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RETIREMENT AND POSTEMPLOYMENT BENEFITS
 3 Months Ended
Aug. 26, 2018
Retirement and Postemployment Benefits [Abstract]  
Retirement and Postemployment Benefits

(14) Retirement and Postemployment Benefits

In fiscal 2018, we approved an amendment to reorganize the U.S. qualified defined benefit pension plans and the supplemental pension plans that resulted in the spinoff of a portion of the General Mills Pension Plan (the Plan) and the 2005 Supplemental Retirement Plan and the Supplemental Retirement Plan (Grandfathered) (together, the Supplemental Plans) into new plans effective May 31, 2018. The benefits offered to the plans’ participants were unchanged. The result of the reorganization was the creation of the General Mills Pension Plan I (Plan I) and the 2005 Supplemental Retirement Plan I and the Supplemental Retirement Plan I (Grandfathered) (together, the Supplemental Plans I). The reorganization was made to facilitate a targeted investment strategy over time and to provide additional flexibility in evaluating opportunities to reduce risk and volatility. Actuarial gains and losses associated with the Plan and the Supplemental Plans are amortized over the average remaining service life of the active participants. Actuarial gains and losses associated with Plan I and the Supplemental Plans I are amortized over the average remaining life of the participants.

Components of net periodic benefit expense are as follows:

Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Quarter EndedQuarter EndedQuarter Ended
In MillionsAug. 26, 2018Aug. 27, 2017Aug. 26, 2018Aug. 27, 2017Aug. 26, 2018Aug. 27, 2017
Service cost$23.7$23.9$2.4$2.8$1.9$2.1
Interest cost62.055.48.37.70.70.6
Expected return on plan assets(111.5)(119.1)(10.1)(13.0)--
Amortization of losses27.544.10.20.20.10.2
Amortization of prior service costs (credits)0.40.5(1.4)(1.4)0.10.2
Other adjustments----2.83.4
Net expense (income)$2.1$4.8$(0.6)$(3.7)$5.6$6.5