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Share-Based Payments (Tables)
9 Months Ended
Feb. 26, 2012
Share-Based Payments [Abstract]  
Weighted average Black-Scholes assumptions for stock options granted
         

Expected volatility (%)

    22.89  

Dividend yield (%)

    3.97  

Risk-free interest rate (%)

    1.38  

Expected life of stock option (years)

    4.75