Document And Entity Information	3 Months Ended
	Nov. 27, 2011	Dec. 28, 2011
Entity Information
Entity Registrant Name	WSI INDUSTRIES, INC.
Entity Central Index Key	0000104897
Current Fiscal Year End Date	--08-28
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding		2,896,080
Document Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Nov. 27, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q1