Note 10 - Debt (Detail) - Long-term debt consists of the following: (Parentheticals) (USD $)	6 Months Ended	12 Months Ended
	Nov. 25, 2012	May 27, 2012
Real Estate Loan [Member]
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]
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]
Monthly payment principal and interest (in Dollars)	175,356,000	175,356,000
Annual fixed interest rate	4.39%	4.39%
Term Note [Member]
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]
Variable interest rate	0.33%	0.42%