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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)

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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 + Details
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