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Equities Changes in Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 37 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2015 | May. 31, 2014 | Jun. 30, 2017 | Jan. 30, 2015 | Sep. 30, 2014 | Aug. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | $ 385,096 |  |  |  |  |
Patronage distribution |  |  | (277,020) |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | (114,048) |  |  |  |  |
Equities issued |  |  | 989,728 |  |  |  |  |
Dividends, Preferred Stock |  |  | (105,223) |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | (430) |  |  |  |  |
Other, net |  |  | (4,380) |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 177,835 | $ 379,873 | 649,063 | $ 883,522 |  |  |  |
Net income attributable to CHS Inc. | 178,050 | 379,455 | 649,567 | 881,710 |  |  |  |
Net income (loss) attributable to noncontrolling interests | (215) | 418 | (504) | 1,812 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 2,128 | $ 6,198 | (3,510) | $ (2,368) |  |  |  |
Patronage Refunds, Estimated |  |  | (174,600) |  |  |  |  |
Equity redemptions, estimate |  |  | (90,100) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 7,721,420 |  | 7,721,420 |  |  |  |  | $ 6,466,844
Capital equity certificates [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | (276,966) |  |  |  |  |
Patronage distribution |  |  | 396,443 |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | (113,484) |  |  |  |  |
Equities issued |  |  | 12,365 |  |  |  |  |
Other, net |  |  | (243) |  |  |  |  |
Equity redemptions, estimate |  |  | (90,100) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 3,436,488 |  | 3,436,488 |  |  |  |  | 3,508,473
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | (430) |  |  |  |  |
Other, net |  |  | (6,177) |  |  |  |  |
Net income (loss) attributable to noncontrolling interests |  |  | (504) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 11,225 |  | 11,225 |  |  |  |  | 18,336
Nonpatronage Equity Certificates [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | 0 |  |  |  |  |
Patronage distribution |  |  | 0 |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | (131) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 23,125 |  | 23,125 |  |  |  |  | 23,256
Non-qualified Equity Certificates [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | (148,579) |  |  |  |  |
Patronage distribution |  |  | 147,715 |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | (453) |  |  |  |  |
Other, net |  |  | (606) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 282,776 |  | 282,776 |  |  |  |  | 284,699
Preferred Stock [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | 0 |  |  |  |  |
Patronage distribution |  |  | 0 |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | 0 |  |  |  |  |
Equities issued |  |  | 977,363 |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 2,167,540 |  | 2,167,540 |  |  |  |  | 1,190,177
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | 0 |  |  |  |  |
Patronage distribution |  |  | 0 |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | 0 |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  | (3,510) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (160,267) |  | (160,267) |  |  |  |  | (156,757)
Capital Reserves [Member] |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  | 810,641 |  |  |  |  |
Patronage distribution |  |  | (821,178) |  |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value |  |  | $ 20 |  |  |  |  |
Equities issued |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  | $ (105,223) |  |  |  |  |
Other, net |  |  | 2,646 |  |  |  |  |
Net income attributable to CHS Inc. |  |  | 649,567 |  |  |  |  |
Patronage Refunds, Estimated |  |  | (174,600) |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,960,533 |  | 1,960,533 |  |  |  |  | $ 1,598,660
Class B, Series 4 Preferred Stock [Member] |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  |  |  |  | $ 517,500 |  |
Proceeds from Issuance of Preferred Stock, net of Issuance Costs |  |  | $ 501,000 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 7.50% |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  | 20,700,000 |  |
Class B Preferred Stock [Member] |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Value of Preferred Stock available to be sold under Shelf Registration |  |  |  |  | $ 2,000,000 |  |  |
Class B, Series 3 Preferred Stock [Member] |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  |  |  |  |  | $ 492,500 |
Proceeds from Issuance of Preferred Stock, net of Issuance Costs |  |  | $ 476,700 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 6.75% |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  | 19,700,000 |
London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 3 Preferred Stock [Member] |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Basis Spread on Dividend Rate Percentage |  |  | 4.155% |  |  |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 3 Preferred Stock [Member] |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Basis Spread on Dividend Rate Percentage |  |  | 8.00% |  |  |  |  |

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