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Derivative Financial Instruments and Hedging Activities - Purchase and Sale Contracts (Details) - Not Designated as Hedging Instrument t in Thousands, T in Thousands, MMBtu in Thousands, Bushels in Thousands, Barrels in Thousands	May 31, 2020 T t Bushels MMBtu Barrels	Aug. 31, 2019 T t Bushels MMBtu Barrels
Grain and oilseed (bushels) | Long [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | Bushels	673,234	547,096
Grain and oilseed (bushels) | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | Bushels	788,434	717,522
Energy products (barrels) | Long [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | Barrels	18,970	13,895
Energy products (barrels) | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | Barrels	9,168	4,663
Processed grain and oilseed (tons) | Long [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	858	597
Processed grain and oilseed (tons) | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	1,686	2,454
Crop nutrients (tons) | Long [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	144	76
Crop nutrients (tons) | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0	23
Ocean Freight Contracts [Member] | Long [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | t	435	295
Ocean Freight Contracts [Member] | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | t	250	85
Natural gas (MMBtu) | Long [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBtu	0	130
Natural gas (MMBtu) | Short [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | MMBtu	0	0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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