Stock Rights (Details) (USD $)	12 Months Ended
	Dec. 29, 2012
Stock Rights [Abstract]
Stock rights outstanding (in shares)	6,219,749
Stock rights, exercise price (in dollars per share)	$ 80
Period after which rights become exercisable upon acquisition of 10 percent or more of common stock	10 days
Threshold percentage of common stock to be acquired for rights to become exercisable (in hundredths)	10.00%
Stock rights, expiration date	Jul. 23, 2018
Stock rights, redemption price per share (in dollars per share)	$ 0.01
Ratio of market value of common stock of surviving company to current exercise price of rights in the event of acquisition	2