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General (Details Textual) (USD $)
3 Months Ended
Aug. 30, 2012
Aug. 25, 2011
Aug. 30, 2012
Fair Value, Inputs, Level 1 [Member]
May 31, 2012
Fair Value, Inputs, Level 1 [Member]
Depreciation $ 8,259,000 $ 8,750,000    
Percentage Of Cash Dividends 110.00%      
Available-for-sale Securities, Fair Value Disclosure     $ 78,000 $ 78,000