Document and Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2017	Oct. 31, 2017	Feb. 28, 2017
Document and Entity Information
Entity Registrant Name	CHASE CORP
Entity Central Index Key	0000830524
Document Type	10-K
Document Period End Date	Aug. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--08-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 653,152,000
Entity Common Stock, Shares Outstanding		9,364,936
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY