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PENSION AND POSTRETIREMENT BENEFITS (Tables) | 9 Months Ended
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Feb. 23, 2025
PENSION AND POSTRETIREMENT BENEFITS |
Schedule of Defined Benefit Plans Disclosures | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Plans
​ | ​ | Thirteen Weeks Ended | ​ | Thirty-Nine Weeks Ended
​ |  | February 23, 2025 |  | February 25, 2024 |  | February 23, 2025 |  | February 25, 2024
Service cost | ​ | $ | 1.4 | ​ | $ | 1.5 | ​ | $ | 4.1 | ​ | $ | 4.4
Interest cost | ​ | ​ | 34.4 | ​ | ​ | 36.1 | ​ | ​ | 101.8 | ​ | ​ | 109.5
Expected return on plan assets | ​ | ​ | (37.0) | ​ | ​ | (35.3) | ​ | ​ | (109.4) | ​ | ​ | (106.9)
Amortization of prior service cost | ​ | ​ | 0.4 | ​ | ​ | 0.4 | ​ | ​ | 1.2 | ​ | ​ | 1.2
Settlement loss | ​ | ​ | — | ​ | ​ | 1.1 | ​ | ​ | — | ​ | ​ | 1.1
Pension cost (benefit) — Company plans | ​ | ​ | (0.8) | ​ | ​ | 3.8 | ​ | ​ | (2.3) | ​ | ​ | 9.3
Pension cost (benefit) — multi-employer plans | ​ | ​ | 2.1 | ​ | ​ | 2.1 | ​ | ​ | 7.3 | ​ | ​ | 6.9
Total pension cost (benefit) | ​ | $ | 1.3 | ​ | $ | 5.9 | ​ | $ | 5.0 | ​ | $ | 16.2
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Postretirement Plans
​ | ​ | Thirteen Weeks Ended | ​ | Thirty-Nine Weeks Ended
​ |  | February 23, 2025 |  | February 25, 2024 |  | February 23, 2025 |  | February 25, 2024
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | 0.1 | ​ | $ | 0.1
Interest cost | ​ | ​ | 0.6 | ​ | ​ | 0.7 | ​ | ​ | 1.8 | ​ | ​ | 2.0
Amortization of prior service cost (benefit) | ​ | ​ | (0.4) | ​ | ​ | (0.4) | ​ | ​ | (1.3) | ​ | ​ | (1.2)
Recognized net actuarial gain | ​ | ​ | (1.1) | ​ | ​ | (1.2) | ​ | ​ | (3.4) | ​ | ​ | (3.6)
Total postretirement cost (benefit) | ​ | $ | (0.9) | ​ | $ | (0.9) | ​ | $ | (2.8) | ​ | $ | (2.7)

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-2 + Details
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