Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

Name:	us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Feb. 29, 2016	Nov. 30, 2014	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2012
Commitments And Contingencies [Line Items]
Lease expense			$ 5.0	$ 5.1	$ 5.0
Lindsay, Nebraska Facility [Member]
Commitments And Contingencies [Line Items]
Environmental Remediation Expense	$ 13.0	$ 1.5				$ 7.2
Current environmental remediation accrual			$ 16.6