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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 28, 2023 | May 29, 2022 | May 30, 2021
Pension Plan [Member] |  |  |
Long-term rate of return on plan assets | 4.56% | 3.87% | 3.74%
Interest Cost [Member] | Pension Plan [Member] |  |  |
Discount rate - interest cost | 4.09% | 2.29% | 2.30%
Interest Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Discount rate - interest cost | 3.83% | 1.69% | 1.74%
Service Cost [Member] | Pension Plan [Member] |  |  |
Discount rate - interest cost | 4.74% | 3.50% | 3.35%
Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Discount rate - interest cost | 4.60% | 3.55% | 3.03%

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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