Note 17 - Pension and Postretirement Benefits- Schedule of Pension Plan Weighted-Average Asset Allocations and Target Asset Allocations (Details) - USD ($) $ in Millions	May 29, 2022	May 30, 2021
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%	8.00%
Defined Benefit Plan, Debt Security [Member]
Weighted-average Asset Allocations	87.00%	83.00%
Defined Benefit Plan, Real Estate [Member]
Weighted-average Asset Allocations	1.00%	1.00%
Private Equity Funds [Member]
Weighted-average Asset Allocations	4.00%	3.00%
Other Plan Asset Category [Member]
Weighted-average Asset Allocations	4.00%	5.00%
Receivable For Unsettled Transactions [Member]
Net payables for unsettled transactions	$ (9.6)
Pension Plan Assets [Member]
Total pension plan assets		$ 3,848.8
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]
Total pension plan assets	19.8	7.5
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US [Member]
Total pension plan assets	65.6	78.0
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]
Total pension plan assets	34.4	121.9
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Real Estate [Member]
Total pension plan assets	0.0	0.0
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		5.7
Net payables for unsettled transactions	(9.6)
Fair Value, Inputs, Level 1 [Member] | Pension Plan Assets [Member]
Total pension plan assets		213.1
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	93.2	85.0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US [Member]
Total pension plan assets	19.5	94.6
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]
Total pension plan assets	0.0	0.5
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Real Estate [Member]
Total pension plan assets	0.0	0.0
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
Total pension plan assets	653.1	772.6
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Total pension plan assets	2,179.3	2,407.2
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Total pension plan assets	8.6	12.4
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		3,372.3
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] | Defined Benefit Plan, Real Estate [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	113.0	92.5
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Defined Benefit Plan, Equity Securities, US [Member]
Total pension plan assets	85.1	172.6
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	122.4
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Defined Benefit Plan, Real Estate [Member]
Total pension plan assets	0.0	0.0
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | US Treasury and Government [Member]
Total pension plan assets	653.1	772.6
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Corporate Debt Securities [Member]
Total pension plan assets	2,179.3	2,407.2
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member]
Total pension plan assets	8.6	12.4
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Receivable For Unsettled Transactions [Member]
Total pension plan assets		5.7
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] | Pension Plan Assets [Member]
Total pension plan assets		3,585.4
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		$ 263.4