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Equities Changes in Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	May 31, 2021	Feb. 28, 2021	Nov. 30, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	May 31, 2021	May 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 8,719,783	$ 8,785,856	$ 8,819,173	$ 8,623,956	$ 8,622,916	$ 8,617,530	$ 8,819,173	$ 8,617,530
Reversal of prior year patronage and redemption estimates	29,139	26,135	7,726	77,438	93,387	5,447
patronage refund	(8,625)	(21,416)		(82)	(90,030)
Redemptions of equities	(25,323)	(4,760)	(7,726)	(77,438)	(3,387)	(5,447)
Preferred stock dividends		(42,167)	(84,334)		(42,167)	(84,334)
ASC Topic 842 cumulative effect adjustment						33,707
Other, net	(1,984)	666	(8,661)	(606)	(512)	(949)
Net income (loss)	273,672	(38,358)	69,369	97,501	125,694	178,737	304,683	401,932
Net income (loss) attributable to CHS Inc.	273,591			97,648			305,033	400,977
Net income (loss) attributable to noncontrolling interests	81			(147)			(350)	955
Other comprehensive income, net of tax	7,115	2,549	8,917	(2,009)	(10,585)	(1,638)	18,581	(14,232)
Estimated 2021 cash patronage refunds	(21,292)	5,639	(9,304)	13,551	(22,206)	(28,504)
Estimated 2021 equity redemptions	(21,292)	5,639	(9,304)	47,975	(49,154)	(91,633)
Ending Balance	8,951,193	8,719,783	8,785,856	8,780,286	8,623,956	8,622,916	8,951,193	8,780,286
Capital equity certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	3,721,612	3,715,416	3,724,187	3,613,612	3,662,578	3,753,493	3,724,187	3,753,493
Reversal of prior year patronage and redemption estimates	15,514	4,760	7,726	67,438	3,387	5,447
Redemptions of equities	(19,275)	(4,177)	(6,539)	(64,273)	(2,998)	(4,721)
Other, net	(298)	(26)	(654)	(1,544)	(201)	(8)
Estimated 2021 equity redemptions	(21,292)	5,639	(9,304)	47,975	(49,154)	(91,633)
Ending Balance	3,696,261	3,721,612	3,715,416	3,663,208	3,613,612	3,662,578	3,696,261	3,663,208
Nonpatronage Equity Certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	28,614	28,649	28,727	29,000	29,020	29,074	28,727	29,074
Reversal of prior year patronage and redemption estimates	0	0	0	0	0	0
Redemptions of equities	(35)	(35)	(31)	(91)	(20)	(54)
Other, net	43		(47)	(7)
Ending Balance	28,622	28,614	28,649	28,902	29,000	29,020	28,622	28,902
Non-qualified Equity Certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,409,530	1,407,343	1,408,696	1,206,901	1,205,599	1,206,310	1,408,696	1,206,310
Reversal of prior year patronage and redemption estimates	5,000	(211,970)	0	10,000	(472,398)	0
patronage refund	7	214,720		327	474,066
Redemptions of equities	(6,013)	(548)	(1,156)	(13,074)	(369)	(672)
Other, net	58	(15)	(197)	(116)	3	(39)
Ending Balance	1,408,582	1,409,530	1,407,343	1,204,038	1,206,901	1,205,599	1,408,582	1,204,038
Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038
Redemptions of equities	0	0	0	0	0	0
Ending Balance	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038	2,264,038
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(222,458)	(225,007)	(233,924)	(239,156)	(228,571)	(226,933)	(233,924)	(226,933)
Other comprehensive income, net of tax	7,115	2,549	8,917	(2,009)	(10,585)	(1,638)
Ending Balance	(215,343)	(222,458)	(225,007)	(241,165)	(239,156)	(228,571)	(215,343)	(241,165)
Capital Reserves [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,509,902	1,586,382	1,618,147	1,740,983	1,681,597	1,584,158	1,618,147	1,584,158
Reversal of prior year patronage and redemption estimates	8,625	233,345	0		562,398	0
patronage refund	(8,632)	(236,136)		(409)	(564,096)
Preferred stock dividends		(42,167)	(84,334)		(42,167)	(84,334)
Other, net	(1,726)	1,068	(7,798)	1,053	10	(1,312)
Net income (loss) attributable to CHS Inc.	273,591	(38,229)	69,671	97,648	125,447	177,882
Estimated 2021 cash patronage refunds	(21,292)	5,639	(9,304)	13,551	(22,206)	(28,504)
Ending Balance	1,760,468	1,509,902	1,586,382	1,852,826	1,740,983	1,681,597	1,760,468	1,852,826
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	8,545	9,035	9,302	8,578	8,655	7,390	9,302	7,390
Other, net	(61)	(361)	35	8	(324)	410
Net income (loss) attributable to noncontrolling interests	81	(129)	(302)	(147)	247	855
Ending Balance	$ 8,565	$ 8,545	$ 9,035	$ 8,439	$ 8,578	8,655	$ 8,565	$ 8,439
Accounting Standards Update 2016-02 [Member] | Capital equity certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						0
Accounting Standards Update 2016-02 [Member] | Nonpatronage Equity Certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						0
Accounting Standards Update 2016-02 [Member] | Non-qualified Equity Certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						0
Accounting Standards Update 2016-02 [Member] | Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						0
Accounting Standards Update 2016-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						0
Accounting Standards Update 2016-02 [Member] | Capital Reserves [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						33,707
Accounting Standards Update 2016-02 [Member] | Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC Topic 842 cumulative effect adjustment						$ 0

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