Employee Benefit Plan (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Employee Benefit Plans [Line Items]
Profit Sharing and Retirement Savings Plan, expense	$ 17.9	$ 44.0	$ 40.6	$ 71.1