DIVESTITURES AND ASSETS HELD FOR SALE - Schedule of Assets and Liabilities Classified as Held for Sale (Details) - USD ($) $ in Millions	Feb. 23, 2020	May 26, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 4.7	$ 36.7
Noncurrent assets	3.1	262.4
Held-for-sale, not discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	4.7	9.9
Noncurrent assets	$ 3.1	43.9
Current liabilities		5.1
Lender's Bagel Business | Held-for-sale, not discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		5.4
Noncurrent assets		62.3
Current liabilities		0.5
DSD Snacks Business | Held-for-sale, not discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		21.4
Noncurrent assets		156.2
Current liabilities		$ 4.6