Document and Entity Information - shares	9 Months Ended
	May 31, 2020	Jun. 30, 2020
Document and Entity Information
Document Type	10-Q
Document Period End Date	May 31, 2020
Entity Registrant Name	CHASE CORP
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		9,442,659
Entity Central Index Key	0000830524
Current Fiscal Year End Date	--08-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false