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PENSION AND POSTRETIREMENT BENEFITS | 3 Months Ended
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Aug. 28, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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 28, 2016 |  | August 30, 2015
Service cost | $ | 16.7 |  |  | $ | 23.8 |
Interest cost | 30.0 |  |  | 41.0 |
Expected return on plan assets | (53.8 | ) |  | (66.9 | )
Amortization of prior service cost | 0.6 |  |  | 0.7 |
Benefit cost — Company plans | (6.5 | ) |  | (1.4 | )
Pension benefit cost — multi-employer plans | 2.3 |  |  | 2.3 |
Total benefit cost (benefit) | $ | (4.2 | ) |  | $ | 0.9 |
| Postretirement Benefits
| Thirteen weeks ended
| August 28, 2016 |  | August 30, 2015
Service cost | $ | — |  |  | $ | 0.1 |
Interest cost | 1.1 |  |  | 2.0 |
Amortization of prior service benefit | (1.7 | ) |  | (2.0 | )
Recognized net actuarial loss | 0.1 |  |  | — |
Total cost (benefit) | $ | (0.5 | ) |  | $ | 0.1 |
Beginning in fiscal 2017, the Company has elected to use a split discount rate (spot-rate approach) for the U.S. plans and certain foreign plans. Historically, a single weighted-average discount rate was used in the calculation of service and interest costs, both of which are components of pension benefit costs. The spot-rate approach applies separate discount rates for each projected benefit payment in the calculation of pension service and interest cost. This change is considered a change in accounting estimate and has been applied prospectively. The pre-tax reduction in total pension benefit cost associated with this change in the first quarter of fiscal 2017 was approximately $7.4 million. The weighted-average discount rates for service and interest costs under the spot-rate approach used for pension benefit cost in fiscal 2017 were 4.14% and 3.15%, respectively. During the first quarter of fiscal 2017, we contributed $3.0 million to our pension plans and contributed $4.5 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 $9.5 million to our pension plans for the remainder of fiscal 2017. We anticipate making further contributions of $17.6 million to our other postretirement plans during the remainder of fiscal 2017. 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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