BUSINESSES HELD FOR SALE, DISCONTINUED OPERATIONS AND DISPOSITIONS (Narrative) (Details) $ in Millions			3 Months Ended					12 Months Ended
	Aug. 31, 2016 Components	Aug. 31, 2015 Components	Aug. 31, 2016 USD ($) location	May 31, 2016 USD ($)	Aug. 31, 2015 USD ($) location	Aug. 31, 2014 USD ($)	Nov. 30, 2013 USD ($)	Aug. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of locations held for sale | Components	0
Currency translation gain				$ (13.5)
Australian Steel Distribution Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of locations held for sale | Components		1
Number of locations sold | location					6
Proceeds from sale of business			$ 4.4		$ 26.4
Pre-tax gain					8.1
Currency translation gain					$ 10.1
Number of locations where operations ceased | location			3
Howell
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain								$ 6.3
Business divestiture disposal price						$ 1.1	$ 58.5
Escrow receivable						$ 3.2		$ 3.2