Business Acquisitions (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 01, 2015	Aug. 31, 2015	May 31, 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 (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
Goodwill			19.3
Intangible assets acquired			31.4
Liabilities assumed			19.9
Transaction costs			1.1
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
Assets acquired			373.3
Property, plant and equipment acquired			248.0
Intangible assets and goodwill acquired			125.3
Liabilities assumed			230.0
Deferred tax liabilities assumed			4.1
Transaction costs			2.1
Hanson [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Real property			$ 33.3