Fair Value of Other Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 29, 2012	Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Bank deposits (included in "Cash and cash equivalents")	$ 611.9	$ 564.3
Short-term borrowings	(168.8)	(181.4)
Long-term debt	(6.9)	(17.2)
Quoted Prices in Active Markets for Identical Instruments (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Bank deposits (included in "Cash and cash equivalents")	611.9	564.3
Short-term borrowings	0	0
Long-term debt	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Bank deposits (included in "Cash and cash equivalents")	0	0
Short-term borrowings	(168.8)	(181.4)
Long-term debt	(6.9)	(17.2)
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Bank deposits (included in "Cash and cash equivalents")	0	0
Short-term borrowings	0	0
Long-term debt	$ 0	$ 0