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Equities Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2014 | May 31, 2016 | May 31, 2015 | May 31, 2016 | May 31, 2015 | Aug. 31, 2015 | Jan. 30, 2015 | Sep. 30, 2014
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, Value available for issuance |  |  |  |  | $ 990,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | 344,051 |  |  |  |
Patronage Refunds |  |  |  |  | 253,150 |  |  |  |
Redemptions of equities |  |  |  |  | (93,872) |  |  |  |
Equities issued, net |  |  |  |  | 99,631 |  |  |  |
Dividends, Preferred Stock |  |  |  |  | (122,382) |  |  |  |
Other, net |  |  |  |  | (1,786) |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  | $ 189,683 | $ 177,835 | 425,675 | $ 649,063 |  |  |
Net income (loss) attributable to CHS Inc. |  |  | 190,275 | 178,050 | 425,767 | 649,567 |  |  |
Net income (loss) attributable to noncontrolling interests |  |  | (592) | (215) | (92) | (504) |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  | 14,914 | $ 2,128 | 413 | (3,510) |  |  |
Patronage Refunds, Estimated |  |  |  |  | (102,818) |  |  |  |
Equity redemptions, estimate |  |  |  |  | (98,546) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 7,866,627 |  | 7,866,627 |  | $ 7,669,411 |  |
Stock Redeemed or Called During Period, Price per Share | $ 28.50 |  |  |  |  |  |  |  |
Capital equity certificates [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value | $ 76,800 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | (281,393) |  |  |  |
Patronage Refunds |  |  |  |  | (375,504) |  |  |  |
Redemptions of equities |  |  |  |  | (93,292) |  |  |  |
Equities issued, net |  |  |  |  | 23,035 |  |  |  |
Other, net |  |  |  |  | 297 |  |  |  |
Equity redemptions, estimate |  |  |  |  | (98,546) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 3,719,502 |  | 3,719,502 |  | 3,793,897 |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  | 3,557 |  |  |  |
Net income (loss) attributable to noncontrolling interests |  |  |  |  | (92) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 14,991 |  | 14,991 |  | 11,526 |  |
Nonpatronage Equity Certificates [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | 0 |  |  |  |
Patronage Refunds |  |  |  |  | 0 |  |  |  |
Redemptions of equities |  |  |  |  | (97) |  |  |  |
Other, net |  |  |  |  | (21) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 22,939 |  | 22,939 |  | 23,057 |  |
Non-qualified Equity Certificates [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | 0 |  |  |  |
Patronage Refunds |  |  |  |  | 0 |  |  |  |
Redemptions of equities |  |  |  |  | (483) |  |  |  |
Other, net |  |  |  |  | (316) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 282,129 |  | 282,129 |  | 282,928 |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | 0 |  |  |  |
Patronage Refunds |  |  |  |  | 0 |  |  |  |
Redemptions of equities |  |  |  |  | 0 |  |  |  |
Equities issued, net |  |  |  |  | 76,596 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 2,244,136 |  | 2,244,136 |  | 2,167,540 |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | 0 |  |  |  |
Patronage Refunds |  |  |  |  | 0 |  |  |  |
Redemptions of equities |  |  |  |  | 0 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  | 413 | $ (3,510) |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | (213,794) |  | (213,794) |  | (214,207) |  |
Capital Reserves [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Reversal of prior year patronage and redemption estimates |  |  |  |  | 625,444 |  |  |  |
Patronage Refunds |  |  |  |  | 628,654 |  |  |  |
Redemptions of equities |  |  |  |  | 0 |  |  |  |
Dividends, Preferred Stock |  |  |  |  | (122,382) |  |  |  |
Other, net |  |  |  |  | (5,303) |  |  |  |
Net income (loss) attributable to CHS Inc. |  |  |  |  | 425,767 |  |  |  |
Patronage Refunds, Estimated |  |  |  |  | (102,818) |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | $ 1,796,724 |  | $ 1,796,724 |  | 1,604,670 |  |
Class B, Series 4 Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount | $ 67,300 |  |  |  |  |  |  | $ 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, Series 1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 7.785% |  |  |  |
Preferred Stock, Shares Issued | 2,693,195 |  |  |  |  |  |  |  |
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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