Document and Entity Information - shares	6 Months Ended
	Mar. 30, 2019	May 07, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 30, 2019
Entity Registrant Name	PTC Inc.
Entity Central Index Key	0000857005
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		115,041,840