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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Nov. 29, 2012
May 31, 2012
Accounts and notes receivable, reserves $ 1,267 $ 1,066
Preferred Stock, par (in dollars per share) $ 1 $ 1
Preferred Stock, authorized 1,000,000 1,000,000
Preferred Stock, issued 0 0
Cost of Common Stock in treasury, shares 3,920,030 2,298,904
Common Stock [Member]
    
Common Stock, par (in dollars per share) $ 1 $ 1
Common Stock, authorized 50,000,000 50,000,000
Common Stock, issued 22,416,440 22,372,198
Class B Common Stock [Member]
    
Common Stock, par (in dollars per share) $ 1 $ 1
Common Stock, authorized 33,000,000 33,000,000
Common Stock, issued 8,773,073 8,817,315
Common Stock, outstanding 8,773,073 8,817,315