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Note 3 - Acquisitions (Detail) (USD $)
 3 Months Ended 1 Months Ended 1 Months Ended
Aug. 26, 2012
Aug. 28, 2011
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]
Apr. 23, 2012
GreenLine [Member]
Customer Base [Member]
Apr. 23, 2012
GreenLine [Member]
Feb. 24, 2013
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 4,000,000 7,000,000   10,000,000
Revenues 102,074,000 73,301,000       3,000,000            
Business Acquisition, Contingent Consideration, at Fair Value     (3,926,000)         3,900,000        
Business Acquisition, Cost of Acquired Entity, Purchase Price     66,826,000         66,800,000        
Effective Income Tax Rate, Continuing Operations 37.00% 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                  
Escrow Deposit Released                       3,300,000
Business Acquisition, Contingent Consideration, Cash Payment                     $ 10,000,000