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Inventories - Narrative (Details) (USD $) In Millions, unless otherwise specified | Nov. 30, 2013 | Aug. 31, 2013 | Nov. 30, 2012
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Inventory Disclosure [Abstract] |  |  |
Percentage of LIFO inventory | 12.00% | 16.00% | 10.00%
LIFO inventory, difference amount had FIFO inventory valuation method been used | $ 498.9 | $ 652.6 | $ 518.5

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- Definition LIFO Inventory, Difference Amount had FIFO Inventory Valuation Method Been Used + References No definition available. + Details
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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