Document and Entity Information - shares
 9 Months Ended
May 31, 2016
Jun. 30, 2016
Document and Entity Information    
Entity Registrant Name CHASE CORP  
Entity Central Index Key 0000830524  
Document Type 10-Q  
Document Period End Date May 31, 2016  
Amendment Flag false  
Current Fiscal Year End Date --08-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   9,276,921
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3