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Deferred Revenue and Related Customer Receivables (Details) - USD ($) $ in Millions | Dec. 30, 2017 | Sep. 30, 2017
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Other Assets |  |
Deferred Revenue and Financing Receivables [Line Items] |  |
Billed but uncollected support and subscription related receivable | $ 110.0 | $ 160.9

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- Definition Deferred Revenue and Financing Receivables [Line Items] + References No definition available. + Details
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Namespace Prefix: | pmtc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_AccountsAndOtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |