Document and Entity Information - shares	9 Months Ended
	May 29, 2016	Jun. 22, 2016
Document And Entity Information
Entity Registrant Name	WSI INDUSTRIES, INC.
Entity Central Index Key	0000104897
Document Type	10-Q
Document Period End Date	May 29, 2016
Amendment Flag	false
Current Fiscal Year End Date	--08-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		2,919,500
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2016