Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2018	Feb. 28, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019
Entity Registrant Name	PERCEPTRON INC/MI
Entity Central Index Key	0000887226
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Trading Symbol	prcp
Entity Common Stock, Shares Outstanding		9,618,469