Contingencies and Litigation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2016	Aug. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 15.5	$ 17.8
Document Period End Date	Nov. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discounted present value of future minimum lease payments	$ 14.6
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	$ 11.6