DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 30, 2012
Fair values:
Commodity derivative assets	5,077		1,821
Commodity derivative liabilities	(2,778)		(1,530)
Cash collateral posted with (owed to) brokers	(1,501)		(166)
Foreign currency derivative liabilities	(42)		0
Put Options Written [Member]
Fair values:
Fair value	(953)	[1]	0	[1]
Number of contracts:
Open Option Contracts Written, Expiration Date	May 31, 2013	[1]
Short Positions On Outstanding Future [Member]
Fair values:
Fair value	4,909	[1]	1,464	[1]
Corn [Member]
Derivatives Coverage:
Derivatives Coverage	(0.30%)	[2]	0.00%	[2]
Period through which stated percent of needs are covered:
Derivative, Maturity Date	Mar. 31, 2014	[2]	Dec. 31, 2013	[2]
Corn [Member] | Put Options Written [Member]
Number of contracts:
Open Option Contracts Written, Number of Contracts	500	[1]	0	[1]
Corn [Member] | Short Positions On Outstanding Future [Member]
Number of contracts:
Short Positions on Outstanding Future Contracts, Number of Contracts	1,469	[1]	584	[1]
Soybean Meal [Member]
Derivatives Coverage:
Derivatives Coverage	0.50%	[2]	0.00%	[2]
Period through which stated percent of needs are covered:
Derivative, Maturity Date	Dec. 31, 2013	[2]	Dec. 31, 2013	[2]
Soybean Meal [Member] | Short Positions On Outstanding Future [Member]
Number of contracts:
Short Positions on Outstanding Future Contracts, Number of Contracts	895	[1]	269	[1]

[1] A written put option is an option that the Company has sold that grants the holder the right, but not the obligation, to sell the underlying asset at a certain price for a specified period of time. When the Company takes a short position on a futures derivative instrument, it agrees to sell the underlying asset in the future at a price established on the contract date. The Company writes put options and takes short positions on futures derivative instruments to minimize the impact of feed ingredients price volatility on its operating results.

[2] Derivatives coverage is the percent of anticipated commodity needs covered by outstanding derivative instruments through a specified date.