Effective Portion of Foreign Currency Forward Contracts Designated as Cash Flow Hedges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Foreign Exchange Contracts
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	$ 1.4	$ (0.5)	$ 0.4
Revenues
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Net Earnings (Effective Portion)	$ 0.6	$ (1.0)	$ 0.9