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Retirement Plans | 4 Months Ended
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Jan. 21, 2018
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract] |
Retirement Plans | RETIREMENT PLANS Defined benefit pension plans — We sponsor two defined benefit pension plans, a “Qualified Plan” covering substantially all full-time employees hired prior to January 1, 2011, and an unfunded supplemental executive retirement plan (“SERP”) which provides certain employees additional pension benefits and was closed to new participants effective January 1, 2007. In fiscal 2011, the Board of Directors approved the sunset of our Qualified Plan whereby participants no longer accrue benefits effective December 31, 2015. Benefits under both plans are based on the employee’s years of service and compensation over defined periods of employment. Postretirement healthcare plans — We also sponsor two healthcare plans, closed to new participants, that provide postretirement medical benefits to certain employees who have met minimum age and service requirements. The plans are contributory; with retiree contributions adjusted annually, and contain other cost-sharing features such as deductibles and coinsurance. Net periodic benefit cost — The components of net periodic benefit cost in each period were as follows (in thousands):
| Sixteen Weeks Ended
| January 21, 2018 |  | January 22, 2017
Defined benefit pension plans: |  |  |
Interest cost | $ | 6,879 |  |  | $ | 6,996 |
Service cost | 687 |  |  | 673 |
Expected return on plan assets | (8,680 | ) |  | (8,659 | )
Actuarial loss (1) | 1,498 |  |  | 1,881 |
Amortization of unrecognized prior service costs (1) | 45 |  |  | 47 |
Net periodic benefit cost | $ | 429 |  |  | $ | 938 |
Postretirement healthcare plans: |  |  |
Interest cost | $ | 294 |  |  | $ | 309 |
Actuarial (gain) loss (1) | (8 | ) |  | 50 |
Net periodic benefit cost | $ | 286 |  |  | $ | 359 |
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(1) | Amounts were reclassified from accumulated OCI into net earnings as a component of selling, general and administrative expenses.
Future cash flows — Our policy is to fund our plans at or above the minimum required by law. As of January 1, 2017, the date of our last actuarial funding valuation, there was no minimum contribution funding requirement. Details regarding 2018 contributions are as follows (in thousands):
| SERP |  | Postretirement Healthcare Plans
Net year-to-date contributions | $ | 1,100 |  |  | $ | 610 |
Remaining estimated net contributions during fiscal 2018 | $ | 3,300 |  |  | $ | 700 |
We continue to evaluate contributions to our Qualified Plan based on changes in pension assets as a result of asset performance in the current market and the economic environment. We do not anticipate making any contributions to our Qualified Plan in fiscal 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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