Restatement of Previously Issued Financial Information - Summary of Impacts of the Restatement Adjustments on Previously Reported Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	$ 8,484,289	$ 8,031,884
Cost of goods sold	8,013,648	7,711,392
Gross profit	470,641	320,492
Marketing, general and administrative	162,496	140,346
Reserve and impairment charges (recoveries), net		(3,787)
Operating earnings (loss)	314,498	183,933
Interest Expense	38,908	40,702
Other (income) loss	(25,134)	(26,195)
Equity (income) loss from investments	(66,508)	(38,362)
Income (loss) before income taxes	367,232	207,788
Income tax expense (benefit)	20,117	20,606
Net income (loss)	347,115	187,182
Net income (loss) attributable to noncontrolling interests	(389)	(464)
Net income (loss) attributable to CHS Inc.	$ 347,504	187,646
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		8,048,889
Cost of goods sold		7,735,627
Gross profit		313,262
Marketing, general and administrative		140,168
Reserve and impairment charges (recoveries), net		(3,787)
Operating earnings (loss)		176,881
Interest Expense		40,702
Other (income) loss		(25,014)
Equity (income) loss from investments		(38,362)
Income (loss) before income taxes		199,555
Income tax expense (benefit)		19,936
Net income (loss)		179,619
Net income (loss) attributable to noncontrolling interests		(464)
Net income (loss) attributable to CHS Inc.		180,083
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		(17,005)
Cost of goods sold		(24,570)
Gross profit		7,565
Marketing, general and administrative		(668)
Reserve and impairment charges (recoveries), net		0
Operating earnings (loss)		8,233
Interest Expense		0
Other (income) loss		0
Equity (income) loss from investments		0
Income (loss) before income taxes		8,233
Income tax expense (benefit)		670
Net income (loss)		7,563
Net income (loss) attributable to CHS Inc.		7,563
As Restated
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		8,031,884
Cost of goods sold		7,711,057
Gross profit		320,827
Marketing, general and administrative		139,500
Reserve and impairment charges (recoveries), net		(3,787)
Operating earnings (loss)		185,114
Interest Expense		40,702
Other (income) loss		(25,014)
Equity (income) loss from investments		(38,362)
Income (loss) before income taxes		207,788
Income tax expense (benefit)		20,606
Net income (loss)		187,182
Net income (loss) attributable to noncontrolling interests		(464)
Net income (loss) attributable to CHS Inc.		187,646
Revisions related to ASU 2017-07
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of goods sold		335
Gross profit		(335)
Marketing, general and administrative		846
Operating earnings (loss)		(1,181)
Other (income) loss		$ (1,181)