Acquisitions - Additional Information (Details) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 15, 2021 USD ($) Employee	Nov. 01, 2019 USD ($) Employee	Jun. 30, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 27, 2020 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)
Business Acquisition [Line Items]
Business combination, acquisition related costs			$ 600	$ 700	$ 14,800	$ 8,100
Borrowings under credit facility					600,000	$ 455,000
Deferred tax liabilities			11,541		11,541			$ 12,431
Deferred revenue			460,836		460,836			416,804
Accounts receivable			$ 432,980		432,980			$ 415,221
Arena Solutions
Business Acquisition [Line Items]
Payments to acquire business, net of cash	$ 715,000
Cash acquired from acquisition	$ 11,100
Entity number of employees | Employee	170
Goodwill, acquired	$ 562,800				$ 562,838
Deferred tax liabilities	41,300
Deferred revenue	15,500
Accounts receivable	11,400
Liabilities	400
Arena Solutions | Customer Lists
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 155,000
Acquired finite-lived intangible asset, weighted average useful life	13 years
Arena Solutions | Purchased Software
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 38,300
Acquired finite-lived intangible asset, weighted average useful life	9 years
Arena Solutions | Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 4,200
Acquired finite-lived intangible asset, weighted average useful life	12 years
Arena Solutions | Forecast
Business Acquisition [Line Items]
Expected revenue							$ 30,000
Fair value adjustments related to purchase accounting for acquisition							$ 10,000
Arena Solutions | Line of Credit
Business Acquisition [Line Items]
Borrowings under credit facility	$ 600,000
Onshape
Business Acquisition [Line Items]
Payments to acquire business, net of cash		$ 469,000
Cash acquired from acquisition		$ 7,500
Entity number of employees | Employee		110
Goodwill, acquired		$ 364,900
Liabilities		4,100
Onshape | Customer Lists
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 56,800
Acquired finite-lived intangible asset, weighted average useful life		10 years
Onshape | Purchased Software
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 47,300
Acquired finite-lived intangible asset, weighted average useful life		16 years
Onshape | Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 3,600
Acquired finite-lived intangible asset, weighted average useful life		15 years