DIVESTITURES AND ASSETS HELD FOR SALE - Schedule of Assets and Liabilities Classified as Held for Sale (Details) - USD ($) $ in Millions	Nov. 24, 2019	May 26, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 19.1	$ 36.7
Noncurrent assets	45.9	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	13.4	9.9
Noncurrent assets	17.1	43.9
Current liabilities	0.5	5.1
Noncurrent liabilities	0.2
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	5.7	5.4
Noncurrent assets	28.8	62.3
Current liabilities	0.5	0.5
Noncurrent liabilities	$ 0.2	0.0
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