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Restatement of Previously Issued Consolidated Financial Statements - Summary of Impacts of the Restatement Adjustments on Previously Reported Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 240,545 | $ 181,620 | $ 165,959 | $ 187,182 | $ (74,327) | $ (72,488) | $ 14,617 | $ 203,156 | $ 353,141 | $ 217,773 | $ 534,761 | $ 145,285 | $ 775,306 | $ 70,958 | $ 383,026 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 478,050 | 480,223 | 447,492 |
Amortization of deferred major repair costs |  |  |  |  |  |  |  |  |  |  |  |  | 61,686 | 67,058 | 73,483 |
Equity (income) loss from investments | (16,404) | (59,308) | (39,441) | (38,362) | (12,817) | (48,393) | (35,800) | (40,328) | (77,803) | (76,128) | (137,111) | (124,521) | (153,515) | (137,338) | (175,777) |
Distributions from equity investments |  |  |  |  |  |  |  |  |  |  |  |  | 190,297 | 213,352 | 178,464 |
Provision for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  | 2,085 | 177,969 | 57,200 |
(Gain) loss on disposal of business | (61) | (124,050) | (7,705) | 0 | 704 | (1,224) | (1,395) | 4,105 | (7,705) | 2,710 | (131,755) | 1,486 | (131,816) | 2,190 | 0 |
Unrealized (gain) loss on crack spread contingent liability |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (15,051) | (60,931) |
Long-lived asset impairment, net of recoveries |  |  |  |  |  |  |  |  |  |  |  |  | (10,352) | 145,042 | 27,247 |
Reserve against supplier advance payments |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 130,705 | 0 |
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  | (146,961) | (194,467) | 28,190 |
Other, net |  |  |  |  |  |  |  |  |  |  |  |  | 6,653 | 20,173 | (15,444) |
Changes in operating assets and liabilities, net of acquisitions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  |  |  |  |  |  |  |  |  | 210,775 | 146,788 | 1,570 |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  | (169,581) | (333,479) | 353,572 |
Derivative assets |  |  |  |  |  |  |  |  |  |  |  |  | (102,368) | 114,023 | 29,822 |
Margin and related deposits |  |  |  |  |  |  |  |  |  |  |  |  | 54,912 | 97,804 | (30,705) |
Supplier advance payments |  |  |  |  |  |  |  |  |  |  |  |  | (39,189) | (33,952) | 43,415 |
Other current assets and other assets |  |  |  |  |  |  |  |  |  |  |  |  | (13,450) | (50,729) | 128,603 |
Customer margin deposits and credit balances |  |  |  |  |  |  |  |  |  |  |  |  | (20,518) | (50,920) | 20,841 |
Customer advance payments |  |  |  |  |  |  |  |  |  |  |  |  | (14,682) | (1,329) | (7,079) |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  | (78,388) | 227,967 | (129,587) |
Derivative liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 132,495 | (132,423) | 1,443 |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 40,629 | (25,446) | (94,291) |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  | 1,072,068 | 919,118 | 1,260,554 |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | (355,412) | (444,397) | (692,780) |
Proceeds from disposition of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 91,153 | 19,541 | 13,417 |
Expenditures for major repairs |  |  |  |  |  |  |  |  |  |  |  |  | (80,514) | (2,340) | (19,610) |
Investments in joint ventures and other |  |  |  |  |  |  |  |  |  |  |  |  | (21,679) | (16,645) | (2,855,218) |
Changes in CHS Capital notes receivable, net |  |  |  |  |  |  |  |  |  |  |  |  | 25,335 | 322 | (209,902) |
Financing extended to customers |  |  |  |  |  |  |  |  |  |  |  |  | (74,402) | (67,225) | (82,302) |
Payments from customer financing |  |  |  |  |  |  |  |  |  |  |  |  | 52,453 | 88,154 | 35,188 |
Other investing activities, net |  |  |  |  |  |  |  |  |  |  |  |  | 48,628 | 17,549 | 64,236 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  | (79,524) | (405,041) | (3,746,971) |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit and long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 36,040,240 | 37,295,236 | 31,586,968 |
Payments on lines of credit, long-term borrowings and capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  | (36,525,136) | (37,584,011) | (29,232,842) |
Mandatorily redeemable noncontrolling interest payments |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (153,022) |
Preferred stock dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | (168,668) | (167,642) | (163,324) |
Redemptions of equities |  |  |  |  |  |  |  |  |  |  |  |  | (8,847) | (35,268) | (23,911) |
Cash patronage dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (103,879) | (251,740) |
Other financing activities, net |  |  |  |  |  |  |  |  |  |  |  |  | (69,759) | (22,694) | 52,067 |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  |  | (732,170) | (618,258) | 1,814,196 |
Effect of exchange rate changes on cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 8,864 | (4,713) | (5,223) |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 269,238 | (108,894) | (677,444) |
