Acquisitions and Disposition of Business - Additional Information (Details)				3 Months Ended			9 Months Ended
	Jun. 01, 2022 USD ($) Employees	Apr. 29, 2022 USD ($) Employees	Jan. 15, 2021 USD ($) Employee	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Business Acquisition [Line Items]
Business combination, acquisition and transaction related costs				$ 6,400,000		$ 600,000	$ 11,300,000	$ 14,800,000
Payments to acquire business, net of cash acquired							274,974,000	717,779,000
Borrowings under credit facility							264,000,000	600,000,000
Revenue				462,474,000		$ 435,668,000	1,425,422,000	$ 1,326,504,000
Deferred tax liabilities				24,362,000			24,362,000		$ 4,165,000
Deferred revenue				481,360,000			481,360,000		482,131,000
Accounts receivable				473,298,000			473,298,000		541,072,000
Goodwill				2,382,680,000			2,382,680,000		2,191,887,000
Liabilities				$ 2,448,368,000			$ 2,448,368,000		$ 2,469,092,000
Arena Solutions
Business Acquisition [Line Items]
Payments to acquire business			$ 715,000,000
Cash acquired from acquisition			$ 11,100,000
Number Of Employees | Employee			170
Revenue					$ 29,800,000
Fair value adjustments related to purchase accounting for acquisition					$ 9,100,000
Goodwill, acquired			$ 562,800,000
Deferred tax liabilities			41,300,000
Deferred revenue			15,500,000
Accounts receivable			11,400,000
Liabilities			400,000
Arena Solutions | Customer Lists
Business Acquisition [Line Items]
Finite-lived intangible assets acquired			$ 155,000,000.0
Acquired finite-lived intangible asset, weighted average useful life			13 years
Arena Solutions | Purchased Software
Business Acquisition [Line Items]
Finite-lived intangible assets acquired			$ 38,300,000
Acquired finite-lived intangible asset, weighted average useful life			9 years
Arena Solutions | Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets acquired			$ 4,200,000
Acquired finite-lived intangible asset, weighted average useful life			12 years
Arena Solutions | Line of Credit
Business Acquisition [Line Items]
Borrowings under credit facility			$ 600,000,000
Intland Software
Business Acquisition [Line Items]
Payments to acquire business		$ 277,200,000
Payments to acquire business, net of cash acquired		274,800,000
Borrowings under credit facility		$ 264,000,000
Number Of Employees | Employees		150
Goodwill, acquired		$ 240,000,000.0
Deferred tax liabilities		20,800,000
Deferred revenue		6,900,000
Accounts receivable		6,500,000
Liabilities		800,000
Intland Software | Customer Lists
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 38,800,000
Acquired finite-lived intangible asset, weighted average useful life		11 years
Intland Software | Purchased Software
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 19,100,000
Acquired finite-lived intangible asset, weighted average useful life		10 years
Intland Software | Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 1,300,000
Acquired finite-lived intangible asset, weighted average useful life		10 years
PLM Services Business Disposition
Business Acquisition [Line Items]
Number Of Employees | Employees	160
Liabilities	$ 2,400,000
Cash Consideration	32,500,000
Gain On Sale	29,800,000
Net Assets	(30,600)
Goodwill	33,000,000.0
Total consideration	60,400,000
Contingent Consideration	20,000,000
PLM Services Business Disposition | Service To Be Performed [Member]
Business Acquisition [Line Items]
Non cash consideration	$ 28,000,000.0