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Note 2 - Acquisitions (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		0 Months Ended
	May 26, 2013	May 27, 2012	May 29, 2011	Apr. 23, 2012	Apr. 23, 2012 Achieving Revenue Target [Member] GreenLine [Member]	Apr. 23, 2012 Exceeding Revenue Target [Member] GreenLine [Member]	Apr. 23, 2012 Revenue Target [Member] GreenLine [Member]	May 26, 2013 GreenLine [Member] Customer Base [Member]	Apr. 23, 2012 GreenLine [Member]	May 26, 2013 GreenLine [Member]	May 27, 2012 GreenLine [Member]	May 29, 2012 Lifecore [Member]	Apr. 30, 2010 Lifecore [Member]
Note 2 - Acquisitions (Details) [Line Items]
Number of Processing Plants									4
Business Acquisition, Cost of Acquired Entity, Cash Paid				$ 62,900,000					$ 62,900,000				$ 40,000,000
Business Acquisition, Escrow Deposit									4,700,000
Business Acquisition, Contingent Consideration, Potential Cash Payment					4,000,000	3,000,000			7,000,000				10,000,000
Revenues	441,708,000	317,552,000	276,729,000				3,000,000
Business Acquisition, Contingent Consideration, at Fair Value				(3,933,000)							3,900,000
Revenue, Net											9,100,000
Business Acquisition, Cost of Acquired Entity, Purchase Price				66,833,000					66,800,000
Effective Income Tax Rate, Continuing Operations	30.00%	36.00%	52.00%							40.00%
Number of Intangible Assets Identified										2
Indefinite Lived Intangible Assets Market Value										36,000,000
Finite-lived Intangible Assets Acquired		43,500,000						7,500,000
Finite-Lived Intangible Asset, Useful Life								13 years
Business Acquisition, Purchase Price Allocation, Goodwill Amount				13,158,000						13,200,000
Business Acquisition, Purchase Price Allocation, Net Deferred Tax Liabilities, Noncurrent										1,900,000
Business Combination, Acquisition Related Costs											1,400,000
Business Acquisition, Contingent Consideration, Cash Payment												$ 10,000,000

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Net amount of acquisition cost of a business combination allocated to noncurrent deferred tax liabilities.

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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