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Commitments And Contingencies (Details) (USD $)
3 Months Ended
Aug. 26, 2012
Aug. 26, 2012
Workers Compensation And General Liabilities Accrued
May 27, 2012
Workers Compensation And General Liabilities Accrued
Aug. 26, 2012
Operating Lease Obligation
May 27, 2012
Operating Lease Obligation
Aug. 26, 2012
Property Lease Guarantee
May 27, 2012
Property Lease Guarantee
Standby letters of credit   $ 103,600,000 $ 99,200,000 $ 20,800,000 $ 20,300,000    
Loss Contingency, Range of Possible Loss, Maximum           5,100,000 5,400,000
Fair value of potential payments discounted at pre-tax cost of capital related to guarantee obligations           3,900,000 4,100,000
Accrued liabilities resulting from reassessment of likelihood of third parties defaulting on assignment agreements $ 0