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Stock-based Compensation - Schedule of Classification of Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | $ 59,382 | $ 54,032 | $ 185,848 | $ 161,395
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | 22,593 | 15,894 | 66,624 | 49,678
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | 15,043 | 17,788 | 49,115 | 48,334
Location, Statement of Income, Balance [Axis]: us-gaap:SellingAndMarketingExpense |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | 16,143 | 15,059 | 51,373 | 46,672
License | Location, Statement of Income, Balance [Axis]: ptc:CostOfLicenseRevenue |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | 61 | 176 | 267 | 282
Support and cloud services | Location, Statement of Income, Balance [Axis]: ptc:CostOfSupportAndCloudServicesRevenue |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | 4,086 | 4,122 | 13,548 | 12,092
Professional services | Location, Statement of Income, Balance [Axis]: ptc:CostOfProfessionalServicesRevenue |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense | $ 1,456 | $ 993 | $ 4,921 | $ 4,337

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