Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012	Dec. 28, 2012	Dec. 31, 2004
Schedule of Investments [Line Items]
Shares acquired in business acquisition						10.6
Value of Other Marketable Securities and Loan Related to Other Marketable Securities	$ 244.1		$ 244.1		$ 195.1
Market price per share of other Marketable Securities and Loan Related to Other Marketable Securities	$ 24.34		$ 24.34		$ 19.45
Fees associated with the stock loan agreement	0.3	0.3	0.6	0.6
Deferred tax liability that will be due on certain hedge contract gains upon termination of our Loan Related to Other Marketable Securities	184.0		184.0		184.0
Settlement of Stock Loan					0.6
Shares outstanding on stock loan	10		10
Investments in partnerships and start-up technology companies	$ 1.6		$ 1.6		$ 1.8