VARIABLE INTEREST ENTITIES (Reflected in Condensed Consolidated Balance Sheets) (Details) - Variable interest entities - USD ($) $ in Millions	Feb. 28, 2016	May. 31, 2015
Variable Interest Entity [Line Items]
Assets	$ 80.8	$ 93.5
Liabilities	70.8	49.5
Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets	2.1	13.7
Receivables, less allowance for doubtful accounts
Variable Interest Entity [Line Items]
Assets	0.1	0.2
Inventories
Variable Interest Entity [Line Items]
Assets	1.7	1.3
Prepaid expenses and other current assets
Variable Interest Entity [Line Items]
Assets	0.4	0.3
Property, plant and equipment, net
Variable Interest Entity [Line Items]
Assets	52.3	53.2
Goodwill
Variable Interest Entity [Line Items]
Assets	18.8	18.8
Brands, trademarks and other intangibles, net
Variable Interest Entity [Line Items]
Assets	5.4	6.0
Current installments of long-term debt
Variable Interest Entity [Line Items]
Liabilities	0.5	0.0
Accounts payable
Variable Interest Entity [Line Items]
Liabilities	8.9	16.9
Accrued payroll
Variable Interest Entity [Line Items]
Liabilities	0.6	0.7
Other accrued liabilities
Variable Interest Entity [Line Items]
Liabilities	0.7	0.6
Senior long-term debt, excluding current installments
Variable Interest Entity [Line Items]
Liabilities	29.5	0.0
Other noncurrent liabilities (noncontrolling interest)
Variable Interest Entity [Line Items]
Liabilities	$ 30.6	$ 31.3