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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Reclassifications from Accumulated Other Comprehensive Loss into Income (Loss) (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | $ (158.7) | $ (195.5) | $ (295.8)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1,318.0 | 1,417.1 | 2,024.6
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)
Equity method investment earnings |  |  |  |  |  |  |  |  | 97.3 | 71.2 | 66.1
Total before tax |  |  |  |  |  |  |  |  | 972.1 | 800.7 | 174.9
Income tax expense |  |  |  |  |  |  |  |  | (174.6) | (254.7) | (46.4)
Net income (loss) attributable to Conagra Brands, Inc. | $ 69.6 | $ 362.8 | $ 223.5 | $ 152.5 | $ 151.3 | $ 179.7 | $ 122.1 | $ 186.2 | 808.4 | 639.3 | (677.0)
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | 0.1 | (0.2) | (2.1)
Total before tax |  |  |  |  |  |  |  |  | 0.1 | (0.2) | (2.1)
Income tax expense |  |  |  |  |  |  |  |  | 0.0 | 0.1 | 0.8
Net income (loss) attributable to Conagra Brands, Inc. |  |  |  |  |  |  |  |  | 0.1 | (0.1) | (1.3)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of pension and postretirement healthcare liabilities: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | 0.9 | 10.4 | (14.5)
Income tax expense |  |  |  |  |  |  |  |  | (0.2) | (4.0) | 4.9
Net income (loss) attributable to Conagra Brands, Inc. |  |  |  |  |  |  |  |  | 0.7 | 6.4 | (9.6)
Reclassification out of Accumulated Other Comprehensive Income | Net prior service benefit |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (0.4) | (3.9) | (5.1)
Reclassification out of Accumulated Other Comprehensive Income | Divestiture of Private Brands |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (4.3)
Reclassification out of Accumulated Other Comprehensive Income | Pension settlement of equity method investee |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment earnings |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (5.2)
Reclassification out of Accumulated Other Comprehensive Income | Pension settlement |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1.3 | 13.8 | 0.0
Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.5 | 0.1
Reclassification out of Accumulated Other Comprehensive Income | Currency translation losses |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 73.4
Total before tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 73.4
Income tax expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to Conagra Brands, Inc. |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 73.4

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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