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PENSION AND POSTRETIREMENT BENEFITS | 3 Months Ended
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Aug. 27, 2017
Retirement Benefits [Abstract] |
PENSION AND POSTRETIREMENT BENEFITS | PENSION AND POSTRETIREMENT BENEFITS We have defined benefit retirement plans ("plans") for eligible salaried and hourly employees. Benefits are based on years of credited service and average compensation or stated amounts for each year of service. We also sponsor postretirement plans which provide certain medical and dental benefits ("other postretirement benefits") to qualifying U.S. employees. Components of pension benefit and other postretirement benefit costs are (includes amounts related to discontinued operations):
| Pension Benefits
| Thirteen Weeks Ended
| August 27, 2017 |  | August 28, 2016
Service cost | $ | 12.7 |  |  | $ | 16.7 |
Interest cost | 28.2 |  |  | 30.0 |
Expected return on plan assets | (54.2 | ) |  | (53.8 | )
Amortization of prior service cost | 0.7 |  |  | 0.6 |
Benefit cost (benefit) — Company plans | (12.6 | ) |  | (6.5 | )
Pension benefit cost — multi-employer plans | 1.5 |  |  | 2.3 |
Total benefit cost (benefit) | $ | (11.1 | ) |  | $ | (4.2 | )
| Postretirement Benefits
| Thirteen Weeks Ended
| August 27, 2017 |  | August 28, 2016
Service cost | $ | — |  |  | $ | — |
Interest cost | 0.9 |  |  | 1.1 |
Amortization of prior service benefit | (0.8 | ) |  | (1.7 | )
Recognized net actuarial loss | — |  |  | 0.1 |
Total cost (benefit) | $ | 0.1 |  |  | $ | (0.5 | )
The Company uses a split discount rate (spot-rate approach) for the U.S. plans and certain foreign plans. The spot-rate approach applies separate discount rates for each projected benefit payment in the calculation of pension service and interest cost. The weighted-average discount rates for service and interest costs under the spot-rate approach used for pension benefit cost in fiscal 2018 were 4.19% and 3.26%, respectively. During the first quarter of fiscal 2018, we contributed $3.8 million to our pension plans and contributed $3.9 million to our other postretirement plans. Based upon the current funded status of the plans and the current interest rate environment, we anticipate making further contributions of approximately $9.1 million to our pension plans for the remainder of fiscal 2018. We anticipate making further contributions of $14.8 million to our other postretirement plans during the remainder of fiscal 2018. These estimates are based on ERISA guidelines, current tax laws, plan asset performance, and liability assumptions, which are subject to change.

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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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