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Employee Benefit Plans (Details Textual) (USD $)
 12 Months Ended
May 30, 2013
May 31, 2012
May 26, 2011
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees Gross Pay 1.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 25.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 6.00%    
Defined Contribution Plan Employer Discretionary Contribution percentage 1.00%    
Defined Contribution Plan, Cost Recognized $ 3,369,000 $ 3,078,000 $ 2,988,000
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax, Total 6,361,000 6,766,000  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax, Total 7,273,000 7,756,000  
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax (912,000) (990,000)  
Defined Benefit Plan, Accumulated Benefit Obligation 21,936,000 21,382,000  
Defined Benefit Plan, Actuarial Gain (Loss) (119,000) 2,674,000  
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax 364,000    
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax 78,000    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax, Total $ 268,000    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.40% 4.25%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 4.00% 4.00%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.25% 5.30% 5.70%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 4.00% 5.00% 5.00%