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PENSION AND POSTRETIREMENT BENEFITS (Tables) | 6 Months Ended
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Nov. 25, 2018
Retirement Benefits [Abstract] |
Components of Pension Benefit and Other Postretirement Benefit Costs | Components of pension benefit and other postretirement benefit costs are:
| Pension Benefits
| Thirteen weeks ended |  | Twenty-six weeks ended
| November 25, 2018 |  | November 26, 2017 |  | November 25, 2018 |  | November 26, 2017
Service cost | $ | 2.8 |  |  | $ | 13.2 |  |  | $ | 5.5 |  |  | $ | 25.9 |
Interest cost | 32.7 |  |  | 27.7 |  |  | 64.7 |  |  | 55.9 |
Expected return on plan assets | (43.2 | ) |  | (54.6 | ) |  | (85.5 | ) |  | (108.8 | )
Amortization of prior service cost | 0.7 |  |  | 0.7 |  |  | 1.4 |  |  | 1.4 |
Recognized net actuarial loss | — |  |  | 3.4 |  |  | — |  |  | 3.4 |
Curtailment loss | — |  |  | 0.7 |  |  | — |  |  | 0.7 |
Benefit cost (benefit) — Company plans | (7.0 | ) |  | (8.9 | ) |  | (13.9 | ) |  | (21.5 | )
Pension benefit cost — multi-employer plans | 1.8 |  |  | 4.2 |  |  | 3.5 |  |  | 5.7 |
Total benefit cost (benefit) | $ | (5.2 | ) |  | $ | (4.7 | ) |  | $ | (10.4 | ) |  | $ | (15.8 | )
| Postretirement Benefits
| Thirteen weeks ended |  | Twenty-six weeks ended
| November 25, 2018 |  | November 26, 2017 |  | November 25, 2018 |  | November 26, 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Interest cost | 1.0 |  |  | 0.9 |  |  | 1.9 |  |  | 1.8 |
Amortization of prior service benefit | (0.5 | ) |  | (0.8 | ) |  | (1.0 | ) |  | (1.6 | )
Recognized net actuarial gain | (0.4 | ) |  | — |  |  | (0.8 | ) |  | — |
Curtailment gain | — |  |  | — |  |  | (0.6 | ) |  | — |
Total cost (benefit) | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | (0.4 | ) |  | $ | 0.2 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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