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ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 26, 2018 | Feb. 28, 2018 | Oct. 31, 2017 | Apr. 30, 2017 | Sep. 30, 2016 | Nov. 25, 2018 | May 26, 2019 | May 27, 2018 | May 28, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment for acquisition, net of cash acquired |  |  |  |  |  |  | $ 5,119.2 | $ 337.1 | $ 325.7
Aggregate principal amount issued |  |  |  |  |  |  | 10,722.0 | 3,526.4 |
Issuance of Conagra Brands, Inc. common shares, net |  |  |  |  |  |  | 555.7 | 0.0 | 0.0
Increase to goodwill |  |  |  |  |  |  | 1.5 | (1.5) |
Net sales |  |  |  |  |  |  | 319.1 | 214.3 | 36.5
Non-recurring expense related to inventory fair value adjustments |  |  |  |  |  |  | 53.0 |  |
Classified as goodwill |  |  |  |  |  |  | 11,499.6 | 4,487.4 | $ 4,280.8
Pinnacle Foods Inc. (Pinnacle) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amount of cash each share of common stock acquired is convertible into (usd per share) | $ 43.11 |  |  |  |  |  |  |  |
Number of shares of stock each share of common stock acquired is convertible into (shares) | 0.6494 |  |  |  |  |  |  |  |
Par value of shares into which each common stock acquired is convertible into (usd per share) | $ 5.00 |  |  |  |  |  |  |  |
Consideration paid in connection with acquisition | $ 8,030.0 |  |  |  |  |  |  |  |
Cash payments made in connection with acquisition | 5,170.0 |  |  |  |  |  |  |  |
Cash payment for acquisition, net of cash acquired | 5,120.0 |  |  |  |  |  |  |  |
Company shares issues out of treasury (shares) |  |  |  |  |  | 77,500,000 |  |  |
Value of company shares issued out of treasury in connection with acquisition | 2,820.0 |  |  |  |  |  |  |  |
Replacement awards to be issued to former employees of acquired entity | 51.1 |  |  |  |  |  |  |  |
Issuance of Conagra Brands, Inc. common shares, net |  |  |  |  |  | $ 555.7 |  |  |
Increase to goodwill |  |  |  |  |  |  | 353.9 |  |
Reduction in value of brands, trademarks and other intangibles |  |  |  |  |  |  | 355.6 |  |
Reduction in property, plant and equipment |  |  |  |  |  |  | 20.8 |  |
Reduction in deferred tax liabilities |  |  |  |  |  |  | 32.3 |  |
Goodwill deductible for income tax purposes | 236.7 |  |  |  |  |  |  |  |
Classified as amortizing intangible asset | $ 668.7 |  |  |  |  |  |  |  |
Weighted average useful life | 25 years |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | 1,730.0 |  |
Operating profit |  |  |  |  |  |  | 238.2 |  |
Acquisition-related costs |  |  |  |  |  |  | 66.8 | 62.7 |
Non-recurring expense related to inventory fair value adjustments |  |  |  |  |  |  |  | $ 54.1 |
Non-recurring expense related to securing bridge financing |  |  |  |  |  |  | $ 45.7 |  |
Classified as goodwill | $ 7,015.9 |  |  |  |  |  |  |  |
Sandwich Bros. of Wisconsin |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment for acquisition, net of cash acquired |  | $ 87.3 |  |  |  |  |  |  |
Classified as amortizing intangible asset |  | 7.1 |  |  |  |  |  |  |
Classified as goodwill |  | 57.8 |  |  |  |  |  |  |
Classified as non-amortizing intangible assets |  | $ 9.7 |  |  |  |  |  |  |
Angie's Artisan Treats, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment for acquisition, net of cash acquired |  |  | $ 249.8 |  |  |  |  |  |
Goodwill deductible for income tax purposes |  |  | 95.4 |  |  |  |  |  |
Classified as amortizing intangible asset |  |  | 10.3 |  |  |  |  |  |
Classified as goodwill |  |  | 156.7 |  |  |  |  |  |
Classified as non-amortizing intangible assets |  |  | $ 73.8 |  |  |  |  |  |
Thanasi Foods, LLC and BIGS LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment for acquisition, net of cash acquired |  |  |  | $ 217.6 |  |  |  |  |
Goodwill deductible for income tax purposes |  |  |  | 70.5 |  |  |  |  |
Classified as amortizing intangible asset |  |  |  | 16.1 |  |  |  |  |
Classified as goodwill |  |  |  | 133.3 |  |  |  |  |
Classified as non-amortizing intangible assets |  |  |  | $ 65.1 |  |  |  |  |
Frontera Foods, Inc. and Red Fork LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash payment for acquisition, net of cash acquired |  |  |  |  | $ 108.1 |  |  |  |
Classified as amortizing intangible asset |  |  |  |  | 7.2 |  |  |  |
Classified as goodwill |  |  |  |  | 39.5 |  |  |  |
Classified as non-amortizing intangible assets |  |  |  |  | $ 59.5 |  |  |  |
Underwritten Public Offering |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  |  |  | 8,330.0 |  |  |
Cash proceeds received from issuance of common stock |  |  |  |  |  | 575.0 |  |  |
Issuance of Conagra Brands, Inc. common shares, net |  |  |  |  |  | $ 555.7 |  |  |

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