Document and Entity Information	3 Months Ended
	Nov. 30, 2014	Jan. 02, 2015
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Nov. 30, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	wdfc
Entity Registrant Name	WD 40 CO
Entity Central Index Key	0000105132
Current Fiscal Year End Date	--08-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		14,646,567