Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Sep. 02, 2016	Dec. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2016
Entity Registrant Name	PERCEPTRON INC/MI
Entity Central Index Key	0000887226
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		9,370,996
Entity Current Reporting Status	Yes
Entity Public Float			$ 69
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Trading Symbol	prcp