Document And Entity Information	9 Months Ended
	May 26, 2013	Jul. 02, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	WSI INDUSTRIES, INC.
Document Type	10-Q
Current Fiscal Year End Date	--08-25
Entity Common Stock, Shares Outstanding		2,904,579
Amendment Flag	false
Entity Central Index Key	0000104897
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	May 26, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3