Cash and cash equivalents at beginning of period | 533,887 | 219,273 | 249,767 | 181,379 | 266,748 | 276,137 | 516,646 | 290,273 | 181,379 | 290,273 | 181,379 | 290,273 | 181,379 | 290,273 | 967,717 |
Cash and cash equivalents at end of period | 450,617 | 533,887 | 219,273 | 249,767 | 181,379 | 266,748 | 276,137 | 516,646 | 219,273 | 276,137 | 533,887 | 266,748 | 450,617 | 181,379 | 290,273 |
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 229,146 | 166,626 | 179,619 | (50,552) | (46,140) | 14,973 | 208,942 | 346,245 | 223,915 | 575,391 | 177,775 |  | 127,223 | 423,969 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 480,223 | 447,492 |
Amortization of deferred major repair costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,058 | 73,483 |
Equity (income) loss from investments |  | (59,308) | (39,441) | (38,362) | (12,817) | (48,393) | (35,800) | (40,328) | (77,803) | (76,128) | (137,111) | (124,521) |  | (137,338) | (175,777) |
Distributions from equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 213,352 | 178,464 |
Provision for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  |  | 177,969 | 57,200 |
(Gain) loss on disposal of business |  | (124,050) | (7,705) |  | 0 | 0 | 0 | 0 | (7,705) | 0 | (131,755) | 0 |  | 0 | 0 |
Unrealized (gain) loss on crack spread contingent liability |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,051) | (60,931) |
Long-lived asset impairment, net of recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,042 | 27,247 |
Reserve against supplier advance payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 130,705 | 0 |
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (175,914) | (24,178) |
Other, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,044 | (15,444) |
Changes in operating assets and liabilities, net of acquisitions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  | 121,630 | 46,405 |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  | (293,549) | 338,662 |
Derivative assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 126,824 | (20,257) |
Margin and related deposits |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,214 | (37,115) |
Supplier advance payments |  |  |  |  |  |  |  |  |  |  |  |  |  | (34,583) | 44,047 |
Other current assets and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (66,119) | 120,993 |
Customer margin deposits and credit balances |  |  |  |  |  |  |  |  |  |  |  |  |  | (50,920) | 20,841 |
Customer advance payments |  |  |  |  |  |  |  |  |  |  |  |  |  | (528) | 5,664 |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,445 | (129,259) |
Derivative liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (183,287) | 36,283 |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,446) | (94,291) |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 932,994 | 1,263,498 |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | (444,397) | (692,780) |
Proceeds from disposition of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,541 | 13,417 |
Expenditures for major repairs |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,340) | (19,610) |
Investments in joint ventures and other |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,645) | (2,855,218) |
Changes in CHS Capital notes receivable, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 322 | (209,902) |
Financing extended to customers |  |  |  |  |  |  |  |  |  |  |  |  |  | (67,225) | (82,302) |
Payments from customer financing |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,154 | 35,188 |
Other investing activities, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,549 | 64,236 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (405,041) | (3,746,971) |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit and long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,295,236 | 31,586,968 |
Payments on lines of credit, long-term borrowings and capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  | (37,580,959) | (29,232,842) |
Mandatorily redeemable noncontrolling interest payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (153,022) |
Preferred stock dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  | (167,642) | (163,324) |
Redemptions of equities |  |  |  |  |  |  |  |  |  |  |  |  |  | (35,268) | (23,911) |
Cash patronage dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  | (103,879) | (251,740) |
Other financing activities, net |  |  |  |  |  |  |  |  |  |  |  |  |  | (28,681) | 52,067 |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (621,193) | 1,814,196 |
Effect of exchange rate changes on cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,694) | (5,223) |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | (97,934) | (674,500) |
Cash and cash equivalents at beginning of period | 533,887 | 190,426 | 252,129 | 181,379 | 267,229 | 249,801 | 515,484 | 279,313 | 181,379 | 279,313 | 181,379 | 279,313 | 181,379 | 279,313 | 953,813 |
