Document and Entity Information - shares	6 Months Ended
	Feb. 26, 2017	Mar. 22, 2017
Document And Entity Information
Entity Registrant Name	WSI INDUSTRIES, INC.
Entity Central Index Key	0000104897
Document Type	10-Q
Document Period End Date	Feb. 26, 2017
Amendment Flag	false
Current Fiscal Year End Date	--08-28
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		2,919,500
Trading Symbol	WSCI
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2017