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Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Feb. 17, 2012
Mar. 12, 2007
Mar. 12, 2007
5.40 percent fixed-rate notes due 2012 [Member]
Feb. 17, 2012
JP Morgan Alternate Base [Member]
Minimum [Member]
Feb. 17, 2012
JP Morgan Alternate Base [Member]
Maximum [Member]
Feb. 17, 2012
LIBOR [Member]
Minimum [Member]
Feb. 17, 2012
LIBOR [Member]
Maximum [Member]
Apr. 30, 2012
LineofCreditNew [Member]
Current Liabilities (Textuals)                
Debt Instrument, Face Amount   $ 1,000 $ 500          
Senior notes, rate     5.40%          
Unsecured revolving credit facility $ 500              
Debt Instrument, Basis Spread on Variable Rate       0.00% 0.50% 0.90% 1.50%  
Maximum ratio of debt to annual earnings before interest, taxes, depreciation and amortization as per agreement               3.25
Minimum ratio of annual earnings before interest, taxes, depreciation and amortization to interest payable as per agreement               3.00