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Inventories - Narrative (Details) (USD $) In Millions, unless otherwise specified	Feb. 28, 2013	Aug. 31, 2012	Feb. 29, 2012
Inventory Disclosure [Abstract]
Percentage of LIFO inventory	14.00%	11.00%	16.00%
LIFO inventory, difference amount had FIFO inventory valuation method been used	$ 535.1	$ 566.6	$ 636.8

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- Definition

LIFO Inventory, Difference Amount had FIFO Inventory Valuation Method Been Used

+ References

No definition available.

+ Details

Name:	chscp_LifoInventoryDifferenceAmountHadFifoInventoryValuationMethodBeenUsed
Namespace Prefix:	chscp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

+ References

No definition available.

+ Details

Name:	us-gaap_PercentageOfLIFOInventory
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant