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Note 17 - Pension and Postretirement Benefits- Schedule of Pension Plan Weighted-Average Asset Allocations and Target Asset Allocations (Details) - USD ($) $ in Millions | May 28, 2023 | May 29, 2022
--- | --- | ---
Fair value measurement of pension plan assets in the fair value hierarchy |  | $ 3,294.7
Weighted-average Asset Allocations | 100.00% | 100.00%
Defined Benefit Plan, Equity Securities [Member] |  |
Weighted-average Asset Allocations | 4.00% | 4.00%
Defined Benefit Plan, Debt Security [Member] |  |
Weighted-average Asset Allocations | 84.00% | 87.00%
Defined Benefit Plan, Real Estate [Member] |  |
Weighted-average Asset Allocations | 1.00% | 1.00%
Private Equity Funds [Member] |  |
Weighted-average Asset Allocations | 4.00% | 4.00%
Other Plan Asset Category [Member] |  |
Weighted-average Asset Allocations | 7.00% | 4.00%
Receivable For Unsettled Transactions [Member] |  |
Net payables for unsettled transactions |  | $ (9.6)
Pension Plan Assets [Member] |  |
Total pension plan assets | $ 2,948.5 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 5.7 | 19.8
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US [Member] |  |
Total pension plan assets | 59.0 | 65.6
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |
Total pension plan assets | 34.4 | 34.4
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Receivable For Unsettled Transactions [Member] |  |
Total pension plan assets | 2.6 |
Net payables for unsettled transactions |  | (9.6)
Fair Value, Inputs, Level 1 [Member] | Pension Plan Assets [Member] |  |
Total pension plan assets | 101.7 |
Fair value measurement of pension plan assets in the fair value hierarchy |  | 110.2
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 152.6 | 93.2
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US [Member] |  |
Total pension plan assets | 19.5 | 19.5
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member] |  |
Total pension plan assets | 562.2 | 653.1
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Total pension plan assets | 1,878.1 | 2,179.3
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Total pension plan assets | 22.0 | 8.6
Fair Value, Inputs, Level 2 [Member] | Receivable For Unsettled Transactions [Member] |  |
Total pension plan assets | 0.0 |
Net payables for unsettled transactions |  | 0.0
Fair Value, Inputs, Level 2 [Member] | Pension Plan Assets [Member] |  |
Total pension plan assets | 2,634.4 |
Fair value measurement of pension plan assets in the fair value hierarchy |  | 2,953.7
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, US [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Total pension plan assets | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Receivable For Unsettled Transactions [Member] |  |
Total pension plan assets | 0.0 |
Net payables for unsettled transactions |  | 0.0
Fair Value, Inputs, Level 3 [Member] | Pension Plan Assets [Member] |  |
Total pension plan assets | 0.0 |
Fair value measurement of pension plan assets in the fair value hierarchy |  | 0.0
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |
Total pension plan assets | 158.3 | 113.0
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Defined Benefit Plan, Equity Securities, US [Member] |  |
Total pension plan assets | 78.5 | 85.1
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |
Total pension plan assets | 34.4 | 34.4
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | US Treasury and Government [Member] |  |
Total pension plan assets | 562.2 | 653.1
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Corporate Debt Securities [Member] |  |
Total pension plan assets | 1,878.1 | 2,179.3
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Total pension plan assets | 22.0 | 8.6
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Receivable For Unsettled Transactions [Member] |  |
Total pension plan assets | 2.6 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Pension Plan Assets [Member] |  |
Total pension plan assets | 2,736.1 |
Fair value measurement of pension plan assets in the fair value hierarchy |  | 3,063.9
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Fair value measurement of pension plan assets in the fair value hierarchy |  | $ 230.8
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan Assets [Member] |  |
Total pension plan assets | $ 212.4 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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