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Document and Entity Information
 9 Months Ended
May 31, 2012
Jul. 05, 2012
Document And Entity Information [Abstract]    
Entity Registrant Name WD 40 CO  
Entity Central Index Key 0000105132  
Document Type 10-Q  
Document Period End Date May 31, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --08-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   15,787,109