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Investments - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (59,308) | $ (48,393) | $ (137,111) | $ (124,521) |
Cost Method Investments |  | 130,966 |  | 130,966 |  | $ 131,605
Investments |  | $ 3,787,163 |  | $ 3,787,163 |  | 3,750,993
CF Nitrogen LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 2,800,000 |  |  |  |  |
Ownership percentage |  | 11.40% |  | 11.40% |  |
Equity Method Investments |  | $ 2,786,806 |  | $ 2,786,806 |  | 2,756,076
Ventura Foods, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 354,588 |  | 354,588 |  | 347,016
TEMCO, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 37,769 |  | 37,769 |  | 41,323
Ardent Mills LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | $ 205,805 |  | $ 205,805 |  | 206,529
Cargill, Inc. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership of joint venture partner |  | 50.00% |  | 50.00% |  |
Nitrogen Production [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (35,639) | (24,534) | $ (79,986) | (60,787) |
Foods [Member] | Ventura Foods, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  | 50.00% |  |
Equity value exceeding carrying value |  | $ 12,900 |  | $ 12,900 |  |
Corporate and Other |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (11,343) | (14,269) | $ (29,166) | (43,624) |
Corporate and Other | Ardent Mills LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  | 12.00% |  | 12.00% |  |
Number of parent companies |  | 3 |  | 3 |  |
Ag [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (11,359) | $ (9,199) | $ (25,180) | $ (18,071) |
Ag [Member] | TEMCO, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  | 50.00% |  |
Miscellaneous Investments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | $ 271,229 |  | $ 271,229 |  | $ 268,444

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594 + Details
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