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Marketable Securities - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Marketable Securities [Abstract] |  |  |  |
Marketable securities held |  | $ 0 |  |
Proceeds from sale of marketable securities | $ 56,200,000 | $ 56,170,000 | $ 1,521,000 | $ 1,507,000

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- Definition Proceeds from sale of marketable securities. + References No definition available. + Details
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Namespace Prefix: | ptc_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration