Business Acquisitions (Details) $ in Millions	12 Months Ended
	Aug. 31, 2016 USD ($)
Two Acquisitions (Inala & Shemer) Completed In Fiscal Year 2016 [Member]
Business Acquisition [Line Items]
Amount of cash paid for business acquisitions	$ 72.3
Assets acquired	92.2
Intangible assets acquired	31.4
Liabilities assumed	19.9
Two Acquisitions (Inala & Shemer) Completed In Fiscal Year 2016 [Member] | EMS [Member]
Business Acquisition [Line Items]
Goodwill	$ 19.3
Hanson [Member]
Business Acquisition [Line Items]
Date of acquisition	Jan. 13, 2016
Amount of cash paid for business acquisitions	$ 139.2
Real property	33.3
Assets acquired	406.4
Property, plant and equipment acquired	276.8
Intangible assets and goodwill acquired	129.6
Liabilities assumed	230.0
Deferred tax liabilities assumed	$ 3.9