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SHARE-BASED PAYMENTS - (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	May 25, 2025 USD ($) $ / shares shares	May 26, 2024 USD ($) $ / shares shares	May 28, 2023 USD ($) $ / shares shares	Sep. 14, 2023 shares
SHARE-BASED PAYMENTS
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) \| shares	0
Proceeds from Stock Options Exercised		$ 3.2	$ 10.7
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit		0.3	$ 0.7
Stock settled share unit awards
SHARE-BASED PAYMENTS
Granted, Performance Shares, share units (in shares) \| shares	2,200		1,600
Performance shares
SHARE-BASED PAYMENTS
Stock-based compensation expense		7.7
Share-Based Payment Arrangement, Income	$ 5.8		$ 45.0
Share-Based Payment Arrangement, Expense, Tax Benefit	$ 0.1	0.4	1.7
Granted, Performance Shares, share units (in shares) \| shares	720
Granted, Performance Shares, weighted average grant-date fair value (in dollars per share) \| $ / shares	$ 29.86
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 17.1	22.6
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 3.6
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 6 months
Performance shares \| Fiscal 2025
SHARE-BASED PAYMENTS
Share based award, vesting period	3 years
Performance shares \| Fiscal 2025 \| Minimum
SHARE-BASED PAYMENTS
Share based payment award, vesting rights payout, percentage	0
Performance shares \| Fiscal 2025 \| Maximum
SHARE-BASED PAYMENTS
Share based payment award, vesting rights payout, percentage	200
Performance shares \| Fiscal 2027
SHARE-BASED PAYMENTS
Share based award, vesting period	3 years
Employee Stock Option
SHARE-BASED PAYMENTS
Share based award, vesting period	3 years
Employee Stock Option \| Minimum
SHARE-BASED PAYMENTS
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)	7 years
Employee Stock Option \| Maximum
SHARE-BASED PAYMENTS
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)	10 years
Conagra Foods Stock Plan
SHARE-BASED PAYMENTS
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) \| shares				17,400
Common Stock, Capital Shares Reserved for Future Issuance (in shares) \| shares	13,800
Share unit awards \| Cash settled restricted stock units
SHARE-BASED PAYMENTS
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year)	3 years
Share unit awards \| Stock settled share unit awards
SHARE-BASED PAYMENTS
Stock-based compensation expense	$ 47.3	38.5	34.2
Share-Based Payment Arrangement, Expense, Tax Benefit	$ 9.5	$ 7.7	$ 6.2
Granted, Performance Shares, share units (in shares) \| shares	2,200	2,000
Granted, Performance Shares, weighted average grant-date fair value (in dollars per share) \| $ / shares	$ 27.34	$ 30.2	$ 33.28
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 43.1	$ 28.3	$ 34.7
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 52.8
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 8 months 12 days