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SHARE-BASED PAYMENTS - (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	May 31, 2026 USD ($) $ / shares shares	May 25, 2025 USD ($) $ / shares shares	May 26, 2024 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
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit			$ 0.3
Stock settled share unit awards
SHARE-BASED PAYMENTS
Granted, Performance Shares, share units (in shares) \| shares	3,500		2,000
Performance shares
SHARE-BASED PAYMENTS
Stock-based compensation expense	$ 1.5
Share-Based Payment Arrangement, Income		$ 5.8	$ 7.7
Share-Based Payment Arrangement, Expense, Tax Benefit	$ 0.1	(0.1)	(0.4)
Granted, Performance Shares, share units (in shares) \| shares	1,020
Granted, Performance Shares, weighted average grant-date fair value (in dollars per share) \| $ / shares	$ 18.97
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 10.3	17.1	22.6
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 4.5
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 10 months 24 days
Performance shares \| Fiscal 2026
SHARE-BASED PAYMENTS
Share based award, vesting period	3 years
Performance shares \| Fiscal 2026 \| Minimum
SHARE-BASED PAYMENTS
Share based payment award, vesting rights payout, percentage	0
Performance shares \| Fiscal 2026 \| 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	11,300
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	$ 53.2	47.3	38.5
Share-Based Payment Arrangement, Expense, Tax Benefit	$ 10.7	$ 9.5	$ 7.7
Granted, Performance Shares, share units (in shares) \| shares	3,490	2,200
Granted, Performance Shares, weighted average grant-date fair value (in dollars per share) \| $ / shares	$ 16.86	$ 27.34	$ 30.2
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 47.7	$ 43.1	$ 28.3
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 48.7
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 8 months 12 days