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Note 2 - Acquisitions (Detail) (USD $)
 3 Months Ended 6 Months Ended 18 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Nov. 25, 2012
Nov. 27, 2011
Nov. 25, 2012
Nov. 27, 2011
Nov. 27, 2012
Apr. 23, 2012
Apr. 30, 2012
Achieving Revenue Target [Member]
GreenLine [Member]
Apr. 30, 2012
Exceeding Revenue Target [Member]
GreenLine [Member]
Apr. 23, 2012
Revenue Target [Member]
GreenLine [Member]
Nov. 25, 2012
GreenLine [Member]
Customer Base [Member]
Apr. 23, 2012
GreenLine [Member]
Nov. 25, 2012
GreenLine [Member]
Apr. 30, 2012
GreenLine [Member]
May 29, 2011
Lifecore [Member]
Apr. 30, 2012
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 114,654,000 81,570,000 216,728,000 154,871,000         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     29.00%   38.00%             40.00%      
Number of Intangible Assets Identified                       2 years      
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   1,900,000                        
Escrow Deposit Released                             3,300,000
Business Acquisition, Contingent Consideration, Cash Payment                           $ 10,000,000