Business Acquisitions (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 01, 2015	Aug. 31, 2015	Feb. 29, 2016	Aug. 31, 2015
Plasticos [Member]
Business Acquisition [Line Items]
Date of acquisition				Jul. 01, 2015
Amount of cash paid for business acquisitions	$ 111.0
Assets acquired		$ 168.5		$ 168.5
Goodwill				41.7
Intangible assets acquired		32.1		32.1
Liabilities assumed		49.7		49.7
Percentage of equity interest acquired	100.00%
Step acquisition gain		6.2
Previously held equity interest		1.6
Plasticos [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired		24.4		$ 24.4
Plasticos [Member] | Customer Relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets				10 years
Plasticos [Member] | Intellectual Property [Member]
Business Acquisition [Line Items]
Intangible assets acquired		6.5		$ 6.5
Plasticos [Member] | Intellectual Property [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets				5 years
Plasticos [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets acquired		1.2		$ 1.2
Plasticos [Member] | Trade Names [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated useful life of intangible assets				1 year
Five Additional Acquisitions Completed In Fiscal Year 2015 [Member]
Business Acquisition [Line Items]
Amount of cash paid for business acquisitions				$ 117.0
Assets acquired		167.8		167.8
Goodwill				42.4
Intangible assets acquired		31.7		31.7
Liabilities assumed		$ 50.8		$ 50.8
Two Acquisitions Completed In Fiscal Year 2016 [Member]
Business Acquisition [Line Items]
Amount of cash paid for business acquisitions			$ 72.3
Assets acquired			92.2
Goodwill			19.3
Intangible assets acquired			31.4
Liabilities assumed			19.9
Transaction costs			1.0
Two Acquisitions Completed In Fiscal Year 2016 [Member] | EMS [Member]
Business Acquisition [Line Items]
Goodwill			19.3
Hanson [Member]
Business Acquisition [Line Items]
Amount of cash paid for business acquisitions			139.2
Assets acquired			370.9
Property, plant and equipment acquired			250.0
Intangible assets and goodwill acquired			120.9
Liabilities assumed			230.0
Deferred tax liabilities assumed			1.7
Transaction costs			1.6
Hanson [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Real property			$ 33.3