Contingencies and Litigation - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Feb. 28, 2017	Aug. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 16.6	$ 17.8
Document Period End Date	Feb. 28, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discounted present value of future minimum lease payments	$ 14.1
Electrical [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discounted present value of future minimum lease payments	$ 11.3