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Document and Entity Information - shares
 9 Months Ended
May 31, 2019
Jul. 03, 2019
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Amendment Flag false  
Document Period End Date May 31, 2019  
Entity File Number 000-06936  
Entity Registrant Name WD 40 CO  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 95-1797918  
Entity Address, Address Line One 9715 Businesspark Avenue  
Entity Address, City or Town San Diego  
Entity Address, Postal Zip Code 92131  
City Area Code 619  
Local Phone Number 275-1400  
Entity Interactive Data Current Yes  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Title of 12(b) Security Common stock, par value $0.001 per share  
Trading Symbol WDFC  
Security Exchange Name NASDAQ  
Entity Central Index Key 0000105132  
Current Fiscal Year End Date --08-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   13,728,723
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Shell Company false  
Entity Address, State or Province CA