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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Reclassifications from Accumulated Other Comprehensive Loss into Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 29, 2020 | Aug. 30, 2020 | Nov. 24, 2019 | Aug. 25, 2019 | Nov. 29, 2020 | Nov. 24, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest expense, net | $ (107.7) |  | $ (121.4) |  | $ (221.4) | $ (244.1)
Pension and postretirement non-service income | (13.7) |  | (11.3) |  | (27.5) | (20.8)
Selling, general and administrative expenses | (357.7) |  | (369.8) |  | (658.0) | (770.6)
Income before income taxes and equity method investment earnings | 437.2 |  | 318.0 |  | 847.2 | 468.5
Income tax expense | (80.7) |  | (84.1) |  | (167.4) | (72.6)
Net income attributable to Conagra Brands, Inc. | 378.9 | $ 329.0 | 260.5 | $ 173.8 | 707.9 | 434.3
Reclassification out of accumulated other comprehensive loss | Derivative adjustments, net of reclassification adjustments |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest expense, net | (0.7) |  | (0.8) |  | (1.6) | (1.6)
Selling, general and administrative expenses | (0.5) |  | 0.0 |  | (0.5) | 0.0
Income before income taxes and equity method investment earnings | (1.2) |  | (0.8) |  | (2.1) | (1.6)
Income tax expense | 0.3 |  | 0.2 |  | 0.5 | 0.4
Net income attributable to Conagra Brands, Inc. | (0.9) |  | (0.6) |  | (1.6) | (1.2)
Reclassification out of accumulated other comprehensive loss | Net prior service cost |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Pension and postretirement non-service income | 0.1 |  | 0.1 |  | 0.2 | 0.3
Reclassification out of accumulated other comprehensive loss | Net actuarial gain |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Pension and postretirement non-service income | (0.9) |  | (1.1) |  | (1.8) | (2.3)
Reclassification out of accumulated other comprehensive loss | Curtailment |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Pension and postretirement non-service income |  |  |  |  | 0.0 | 0.6
Reclassification out of accumulated other comprehensive loss | Pension and postretirement benefit obligations, net of reclassification adjustments |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income taxes and equity method investment earnings | (0.8) |  | (1.0) |  | (1.6) | (1.4)
Income tax expense | 0.2 |  | 0.3 |  | 0.4 | 0.4
Net income attributable to Conagra Brands, Inc. | $ (0.6) |  | $ (0.7) |  | $ (1.2) | $ (1.0)

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