1]
Settlements		[2]
Change in fair value
Ending balance	56.1
Contingent Consideration
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(8.8)
Additions/Purchases		[1]
Settlements	0.6	[2]
Change in fair value	0.3
Ending balance	(7.9)
Option to Purchase a Company
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	1.4
Settlements		[2]
Change in fair value
Ending balance	$ 1.4

[1] Amounts reported under "Contingent Consideration" represent additions to contingent consideration liabilities as a result of acquisitions of businesses.

[2] Amounts reported under "Contingent Consideration" represent cash payments to settle contingent consideration liabilities.