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