DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Assets and Liabilities Classified as Held for Sale) (Additional Information) (Details) - USD ($) $ in Millions	Feb. 28, 2016	May. 31, 2015
Discontinued operations, held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Allowance for doubtful accounts	$ 0.0	$ 0.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period Type:	duration