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Goodwill and Other Intangible Assets Goodwill by Segment (Details) $ in Thousands	3 Months Ended
	Nov. 30, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance, Goodwill	$ 154,055
Effect of foreign currency translation adjustments	(389)
Ending Balance, Goodwill	153,666
Energy [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	552
Effect of foreign currency translation adjustments	0
Ending Balance, Goodwill	552
Ag [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	142,929
Effect of foreign currency translation adjustments	(389)
Ending Balance, Goodwill	142,540
Corporate and Other
Goodwill [Roll Forward]
Beginning Balance, Goodwill	10,574
Effect of foreign currency translation adjustments	0
Ending Balance, Goodwill	10,574
Nitrogen Production [Member]
Goodwill [Roll Forward]
Ending Balance, Goodwill	0
Foods [Member]
Goodwill [Roll Forward]
Ending Balance, Goodwill	$ 0

X

- Definition

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.

+ 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

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

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Period Type:	instant

X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Details

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- Details

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