Document and Entity Information - USD ($)	12 Months Ended
	Aug. 27, 2017	Oct. 23, 2017	Feb. 24, 2017
Document And Entity Information
Entity Registrant Name	WSI INDUSTRIES, INC.
Entity Central Index Key	0000104897
Document Type	10-K
Document Period End Date	Aug. 27, 2017
Amendment Flag	false
Current Fiscal Year End Date	--08-27
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 8,375,000
Entity Common Stock, Shares Outstanding		2,959,940
Trading Symbol	WSCI
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2017