Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2019	Nov. 07, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
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		9,692,378
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.01 par value
Entity File Number	0-20206
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	38-2381442
Entity Address, Address Line One	47827 Halyard Drive
Entity Address, City or Town	Plymouth
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48170-2461
City Area Code	734
Local Phone Number	414-6100
Document Quarterly Report	true
Document Transition Report	false
Security Exchange Name	NASDAQ