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BUSINESSES HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS (Narrative) (Details) $ in Millions			3 Months Ended
	Aug. 31, 2015 USD ($) location	Jul. 31, 2015 USD ($) location	Aug. 31, 2015 USD ($) location	Aug. 31, 2014 USD ($)	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Nov. 30, 2012 USD ($)
Australian Steel Distribution Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of locations sold | location		6
Proceeds from sale of business		$ 26.4
Pre-tax gain		8.1
Currency translation gain		10.1
Impairment charges		$ 3.0
Number of locations where operations ceased | location			3
Number of locations held for sale | location	1
Howell
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain					$ 23.8
Business divestiture disposal price				$ 1.1		$ 58.5
Escrow receivable	$ 3.2		$ 3.2	$ 3.2
Working capital adjustment					$ 3.0
Trinecke Zelezarny
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business divestiture disposal price							$ 29.0
Percentage of ownership before transaction							11.00%
Pretax gain on disposal, continuing operations							$ 26.1

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