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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
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Aug. 30, 2020 | Aug. 25, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Interest expense, net | $ (113.7) | $ (122.7)
Pension and postretirement non-service income | (13.8) | (9.5)
Income before income taxes and equity method investment earnings | 410.0 | 150.5
Income tax expense | (86.7) | 11.5
Net income attributable to Conagra Brands, Inc. | 329.0 | 173.8
Reclassification out of accumulated other comprehensive loss | Derivative adjustments, net of reclassification adjustments |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Interest expense, net | (0.9) | (0.8)
Income before income taxes and equity method investment earnings | (0.9) | (0.8)
Income tax expense | 0.2 | 0.2
Net income attributable to Conagra Brands, Inc. | (0.7) | (0.6)
Reclassification out of accumulated other comprehensive loss | Net prior service cost |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Pension and postretirement non-service income | 0.1 | 0.2
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 | (0.9) | (1.2)
Reclassification out of accumulated other comprehensive loss | Pension and postretirement liabilities |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Income before income taxes and equity method investment earnings | (0.8) | (0.4)
Income tax expense | 0.2 | 0.1
Net income attributable to Conagra Brands, Inc. | (0.6) | (0.3)
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 | $ 0.0 | $ 0.6

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