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Note 17 - Pension and Postretirement Benefits (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 28, 2023 | May 29, 2022 | May 30, 2021
Defined Benefit Plan, Recognized Net Actuarial Gain (Loss), Percentage |  | 10.00% |
Fair Value Investments Ability To Impose Customary Redemption Gates | $ 26,200 |  |
Fair Value Investments Impose Customary Redemption Gates | 0 |  |
Defined Contribution Plan, Cost | $ 59,400 | $ 57,900 | $ 47,600
Maximum [Member] |  |  |
Red Zone Multiemployer Plans Funded Percentage | 65.00% |  |
Yellow Zone Multiemployer Plans Funded Percentage | 80.00% |  |
Green Zone Multiemployer Plan Funded Percentage | 80.00% |  |
Minimum [Member] |  |  |
Percentage Providing More Than Plans Contribution | 5.00% |  |
Private Equity Funds [Member] |  |  |
Unfunded Commitment For Additional Investment | $ 35,200 |  |
Natural Resources Funds [Member] |  |  |
Unfunded Commitment For Additional Investment | $ 10,100 |  |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 90.00% |  |
Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |  |
Pension Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 265,500 | $ 503,100 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 5.50% | 4.48% |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | $ (158,100) | $ (366,100) |
Defined Benefit Plan, Accumulated Benefit Obligation | 2,800,000 | 3,130,000 |
Defined Benefit Plan Recognized Net Actuarial Gain Loss | 100 | 2,900 | $ 800
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 12,100 |  |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 6,300 | $ 9,500 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 5.37% | 4.24% |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | $ 100 | $ 100 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 7,200 |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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