Document And Entity Information (USD $)	12 Months Ended
	Jun. 30, 2013	Sep. 20, 2013	Dec. 31, 2012
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2013
Entity Registrant Name	PERCEPTRON INC/MI
Entity Central Index Key	0000887226
Current Fiscal Year End Date	--06-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		8,832,608
Entity Current Reporting Status	Yes
Entity Public Float			$ 47,200,000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No