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