Cash and cash equivalents at end of period |  | 533,887 | 190,426 | 252,129 | 181,379 | 267,229 | 249,801 | 515,484 | 190,426 | 249,801 | 533,887 | 267,229 |  | 181,379 | 279,313 |
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (47,526) | (667) | 7,563 | (23,775) | (26,348) | (356) | (5,786) | 6,896 | (6,142) | (40,630) | (32,490) |  | (56,265) | (40,943) |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Amortization of deferred major repair costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Equity (income) loss from investments |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  | 0 | 0 |
Distributions from equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Provision for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
(Gain) loss on disposal of business |  | 0 | 0 |  | 704 | (1,224) | (1,395) | 4,105 | 0 | 2,710 | 0 | 1,486 |  | 2,190 | 0 |
Unrealized (gain) loss on crack spread contingent liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Long-lived asset impairment, net of recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Reserve against supplier advance payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,553) | 52,368 |
Other, net |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,871) | 0 |
Changes in operating assets and liabilities, net of acquisitions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,158 | (44,835) |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  | (39,930) | 14,910 |
Derivative assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,801) | 50,079 |
Margin and related deposits |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,410) | 6,410 |
Supplier advance payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 631 | (632) |
Other current assets and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,390 | 7,610 |
Customer margin deposits and credit balances |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Customer advance payments |  |  |  |  |  |  |  |  |  |  |  |  |  | (801) | (12,743) |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,522 | (328) |
Derivative liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,864 | (34,840) |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,876) | (2,944) |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Proceeds from disposition of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Expenditures for major repairs |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Investments in joint ventures and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Changes in CHS Capital notes receivable, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Financing extended to customers |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Payments from customer financing |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Other investing activities, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit and long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Payments on lines of credit, long-term borrowings and capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,052) | 0 |
Mandatorily redeemable noncontrolling interest payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Preferred stock dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Redemptions of equities |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Cash patronage dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Other financing activities, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,987 | 0 |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,935 | 0 |
Effect of exchange rate changes on cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | (19) | 0 |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,960) | (2,944) |
Cash and cash equivalents at beginning of period | $ 0 | 28,847 | (2,362) | 0 | (481) | 26,336 | 1,162 | 10,960 | 0 | 10,960 | 0 | 10,960 | $ 0 | 10,960 | 13,904 |
Cash and cash equivalents at end of period |  | 0 | 28,847 | (2,362) | 0 | (481) | 26,336 | 1,162 | 28,847 | 26,336 | 0 | (481) |  | 0 | 10,960 |
Freight Derivatives and Related Misstatements | Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (24,700) | (22,600) | (1,200) | (25,200) | (22,800) | 200 | 600 | (23,800) | 800 | (48,500) | (22,100) |  | (47,300) | (9,900) |
Other Misstatements | Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ (22,800) | 21,900 | $ 8,800 | 1,400 | $ (3,600) | (600) | (6,400) | 30,700 | (6,900) | $ 7,900 | $ (10,400) |  | (9,000) | (31,000) |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Gain) loss on disposal of business |  |  |  |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  | (3,100) |  |  |  |  |  |  |  |  | (3,100) |  |
Cash |  |  | $ 28,800 |  | 11,000 |  | $ 24,800 |  | $ 28,800 | $ 24,800 |  |  |  | 11,000 | $ 2,900 | $ 13,900
Other Misstatements, Timing Difference | Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ 6,000 |  |  |  |  |  |  |  |  | $ 6,000 |  |

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