Document And Entity Information	3 Months Ended
	Nov. 30, 2014	Dec. 19, 2014
Entity Registrant Name	WSI INDUSTRIES, INC.
Entity Central Index Key	0000104897
Current Fiscal Year End Date	--08-31
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 (in shares)		2,908,884
Document Type	10-Q
Document Period End Date	Nov. 30, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	false