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Note 17 - Pension and Postretirement Benefits (Details Textual) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Feb. 23, 2020 | Aug. 25, 2019 | May 29, 2022 | May 30, 2021 | May 31, 2020 | Dec. 31, 2019 | May 26, 2019
Defined Benefit Plan, Recognized Net Actuarial Gain (Loss), Percentage |  |  |  | 10.00% |  |  |  |
Fair Value Investments Ability To Impose Customary Redemption Gates |  |  |  | $ 29,400 |  |  |  |
Fair Value Investments Impose Customary Redemption Gates |  |  |  | 0 |  |  |  |
Defined Contribution Plan, Cost |  |  |  | $ 57,900 | $ 47,600 | $ 49,900 |  |
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 |  |  |  | $ 35,000 |  |  |  |
Natural Resources Funds [Member] |  |  |  |  |  |  |  |
Unfunded Commitment For Additional Investment |  |  |  | $ 10,400 |  |  |  |
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, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  |  |  | $ (0) | $ (200) | (800) |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  |  | 4.48% | 3.04% |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  |  | $ 0 | $ 200 |  |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  |  |  | (0) | (0) |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment |  | $ 79,800 |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment |  |  |  | 0 | 0 |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | 503,100 | 37,400 |  |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) |  |  |  | (366,100) | 194,600 |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | 3,130,000 | 3,740,000 |  |  |
Defined Benefit Plan Recognized Net Actuarial Gain Loss |  |  |  | 2,900 | 800 | 44,800 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  | 12,400 |  |  |  |
Pension Plan [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  |  | $ 600 |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  | 3.13% |  |  |  |  | 3.90%
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment |  |  | $ 12,300 |  |  |  |  |
Pension Plan [Member] | Hourly Pension Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | $ 200 |  |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.96% |  |  |  |  |  |  | 3.86%
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | $ 4,300 |  |  |  |  |  |  |
Pension Plan [Member] | Salaried Pension Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  |  |  |  |  | 3.37% | 3.89%
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  | 2,100 |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  | $ 154,600 |  |  |  |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  |  |  | $ (0) | $ (0) | $ (0) |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  |  | 4.24% | 2.51% |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  |  | $ 0 | $ (500) |  |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  |  |  | (0) | 300 |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment |  |  |  | 0 | 0 |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | 9,500 | 2,300 |  |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) |  |  |  | 100 | $ 200 |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  | $ 8,100 |  |  |  |

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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (b)(8) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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