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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 30, 2013
May 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Net benefit obligation at beginning of year $ 25,595 $ 22,010
Service cost 712 627
Interest cost 1,099 1,178
Actuarial (gain)/loss (119) 2,674
Benefits paid (848) (894)
Net benefit obligation at end of year 26,439 25,595
Amounts recognized in the statement of financial position    
Current accrued benefit liability (962) (906)
Noncurrent accrued benefit liability (25,477) (24,689)
Total (26,439) (25,595)
Amounts recognized in accumulated other comprehensive loss    
Net actuarial loss 7,273 7,756
Prior service credit (912) (990)
Total $ 6,361 $ 6,766