The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 06, 2012	Jul. 21, 2012	Oct. 06, 2012 Other Current Assets	Dec. 31, 2011 Other Current Assets	Oct. 06, 2012 Other Current Liabilities	Oct. 06, 2012 Senior Notes	Mar. 28, 2012 Senior Notes	Oct. 06, 2012 Interest Rate Contracts ButterKrust	Aug. 01, 2008 Interest Rate Contracts ButterKrust	Aug. 01, 2008 Interest Rate Contracts Holsum
Derivative Instruments, Gain (Loss) [Line Items]
Commodity derivatives fair value, net	$ 5.6
Notional amount of interest rate swap								67.5	85.0	65.0
Term loan outstanding	150.0	20.0
Interest rate						4.375%	4.375%
Fair value of interest rate swaps	(1.4)
Cash settlement on hedge	3.1
Derivative instrument, asset			2.1	11.8
Derivative instrument, liability					$ 2.0