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PENSION AND POSTRETIREMENT BENEFITS (Tables) | 9 Months Ended
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Feb. 22, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Components of Pension Benefit and Other Postretirement Benefit Costs | Components of pension benefit and other postretirement benefit costs included:
| Pension Benefits
| Thirteen weeks ended |  | Thirty-nine weeks ended
| February 22, 2015 |  | February 23, 2014 |  | February 22, 2015 |  | February 23, 2014
Service cost | $ | 22.1 |  |  | $ | 22.3 |  |  | $ | 66.4 |  |  | $ | 66.8 |
Interest cost | 40.4 |  |  | 37.7 |  |  | 121.1 |  |  | 113.3 |
Expected return on plan assets | (67.0 | ) |  | (63.3 | ) |  | (201.0 | ) |  | (189.7 | )
Amortization of prior service cost | 0.9 |  |  | 1.1 |  |  | 2.7 |  |  | 2.9 |
Special termination benefits | — |  |  | — |  |  | 6.9 |  |  | — |
Benefit cost — Company plans | (3.6 | ) |  | (2.2 | ) |  | (3.9 | ) |  | (6.7 | )
Pension benefit cost — multi-employer plans | 2.8 |  |  | 2.7 |  |  | 9.5 |  |  | 9.4 |
Total benefit cost | $ | (0.8 | ) |  | $ | 0.5 |  |  | $ | 5.6 |  |  | $ | 2.7 |
| Postretirement Benefits
| Thirteen weeks ended |  | Thirty-nine weeks ended
| February 22, 2015 |  | February 23, 2014 |  | February 22, 2015 |  | February 23, 2014
Service cost | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 0.5 |
Interest cost | 2.5 |  |  | 2.5 |  |  | 7.5 |  |  | 7.3 |
Amortization of prior service benefit | (2.0 | ) |  | (1.8 | ) |  | (5.9 | ) |  | (5.4 | )
Recognized net actuarial loss | 0.9 |  |  | 1.6 |  |  | 2.6 |  |  | 5.0 |
Total cost | $ | 1.5 |  |  | $ | 2.4 |  |  | $ | 4.6 |  |  | $ | 7.4 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 + Details
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