Goodwill and Intangibles Goodwill by Segment (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Feb. 28, 2015	Aug. 31, 2014
Goodwill [Line Items]
Goodwill	$ 154,867us-gaap_Goodwill	$ 158,696us-gaap_Goodwill
Goodwill, Acquired During Period	388us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, Translation Adjustments	(4,217)us-gaap_GoodwillTranslationAdjustments
Energy [Member]
Goodwill [Line Items]
Goodwill	552	552
Goodwill, Acquired During Period	0
Goodwill, Translation Adjustments	0
Ag [Member]
Goodwill [Line Items]
Goodwill	147,417	151,246
Goodwill, Acquired During Period	388
Goodwill, Translation Adjustments	(4,217)
Corporate and Other
Goodwill [Line Items]
Goodwill	6,898	6,898
Goodwill, Acquired During Period	0
Goodwill, Translation Adjustments	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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