CONTINGENCIES (Details) - USD ($) $ in Millions		12 Months Ended
	May 25, 2025	May 25, 2025	May 26, 2024	May 31, 2020
CONTINGENCIES
Insurance Settlements Receivable	$ 81.8	$ 81.8	$ 14.7
Threshold amount for Environmental Matters		1.0
Threatened Litigation
CONTINGENCIES
Loss contingency accrual	204.5	204.5	76.3
Settled Litigation
CONTINGENCIES
Loss contingency accrual payments		12.0	12.0
Loss contingency accrual	16.7	16.7
Litigation settlement amount				$ 101.7
Accounts Receivable
CONTINGENCIES
Insurance Settlements Receivable	78.4	78.4	7.1
Noncurrent Assets
CONTINGENCIES
Insurance Settlements Receivable	3.4	3.4	7.6
Other accrued liabilities | Threatened Litigation
CONTINGENCIES
Loss contingency accrual	160.2	160.2	30.4
Other noncurrent liabilities | Threatened Litigation
CONTINGENCIES
Loss contingency accrual	44.3	44.3	45.9
Beatrice
CONTINGENCIES
Accrual for environmental loss contingencies	36.0	36.0	39.3
Beatrice | Other accrued liabilities
CONTINGENCIES
Accrual for environmental loss contingencies	$ 3.2	$ 3.2	$ 3.3
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Beatrice | Other noncurrent liabilities
CONTINGENCIES
Accrual for environmental loss contingencies	$ 32.8	$ 32.8	$ 36.0
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Reese V Conagra Brands Inc
CONTINGENCIES
Loss contingency accrual payments		$ 25.0
Reese V Conagra Brands Inc | Scenario, Plan [Member]
CONTINGENCIES
Litigation settlement amount	$ 185.0