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 | | | | November 29, | | November 30, | | November 29, | | November 30, | | | | 2011 | | 2010 | | 2011 | | 2010 | | Service cost | $ | 134 | | $ | 129 | | $ | 268 | | $ | 258 | | Interest cost | | 576 | | | 573 | | | 1,152 | | | 1,146 | | Expected return on plan assets | | (126 | ) | | (98 | ) | | (252 | ) | | (196 | ) | Amortization of prior service cost | | 64 | | | 82 | | | 128 | | | 164 | | Recognized actuarial loss | | 426 | | | 398 | | | 852 | | | 796 | | Net periodic benefit cost | $ | 1,074 | | $ | 1,084 | | $ | 2,148 | | $ | 2,168 | | | | | | | | Postretirement Medical and Life Benefits | | | | Thirteen weeks ended | | Twenty-six weeks ended | | | | November 29, | | November 30, | | November 29, | | November 30, | | | | 2011 | | 2010 | | 2011 | | 2010 | | Service cost | $ | 2 | | $ | 2 | | $ | 4 | | $ | 4 | | Interest cost | | 18 | | | 19 | | | 36 | | | 38 | | Amortization of prior service cost | | (14 | ) | | (15 | ) | | (28 | ) | | (30 | ) | Recognized actuarial loss | | 34 | | | 28 | | | 68 | | | 56 | | Net periodic benefit cost | $ | 40 | | $ | 34 | | $ | 80 | | $ | 68 | |
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