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General (Details1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Aug. 30, 2012
Aug. 25, 2011
Numerator:    
Net earnings $ 10,679 $ 12,477
Denominator:    
Denominator for basic EPS 28,921 29,643
Effect of dilutive employee stock options 43 26
Denominator for diluted EPS 28,964 29,669
Common Stock [Member]
    
Net earnings per share - basic:    
Common Stock (in dollars per share) $ 0.38 $ 0.43
Net earnings per share - diluted:    
Common Stock (In Dollars per share) $ 0.37 $ 0.42
Common Class B [Member]
    
Net earnings per share - basic:    
Common Stock (in dollars per share) $ 0.35 $ 0.40
Net earnings per share - diluted:    
Common Stock (In Dollars per share) $ 0.34 $ 0.40