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Note 2 - Acquisitions (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Feb. 24, 2013
Feb. 26, 2012
Feb. 24, 2013
Feb. 26, 2012
Feb. 26, 2012
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]
Feb. 24, 2013
GreenLine [Member]
Customer Base [Member]
Apr. 23, 2012
GreenLine [Member]
Feb. 24, 2013
GreenLine [Member]
May 27, 2012
GreenLine [Member]
May 29, 2011
Lifecore [Member]
May 31, 2012
Lifecore [Member]
May 31, 2011
Lifecore [Member]
Apr. 30, 2010
Lifecore [Member]
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           6,600,000
Business Acquisition, Contingent Consideration, Potential Cash Payment             4,000,000 3,000,000     7,000,000         10,000,000  
Revenues 117,867,000 80,064,000 334,595,000 234,935,000         3,000,000                
Business Acquisition, Contingent Consideration, at Fair Value           (3,933,000)             3,900,000        
Business Acquisition, Cost of Acquired Entity, Purchase Price           66,833,000         66,800,000            
Effective Income Tax Rate, Continuing Operations     31.00%   38.00%             40.00%          
Number of Intangible Assets Identified                       2          
Indefinite Lived Intangible Assets Market Value                       36,000,000          
Finite-lived Intangible Assets Acquired                   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          
Escrow Deposit Released                             3,300,000 3,300,000  
Business Acquisition, Contingent Consideration, Cash Payment                           $ 10,000,000