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DISCONTINUED OPERATIONS AND OTHER DIVESTITURES - Summary of Comparative Financial Results (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May 27, 2018
Feb. 25, 2018
Nov. 26, 2017
Aug. 27, 2017
May 28, 2017
Feb. 26, 2017
Nov. 27, 2016
Aug. 28, 2016
May 27, 2018
May 28, 2017
May 29, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Income (loss) from discontinued operations, net of tax $ (0.3) $ 14.5 $ 0.4 $ (0.3) $ (1.7) $ 0.7 $ 11.6 $ 91.4 $ 14.3 $ 102.0 $ (794.4)
Net income from discontinued operations attributable to Conagra Brands, Inc.                 14.3 95.2 (803.6)
Lamb Weston | Spinoff                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net sales                 0.0 1,407.9 2,975.0
Income (loss) from operations of discontinued operations before income taxes                 (0.3) 172.3 474.8
Income (loss) before income taxes and equity method investment earnings                 (0.3) 172.3 474.8
Income tax expense (benefit)                 (14.6) 87.5 178.9
Equity method investment earnings                 0.0 15.9 71.7
Income (loss) from discontinued operations, net of tax                 14.3 100.7 367.6
Less: Net income attributable to noncontrolling interests                 0.0 6.8 9.2
Net income from discontinued operations attributable to Conagra Brands, Inc.                 14.3 93.9 358.4
Private Brands | Disposed of by sale                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net sales                 0.0 0.0 2,490.6
(Loss) gain on sale of businesses                 0.0 (1.6) 0.0
Long-lived asset impairment charges                 0.0 0.0 (1,923.0)
Income (loss) from operations of discontinued operations before income taxes                 0.4 3.9 168.0
Income (loss) before income taxes and equity method investment earnings                 0.4 2.3 (1,755.0)
Income tax expense (benefit)                 0.5 (0.3) (593.1)
Income (loss) from discontinued operations, net of tax                 $ (0.1) $ 2.6 $ (1,161.9)