Derivative Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended											12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Jul. 21, 2012	Dec. 29, 2012 Other Current Assets	Dec. 31, 2011 Other Current Assets	Dec. 29, 2012 4.375% Senior Notes	Mar. 28, 2012 4.375% Senior Notes	Dec. 29, 2012 Interest Rate Contracts ButterKrust	Aug. 01, 2008 Interest Rate Contracts ButterKrust	Aug. 01, 2008 Interest Rate Contracts Holsum	Dec. 29, 2012 Interest rate swap derivatives	Dec. 31, 2011 Interest rate swap derivatives	Jan. 01, 2011 Interest rate swap derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Commodity derivatives fair value, net	$ (3,200,000)	$ (5,700,000)
Interest rate							4.375%	4.375%
Cash settlement on hedge	3,100,000
Notional amount of interest rate swap									67,500,000	85,000,000	65,000,000
Term loan outstanding	150,000,000			20,000,000
Fair value of interest rate swaps	(900,000)	(3,400,000)
Interest expense	23,411,000	10,172,000	8,164,000									2,800,000	4,000,000	4,600,000
Derivative instrument, asset					$ 9,000,000	$ 11,800,000