Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	May 25, 2025	May 26, 2024	May 28, 2023
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 1,152.5	$ 347.7	$ 683.2
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization	390.2	400.9	369.9
Asset impairment charges	177.0	1,035.5	771.1
Equity method investment earnings less than (in excess of) distributions	(22.1)	74.0	(73.6)
Stock-settled share-based payments expense	41.5	30.8	79.2
Contributions to pension plans	(11.9)	(12.2)	(12.5)
Pension benefit	(19.6)	(0.6)	(13.9)
Other items	7.1	16.4	8.4
Increase (Decrease) in Operating Capital [Abstract]
Receivables	173.8	77.2	(102.1)
Inventories	(35.6)	131.9	(265.3)
Deferred income taxes and income taxes payable, net	(224.0)	(81.1)	(188.5)
Prepaid expenses and other current assets	(0.9)	(2.2)	23.5
Accounts and other payables	49.6	(22.7)	(248.9)
Accrued payroll	(45.9)	29.7	12.5
Other accrued liabilities	(0.9)	(20.0)	(7.3)
Litigation receivables, net of recoveries	(67.1)	(14.7)
Litigation accruals, net of payments	128.2	25.0	(14.8)
Deferred employer payroll taxes			(25.5)
Net cash flows from operating activities	1,691.9	2,015.6	995.4
Net Cash Provided by (Used in) Investing Activities [Abstract]
Additions to property, plant and equipment	(389.3)	(388.1)	(362.2)
Sales of marketable securities	3.4	0.8	3.2
Purchase of marketable securities		(10.3)	(5.2)
Sale of marketable securities		10.3	5.2
Purchase of businesses, net of cash acquired	(230.6)
Proceeds from divestitures, net of cash divested	76.8
Proceeds from insurance recoveries		11.9
Other items	(2.5)	0.4	4.1
Net cash flows from investing activities	(542.2)	(375.0)	(354.9)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Issuance of short-term borrowings, maturities greater than 90 days	338.0	466.6	286.8
Repayment of short-term borrowings, maturities greater than 90 days	(135.3)	(185.9)	(330.0)
Net issuance (repayment) of other short-term borrowings, maturities less than or equal to 90 days	(328.3)	9.9	394.6
Issuance of long-term debt		500.0	500.0
Repayment of long-term debt	(281.3)	(1,772.6)	(712.4)
Debt issuance costs		(3.3)	(4.1)
Repurchase of Conagra Brands, Inc. common shares	(64.0)		(150.0)
Cash dividends paid	(669.2)	(659.3)	(623.8)
Exercise of stock options and issuance of other stock awards, including tax withholdings	(20.6)	(13.8)	2.3
Other items	2.4	1.7	5.0
Net cash flows from financing activities	(1,158.3)	(1,656.7)	(631.6)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(2.4)	1.2	1.7
Net change in cash and cash equivalents and restricted cash, including cash balances classified as assets held for sale	(11.0)	(14.9)	10.6
Less: Net change in cash balances classified as assets held for sale	(1.3)	0.7	(0.5)
Net change in cash and cash equivalents and restricted cash	(9.7)	(15.6)	11.1
Cash and cash equivalents and restricted cash at beginning of year	77.7	93.3	82.2
Cash and cash equivalents and restricted cash at end of year	$ 68.0	$ 77.7	$ 93.3