Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands		6 Months Ended
Nov. 01, 2019	Mar. 28, 2020
Goodwill [Line Items]
Balance, October 1, 2019		$ 1,238,179
Foreign currency translation adjustment		(8)
Balance, March 28, 2020		1,603,081
Software Products
Goodwill [Line Items]
Balance, October 1, 2019		1,196,064
Foreign currency translation adjustment		(8)
Balance, March 28, 2020		1,560,966
Professional Services
Goodwill [Line Items]
Balance, October 1, 2019		42,115
Foreign currency translation adjustment		0
Balance, March 28, 2020		42,115
Onshape [Member]
Goodwill [Line Items]
Goodwill, acquired	$ 364,900	364,910
Onshape [Member] \| Software Products
Goodwill [Line Items]
Goodwill, acquired		364,910
Onshape [Member] \| Professional Services
Goodwill [Line Items]
Goodwill, acquired		$ 0

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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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