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Goodwill and Acquired Intangible Assets - Schedule of Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Goodwill [Line Items] |  |  |  |
Balance, beginning of period |  |  | $ 1,625,786 | $ 1,238,179
Foreign currency translation adjustments |  |  | 1,900 | 10,435
Balance, end of period |  | $ 1,625,786 | 2,191,887 | 1,625,786
Onshape |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired | $ 364,900 |  |  | 364,910
Other Acquisitions |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  | 12,300 | 581 | 12,262
Arena Acquisition |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  | 563,620 |
Software Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance, beginning of period |  |  | 1,583,316 | 1,196,064
Foreign currency translation adjustments |  |  | 1,851 | 10,080
Balance, end of period |  | 1,583,316 | 2,148,968 | 1,583,316
Software Products | Onshape |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  |  | 364,910
Software Products | Other Acquisitions |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  | 181 | 12,262
Software Products | Arena Acquisition |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  | 563,620 |
Professional Services |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance, beginning of period |  |  | 42,470 | 42,115
Foreign currency translation adjustments |  |  | 49 | 355
Balance, end of period |  | $ 42,470 | 42,919 | 42,470
Professional Services | Onshape |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  |  | 0
Professional Services | Other Acquisitions |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  | 400 | $ 0
Professional Services | Arena Acquisition |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired |  |  | $ 0 |

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