CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net unrealized gain (loss) on restricted investments, tax	$ 30	$ 4	$ (77)
Change in funded status of pension plans, tax	$ 519	$ (738)	$ (697)

Represents the amount of tax expense (benefit) of change in funded status of pension plan.

No definition available.

Name:	ccf_OtherComprehensiveIncomeLossChangeInFundedStatusOfPensionPlanTax
Namespace Prefix:	ccf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration