Employee Benefit Plan (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Employee Benefit Plans [Line Items]
Profit Sharing and Retirement Savings Plan, expense	$ 17.5	$ 26.4	$ 58.1	$ 97.5