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EMPLOYEE POST-EMPLOYMENT BENEFITS (Tables)
6 Months Ended
Dec. 04, 2012
EMPLOYEE POST-EMPLOYMENT BENEFITS [Abstract]  
Defined benefit plan disclosure
The following tables detail the components of net periodic benefit costs and the amounts recognized in our Condensed Consolidated Financial Statements for the Retirement Plan, Management Retirement Plan, and the Executive Supplemental Pension Plan (collectively, the "Pension Plans") and the Postretirement Medical and Life Benefits plans (in thousands):
 
 
Pension Benefits
 
 
Thirteen weeks ended
  
Twenty-six weeks ended
 
 
December 4,
  
November 29,
  
December 4,
  
November 29,
 
 
2012
  
2011
  
2012
  
2011
 
Service cost
$115  $134  $230  $268 
Interest cost
 525   576   1,050   1,152 
Expected return on plan assets
 (102 )  (126 )  (204 )  (252 )
Amortization of prior service cost
 26   64   52   128 
Recognized actuarial loss
 565   426   1,130   852 
Net periodic benefit cost
$1,129  $1,074  $2,258  $2,148 
    
 
Postretirement Medical and Life Benefits
 
 
Thirteen weeks ended
  
Twenty-six weeks ended
 
 
December 4,
  
November 29,
  
December 4,
  
November 29,
 
 
2012
  
2011
  
2012
  
2011
 
Service cost
$3  $2  $6  $4 
Interest cost
 15   18   30   36 
Amortization of prior service cost
 (14 )  (14 )  (28 )  (28 )
Recognized actuarial loss
 53   34   106   68 
Net periodic benefit cost
$57  $40  $114  $80 
 
(a)
Prior service costs are amortized on a straight-line basis over the average remaining service period of employees expected to receive benefits.