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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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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