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Note 17 - Pension and Postretirement Benefits - Weighted Average Actuarial Assumption Used to Determine Net Expense (Details) | 12 Months Ended
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May 29, 2022 | May 30, 2021 | May 31, 2020
Pension Plan [Member] |  |  |
Long-term rate of return on plan assets | 3.87% | 3.74% | 4.77%
Interest Cost [Member] | Pension Plan [Member] |  |  |
Discount rate - interest cost | 2.29% | 2.30% | 3.51%
Interest Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Discount rate - interest cost | 1.69% | 1.74% | 3.09%
Service Cost [Member] | Pension Plan [Member] |  |  |
Discount rate - interest cost | 3.50% | 3.35% | 4.04%
Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Discount rate - interest cost | 3.55% | 3.03% | 3.47%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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