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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 | Nov. 19, 2018 | Sep. 30, 2020 | Jun. 29, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Goodwill [Line Items] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | $ 1,238,179 | $ 1,182,457
Foreign currency translation adjustments |  |  |  |  | 10,435 | (10,596)
Balance, end of period |  |  | $ 1,625,786 |  | 1,625,786 | 1,238,179
Frustum |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  | $ 53,700 |  |  |  | 53,673
Other Acquisitions |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  | 12,300 | $ 12,600 | 12,262 | 12,645
Onshape |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired | $ 364,900 |  |  |  | 364,910 |
Software Products |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 1,196,064 | 1,152,720
Foreign currency translation adjustments |  |  |  |  | 10,080 | (10,329)
Balance, end of period |  |  | 1,583,316 |  | 1,583,316 | 1,196,064
Software Products | Frustum |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  |  |  |  | 53,673
Software Products | Other Acquisitions |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  |  |  | 12,262 | 0
Software Products | Onshape |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  |  |  | 364,910 |
Professional Services |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 42,115 | 29,737
Foreign currency translation adjustments |  |  |  |  | 355 | (267)
Balance, end of period |  |  | $ 42,470 |  | 42,470 | 42,115
Professional Services | Frustum |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  |  |  |  | 0
Professional Services | Other Acquisitions |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  |  |  | 0 | $ 12,645
Professional Services | Onshape |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, acquired |  |  |  |  | $ 0 |

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