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Restatement of Previously Issued Consolidated Financial Statements - Summary of Impacts of the Restatement Adjustments on Previously Reported Consolidated Statements of Changes in Equities (Details) - USD ($) $ in Thousands | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | Aug. 31, 2015
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 8,165,028 | $ 7,920,836 | $ 7,866,357 | $ 7,742,948 | $ 7,705,640 | $ 7,680,371 | $ 7,808,580 | $ 7,819,516 | $ 7,759,159 | $ 7,551,439
As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  | 8,162,533 | 8,061,960 | 7,937,775 | 7,905,825 | 7,858,956 | 7,961,594 | 7,931,280 | 7,866,250 | 7,669,411
Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  | (241,697) | (195,603) | (194,827) | (200,185) | (178,585) | (153,014) | (111,764) | (107,091) | (117,972)
Capital Equity Certificates |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 3,837,580 |  |  |  | 3,906,426 |  |  |  | 3,918,711 | 3,793,897
Capital Equity Certificates | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 3,906,426 |  |  |  | 3,932,513 | 3,793,897
Capital Equity Certificates | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 0 |  |  |  | (13,802) | 0
Nonpatronage Equity Certificates |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 29,498 |  |  |  | 29,836 |  |  |  | 22,894 | 23,057
Nonpatronage Equity Certificates | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 29,836 |  |  |  | 22,894 | 23,057
Nonpatronage Equity Certificates | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 0 |  |  |  | 0 | 0
Nonqualified Equity Certificates |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 742,378 |  |  |  | 405,387 |  |  |  | 281,767 | 282,928
Nonqualified Equity Certificates | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 405,387 |  |  |  | 281,767 | 282,928
Nonqualified Equity Certificates | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 0 |  |  |  | 0 | 0
Preferred Stock |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 2,264,038 |  |  |  | 2,264,038 |  |  |  | 2,244,132 | 2,167,540
Preferred Stock | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 2,264,038 |  |  |  | 2,244,132 | 2,167,540
Preferred Stock | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 0 |  |  |  | 0 | 0
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | (199,915) |  |  |  | (180,360) |  |  |  | (211,530) | (212,837)
Accumulated Other Comprehensive Loss | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | (183,670) |  |  |  | (211,726) | (214,207)
Accumulated Other Comprehensive Loss | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 3,310 |  |  |  | 196 | 1,370
Capital Reserves |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 1,482,003 |  |  |  | 1,267,808 |  |  |  | 1,488,999 | 1,485,433
Capital Reserves | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 1,471,217 |  |  |  | 1,582,380 | 1,604,670
Capital Reserves | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | (203,409) |  |  |  | (93,381) | (119,237)
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 9,446 |  |  |  | 12,505 |  |  |  | 14,186 | 11,421
Noncontrolling Interests | As Previously Reported |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | 12,591 |  |  |  | 14,290 | 11,526
Noncontrolling Interests | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | (86) |  |  |  | (104) | (105)
Freight Derivatives and Related Misstatements | Cumulative restatement adjustments |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  | $ (209,200) | $ 185,900 | $ (163,200) | $ (162,400) | $ 136,800 | $ (114,700) | $ (114,000) | $ (115,700) | $ (104,600)

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