DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Assets and Liabilities Classified as Held for Sale) (Details) - USD ($) $ in Millions	Nov. 29, 2015	May. 31, 2015	Nov. 23, 2014	May. 25, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 32.5	$ 18.4	$ 22.0	$ 64.9
Current assets held for sale	777.8	739.4
Noncurrent assets held for sale	2,379.2	4,240.4
Current liabilities held for sale	314.4	294.5
Noncurrent liabilities held for sale	234.7	709.3
Discontinued operations, held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	32.5	18.4
Receivables, less allowance for doubtful accounts of $0.5 and $0.5	227.0	199.2
Inventories	501.4	480.1
Prepaid expenses and other current assets	16.9	41.7
Current assets held for sale	777.8	739.4
Property, plant and equipment, net	940.4	920.4
Goodwill	913.2	1,600.8
Brands, trademarks and other intangibles, net	522.6	1,716.6
Other assets	3.0	2.6
Noncurrent assets held for sale	2,379.2	4,240.4
Accounts payable	241.1	219.5
Accrued payroll	4.7	0.0
Other accrued liabilities	68.6	75.0
Current liabilities held for sale	314.4	294.5
Other noncurrent liabilities	234.7	709.3
Noncurrent liabilities held for sale	$ 234.7	$ 709.3