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Quarterly Financial Information (Unaudited) - Impacts of the Restatement Adjustments to the Previously Reported Consolidated Statements of Comprehensive Income (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
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Postretirement benefit plan activity | 11,913 | 3,417 | 3,142 | 1,594 | 22,103 | 3,636 | 3,724 | 3,239 | 4,736 | 6,963 | 8,153 | 10,599 | 20,066 | 32,702 | 6,583
Unrealized net gain (loss) on available for sale investments | (16,628) | 6,286 | 3,554 | 3,640 | 2,758 | (118) | 968 | 777 | 7,194 | 1,745 | 13,480 | 1,627 | (3,148) | 4,385 | 1,500
Cash flow hedges | 1,068 | 413 | 1,063 | (4) | 249 | 375 | 964 | 654 | 1,059 | 1,618 | 1,472 | 1,993 | 2,540 | 2,242 | (3,872)
Foreign currency translation adjustment | (1,974) | (10,188) | 2,352 | (2,211) | 3,098 | (1,369) | 8,187 | (18,075) | 141 | (9,888) | (10,047) | (11,257) | (12,021) | (8,159) | (2,904)
Other comprehensive income (loss), net of tax | (5,621) | (72) | 10,111 | 3,019 | 28,208 | 2,524 | 13,843 | (13,405) | 13,130 | 438 | 13,058 | 2,962 | 7,437 | 31,170 | 1,307
Comprehensive income | 234,924 | 181,548 | 176,070 | 190,201 | (46,119) | (69,964) | 28,460 | 189,751 | 366,271 | 218,211 | 547,819 | 148,247 | 782,743 | 102,128 | 384,333
Less comprehensive income attributable to noncontrolling interests | 98 | (187) | (48) | (464) | 123 | (955) | 406 | (208) | (512) | 198 | (699) | (757) | (601) | (634) | (223)
Comprehensive income attributable to CHS Inc. | $ 234,826 | 181,735 | 176,118 | 190,665 | (46,242) | (69,009) | 28,054 | 189,959 | 366,783 | 218,013 | 548,518 | 149,004 | $ 783,344 | 102,762 | 384,556
Postretirement benefit plan, tax expense (benefit) |  | 1,424 | 1,309 | 2,620 | 12,108 | 2,257 | 2,312 | 2,011 | 3,929 | 4,323 | 5,353 | 6,580 |  |  |
Unrealized net gain (loss) on available for sale investments, tax expense (benefit) |  | 2,620 | 1,481 | 404 | 1,722 | (72) | 600 | 482 | 1,885 | 1,083 | 4,505 | 1,010 |  |  |
Cash flow hedges, tax expense (benefit) |  | 172 | 443 | (2) | 155 | 233 | 598 | 406 | 441 | 1,005 | 613 | 1,238 |  |  |
Foreign currency translation adjustment, tax expense (benefit) |  | (254) | 422 | (443) | 542 | (334) | (204) | (209) | (21) | 5 | (275) | (329) |  |  |
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Postretirement benefit plan activity |  | 3,417 | 3,141 | 4,196 | 19,501 | 3,635 | 3,724 | 3,239 | 7,338 | 6,963 | 10,755 | 10,599 |  | 30,100 | 6,583
Unrealized net gain (loss) on available for sale investments |  | 6,286 | 3,554 | 3,640 | 2,758 | (117) | 968 | 777 | 7,194 | 1,744 | 13,480 | 1,627 |  | 4,385 | 1,500
Cash flow hedges |  | 413 | 1,063 | (4) | 249 | 375 | 963 | 654 | 1,059 | 1,618 | 1,472 | 1,993 |  | 2,242 | (3,872)
Foreign currency translation adjustment |  | (11,617) | 2,461 | (2,607) | 3,522 | (2,151) | 9,123 | (19,164) | (146) | (10,041) | (11,763) | (12,193) |  | (8,671) | (1,730)
Other comprehensive income (loss), net of tax |  | (1,501) | 10,219 | 5,225 | 26,030 | 1,742 | 14,778 | (14,494) | 15,445 | 284 | 13,944 | 2,026 |  | 28,056 | 2,481
Comprehensive income |  | 227,645 | 176,845 | 184,844 | (24,522) | (44,398) | 29,751 | 194,448 | 361,690 | 224,199 | 589,335 | 179,801 |  | 155,279 | 426,450
Less comprehensive income attributable to noncontrolling interests |  | (187) | (48) | (464) | 123 | (955) | 406 | (208) | (512) | 198 | (699) | (757) |  | (634) | (223)
Comprehensive income attributable to CHS Inc. |  | 227,832 | 176,893 | 185,308 | (24,645) | (43,443) | 29,345 | 194,656 | 362,202 | 224,001 | 590,034 | 180,558 |  | 155,913 | 426,673
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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)
Postretirement benefit plan activity |  | 0 | 1 | (2,602) | 2,602 | 1 | 0 | 0 | (2,602) | 0 | (2,602) | 0 |  | 2,602 | 0
Unrealized net gain (loss) on available for sale investments |  | 0 | 0 | 0 | 0 | (1) | 0 | 0 | 0 | 1 | 0 | 0 |  | 0 | 0
Cash flow hedges |  | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |  | 0 | 0
Foreign currency translation adjustment |  | 1,429 | (109) | 396 | (424) | 782 | (936) | 1,089 | 287 | 153 | 1,716 | 936 |  | 512 | (1,174)
Other comprehensive income (loss), net of tax |  | 1,429 | (108) | (2,206) | 2,178 | 782 | (935) | 1,089 | (2,315) | 154 | (886) | 936 |  | 3,114 | (1,174)
Comprehensive income |  | (46,097) | (775) | 5,357 | (21,597) | (25,566) | (1,291) | (4,697) | 4,581 | (5,988) | (41,516) | (31,554) |  | (53,151) | (42,117)
Less comprehensive income attributable to noncontrolling interests |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  | 0 | 0
Comprehensive income attributable to CHS Inc. |  | (46,097) | (775) | 5,357 | (21,597) | (25,566) | (1,291) | (4,697) | 4,581 | (5,988) | (41,516) | (31,554) |  | (53,151) | (42,117)
Restatement Adjustments | Freight Derivatives and Related Misstatements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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)
Restatement Adjustments | Other Misstatements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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)
Restatement Adjustments | Freight Derivatives And Related Misstatements, Foreign Currency Impact [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |

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