| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| | | Thirteen Weeks Ended | | | Thirty-Nine Weeks Ended | |
| | | February 25, 2024 | | | February 26, 2023 | | | February 25, 2024 | | | February 26, 2023 | |
| Net sales | | | | | | | | | | | | | | | | |
| Grocery & Snacks | | $ | 1,286.0 | | | $ | 1,243.7 | | | $ | 3,784.0 | | | $ | 3,781.9 | |
| Refrigerated & Frozen | | | 1,202.4 | | | | 1,307.7 | | | | 3,692.5 | | | | 3,936.8 | |
| International | | | 271.7 | | | | 259.7 | | | | 811.5 | | | | 751.9 | |
| Foodservice | | | 272.8 | | | | 275.4 | | | | 857.0 | | | | 833.1 | |
| Total net sales | | $ | 3,032.9 | | | $ | 3,086.5 | | | $ | 9,145.0 | | | $ | 9,303.7 | |
| Operating profit | | | | | | | | | | | | | | | | |
| Grocery & Snacks | | $ | 299.3 | | | $ | 256.4 | | | $ | 837.2 | | | $ | 847.2 | |
| Refrigerated & Frozen | | | 201.5 | | | | 263.6 | | | | 620.9 | | | | 297.6 | |
| International | | | 42.2 | | | | 37.1 | | | | 71.8 | | | | 100.9 | |
| Foodservice | | | 35.4 | | | | 23.8 | | | | 117.5 | | | | 53.5 | |
| Total operating profit | | $ | 578.4 | | | $ | 580.9 | | | $ | 1,647.4 | | | $ | 1,299.2 | |
| Equity method investment earnings | | | 41.2 | | | | 50.5 | | | | 131.0 | | | | 149.0 | |
| General corporate expense | | | 107.0 | | | | 90.9 | | | | 238.5 | | | | 280.9 | |
| Pension and postretirement non-service expense (income) | | | 1.4 | | | | (6.0 | ) | | | 2.1 | | | | (18.2 | ) |
| Interest expense, net | | | 106.5 | | | | 104.2 | | | | 325.8 | | | | 301.6 | |
| Income tax expense | | | 95.9 | | | | 100.1 | | | | 297.1 | | | | 237.0 | |
| Net income | | $ | 308.8 | | | $ | 342.2 | | | $ | 914.9 | | | $ | 646.9 | |
| Less: Net income attributable to noncontrolling interests | | | 0.2 | | | | 0.5 | | | | 0.4 | | | | 0.8 | |
| Net income attributable to Conagra Brands, Inc. | | $ | 308.6 | | | $ | 341.7 | | | $ | 914.5 | | | $ | 646.1 | |
| | | Thirteen Weeks Ended | | | Thirty-Nine Weeks Ended | |
| | | February 25, 2024 | | | February 26, 2023 | | | February 25, 2024 | | | February 26, 2023 | |
| Frozen | | $ | 1,021.8 | | | $ | 1,101.2 | | | $ | 3,076.3 | | | $ | 3,267.1 | |
| Staples | | | | | | | | | | | | | | | | |
| Other shelf-stable | | | 750.1 | | | | 719.2 | | | | 2,174.9 | | | | 2,167.7 | |
| Refrigerated | | | 180.6 | | | | 206.5 | | | | 616.2 | | | | 669.7 | |
| Snacks | | | 535.9 | | | | 524.5 | | | | 1,609.1 | | | | 1,614.2 | |
| Foodservice | | | 272.8 | | | | 275.4 | | | | 857.0 | | | | 833.1 | |
| International | | | 271.7 | | | | 259.7 | | | | 811.5 | | | | 751.9 | |
| Total net sales | | $ | 3,032.9 | | | $ | 3,086.5 | | | $ | 9,145.0 | | | $ | 9,303.7 | |
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