Document and Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2020	Oct. 31, 2020	Feb. 29, 2020
Document and Entity Information
Document Type	10-K
Document Period End Date	Aug. 31, 2020
Entity Registrant Name	CHASE CORP
Title of 12(b) Security	Common stock, $.10 par value
Trading Symbol	CCF
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		9,445,474
Entity Central Index Key	0000830524
Current Fiscal Year End Date	--08-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 465,871,000