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Note 9 - Debt (Details) - Long-term Debt (Parentheticals) (USD $)
12 Months Ended
May 26, 2013
May 27, 2012
Real Estate Loan [Member]
   
Debt Instrument [Line Items]    
Monthly payment principal and interest (in Dollars) $ 133,060,000 $ 133,060,000
Annual fixed interest rate 4.02% 4.02%
Real Estate Bridge Loan [Member]
   
Debt Instrument [Line Items]    
Monthly payment principal and interest (in Dollars) 8,902,000 8,902,000
Annual fixed interest rate 4.02% 4.02%
Capital Equipment Loan [Member]
   
Debt Instrument [Line Items]    
Monthly payment principal and interest (in Dollars) 175,356,000 175,356,000
Annual fixed interest rate 4.39% 4.39%
Term Note [Member]
   
Debt Instrument [Line Items]    
Term note with BMO Harris monthly payments (in Dollars) $ 250,000,000 $ 250,000,000
Variable interest rate 2.00% 2.00%
Industrial Revenue Bonds [Member]
   
Debt Instrument [Line Items]    
Variable interest rate 0.38% 0.42%