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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance, beginning of year	$ 205,423	$ 177,663	$ 141,950
Net release of valuation allowance	(134,235)	0	(1,772)
Net increase (decrease) in deferred tax assets with a full valuation allowance	(19,103)	27,760	37,485
Valuation allowance, end of year	$ 52,085	$ 205,423	$ 177,663

X

- Definition

Valuation Allowance, Net Increase (Decrease) In Deferred Tax Assets For Jurisdictions With A Full Valuation Allowance

+ References

No definition available.

+ Details

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Namespace Prefix:	ptc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation allowance, Release of valuation allowance

+ References

No definition available.

+ Details

Name:	ptc_ValuationAllowanceReleaseOfValuationAllowance
Namespace Prefix:	ptc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_MovementInValuationAllowancesAndReservesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration