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Fair Value Measurements (Contingent Consideration Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | $ 1,575 | $ 8,400
Contingent consideration at acquisition |  | 2,100
Payment of contingent consideration | (1,575) | (8,925)
Contingent consideration, ending balance | 0 | 1,575
Kepware [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | 0 | 8,400
Contingent consideration at acquisition |  | 0
Payment of contingent consideration | 0 | (8,400)
Contingent consideration, ending balance | 0 | 0
Other [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | 1,575 | 0
Contingent consideration at acquisition |  | 2,100
Payment of contingent consideration | (1,575) | (525)
Contingent consideration, ending balance | $ 0 | $ 1,575

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- Definition Business Combination, Contingent Consideration, Liabilities + References No definition available. + Details
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Namespace Prefix: | pmtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contingent Consideration Liability, Fair Value Disclosure + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition payment of contingent consideration + References No definition available. + Details
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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |