Other Assets - Rollforward of Capitalized Maintenance Activity (Details) - USD ($) $ in Thousands	12 Months Ended
Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Capitalized Maintenance Expense [Roll Forward]
Cost Deferred	$ 3,010	$ 949	$ 219,898
Amortization	(67,058)	(73,483)	(45,953)
Capitalized major maintenance	$ 105,006	$ 169,054	$ 241,588	$ 67,643

Capitalized Maintenance Expense, Deferred During the Period

No definition available.

Name:	chscp_CapitalizedMaintenanceExpenseDeferredDuringPeriod
Namespace Prefix:	chscp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration