DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Assets and Liabilities Classified as Held for Sale) (Details) - USD ($) $ in Millions	Aug. 30, 2015	May. 31, 2015	Aug. 24, 2014	May. 25, 2014
Discontinued Operations and Disposal Groups [Abstract]
Cash and cash equivalents	$ 22.6	$ 18.4	$ 21.9	$ 64.9
Receivables, less allowance for doubtful accounts of $0.4 and $0.5	201.8	200.4
Inventories	511.9	486.0
Prepaid expenses and other current assets	3.8	34.2
Current assets held for sale	740.1	739.0
Property, plant and equipment, net	898.2	914.1
Goodwill	991.5	1,600.8
Brands, trademarks and other intangibles, net	525.1	1,716.6
Other assets	3.0	2.6
Noncurrent assets held for sale	2,417.8	4,234.1
Accounts payable	226.9	219.5
Other accrued liabilities	56.7	68.4
Current liabilities held for sale	283.6	287.9
Senior long-term debt, excluding current installments	39.9	40.0
Other noncurrent liabilities	223.5	709.9
Noncurrent liabilities held for sale	$ 263.4	$ 749.9