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PENSION AND POSTRETIREMENT BENEFITS (Tables) | 9 Months Ended
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Feb. 27, 2022
Compensation And Retirement Disclosure [Abstract] |
Components of Pension and Postretirement Plan Costs (Benefits) | Components of pension and postretirement plan costs (benefits) are:
|  | Pension Plans |
|  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
|  | February 27, 2022 |  |  | February 28, 2021 |  |  | February 27, 2022 |  |  | February 28, 2021 |
Service cost |  | $ | 2.0 |  |  | $ | 2.7 |  |  | $ | 6.7 |  |  | $ | 9.0 |
Interest cost |  |  | 20.9 |  |  |  | 21.7 |  |  |  | 62.5 |  |  |  | 65.1 |
Expected return on plan assets |  |  | (36.4 | ) |  |  | (35.0 | ) |  |  | (109.1 | ) |  |  | (105.0 | )
Amortization of prior service cost |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 1.4 |  |  |  | 1.7 |
Pension cost (benefit) — Company plans |  |  | (13.0 | ) |  |  | (10.1 | ) |  |  | (38.5 | ) |  |  | (29.2 | )
Pension cost (benefit) — multi-employer plans |  |  | 2.0 |  |  |  | 1.7 |  |  |  | 6.3 |  |  |  | 5.7 |
Total pension cost (benefit) |  | $ | (11.0 | ) |  | $ | (8.4 | ) |  | $ | (32.2 | ) |  | $ | (23.5 | )
|  | Postretirement Plans |
|  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
|  | February 27, 2022 |  |  | February 28, 2021 |  |  | February 27, 2022 |  |  | February 28, 2021 |
Service cost |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 0.1 |
Interest cost |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 1.0 |  |  |  | 1.1 |
Amortization of prior service cost (benefit) |  |  | (0.5 | ) |  |  | (0.5 | ) |  |  | (1.4 | ) |  |  | (1.5 | )
Recognized net actuarial gain |  |  | (0.9 | ) |  |  | (0.8 | ) |  |  | (2.7 | ) |  |  | (2.6 | )
Total postretirement cost (benefit) |  | $ | (1.0 | ) |  | $ | (0.9 | ) |  | $ | (2.9 | ) |  | $ | (2.9 | )

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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=123450688&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=123447040&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=123447040&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=123447040&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=123447040&loc=d3e2417-114920 + Details
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