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Derivative Financial Instruments - Additional Information (Detail) (USD $)	4 Months Ended								4 Months Ended
	Apr. 20, 2013	Apr. 21, 2012	Jul. 21, 2012	Apr. 20, 2013 Other Current Assets	Dec. 29, 2012 Other Current Assets	Apr. 20, 2013 Interest Rate Contracts ButterKrust	Aug. 01, 2008 Interest Rate Contracts ButterKrust	Aug. 01, 2008 Interest Rate Contracts Holsum	Apr. 20, 2013 Interest rate risk derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Commodity derivatives fair value, net	$ (6,800,000)
Cash settlement on hedge	3,100,000
Notional amount of interest rate swap						33,800,000	85,000,000	65,000,000
Term loan outstanding	150,000,000		20,000,000
Fair value of interest rate swaps	(300,000)
Interest expense	8,819,000	4,229,000							500,000
Derivative instrument, asset				$ 17,800,000	$ 9,000,000