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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Reclassifications From Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 23, 2020 | Nov. 24, 2019 | Aug. 25, 2019 | May 26, 2019 | Feb. 24, 2019 | Nov. 25, 2018 | Aug. 26, 2018 | May 31, 2020 | May 26, 2019 | May 27, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | $ (487.1) | $ (391.4) | $ (158.7)
Pension and postretirement non-service income |  |  |  |  |  |  |  |  | (9.9) | (35.1) | (80.4)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1,622.5 | 1,473.4 | 1,398.4
Income from continuing operations before income taxes and equity method investment earnings |  |  |  |  |  |  |  |  | 969.9 | 823.3 | 874.8
Income tax expense |  |  |  |  |  |  |  |  | (201.3) | (218.8) | (174.6)
Net income attributable to Conagra Brands, Inc. | $ 201.4 | $ 204.4 | $ 260.5 | $ 173.8 | $ 126.5 | $ 242.0 | $ 131.6 | $ 178.2 | 840.1 | 678.3 | 808.4
Reclassification out of accumulated other comprehensive loss | Cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (3.3) | (1.9) | 0.1
Income from continuing operations before income taxes and equity method investment earnings |  |  |  |  |  |  |  |  | (3.3) | (1.9) | 0.1
Income tax expense |  |  |  |  |  |  |  |  | 0.9 | 0.5 | 0.0
Net income attributable to Conagra Brands, Inc. |  |  |  |  |  |  |  |  | (2.4) | (1.4) | 0.1
Reclassification out of accumulated other comprehensive loss | Net prior service cost (benefit) |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement non-service income |  |  |  |  |  |  |  |  | 0.6 | 0.9 | (0.4)
Reclassification out of accumulated other comprehensive loss | Net actuarial gain |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement non-service income |  |  |  |  |  |  |  |  | (4.6) | (1.4) | 0.0
Reclassification out of accumulated other comprehensive loss | Pension and Postretirement healthcare settlement | Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement non-service income |  |  |  |  |  |  |  |  | (2.1) | 0.0 | 1.3
Reclassification out of accumulated other comprehensive loss | Pension and Postretirement healthcare settlement | Postretirement Healthcare |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement non-service income |  |  |  |  |  |  |  |  | (0.2) | (1.0) | 0.0
Reclassification out of accumulated other comprehensive loss | Curtailment |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement non-service income |  |  |  |  |  |  |  |  | 0.8 | 0.0 | 0.0
Reclassification out of accumulated other comprehensive loss | Amortization of pension and postretirement benefit obligations: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income taxes and equity method investment earnings |  |  |  |  |  |  |  |  | (5.5) | (1.5) | 0.9
Income tax expense |  |  |  |  |  |  |  |  | 1.4 | 0.4 | (0.2)
Net income attributable to Conagra Brands, Inc. |  |  |  |  |  |  |  |  | (4.1) | (1.1) | 0.7
Reclassification out of accumulated other comprehensive loss | Currency translation losses |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 10.4 | 0.0
Income from continuing operations before income taxes and equity method investment earnings |  |  |  |  |  |  |  |  | 0.0 | 10.4 | 0.0
Income tax expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income attributable to Conagra Brands, Inc. |  |  |  |  |  |  |  |  | $ 0.0 | $ 10.4 | $ 0.0

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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