Contingencies and Litigation - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	May. 31, 2015	Aug. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations and Divestiture Activities[Line Items]
Outstanding letters of credit	$ 16.4	$ 14.0
Litigation Settlement, Expense	3.0
Discounted present value of future minimum lease payments	18.5
Electrical
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations and Divestiture Activities[Line Items]
Discounted present value of future minimum lease payments	$ 13.7