Cash Surrender Value of Life Insurance (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Cash Surrender Value of Life Insurance
Loans related to life insurance policies	$ 5
Cash surrender value of life insurance, gross	4,530	$ 5,626
Cash surrender value of life insurance, current		(1,096)
Cash surrender value of life insurance, less current portion	4,530	4,530
John Hancock
Cash Surrender Value of Life Insurance
Cash surrender value of life insurance, gross	4,450	4,450
Metropolitan Life Insurance
Cash Surrender Value of Life Insurance
Cash surrender value of life insurance, gross		1,096
Other life insurance carriers
Cash Surrender Value of Life Insurance
Cash surrender value of life insurance, gross	$ 80	$ 80

Represents the current portion of the cash surrender value of Life insurance.

No definition available.

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Namespace Prefix:	ccf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the gross amount of the cash surrender value of life insurance.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	ccf_LifeInsuranceLineItems
Namespace Prefix:	ccf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(e))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(7))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LoansInsurancePolicy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ccf_LifeInsurancePoliciesByInsurerAxis=ccf_JohnHancockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ccf_LifeInsurancePoliciesByInsurerAxis=ccf_MetropolitanLifeInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ccf_LifeInsurancePoliciesByInsurerAxis=ccf_OtherLifeInsuranceCarriersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: