Summary of Significant Accounting Policies (Narrative) (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2023 USD ($) Segment	Sep. 30, 2022 USD ($) Segment	Dec. 31, 2021	Sep. 30, 2021 USD ($)	Jun. 30, 2023 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percent of standalone selling price for subscriptions that contains software license			55.00%
Percent of standalone selling price for subscriptions that contains support			45.00%
Contract with customer, total liability			$ 23,700,000	$ 34,200,000
Proceeds from sales of short- and long-term marketable securities		$ 56,200,000	0	0		$ 56,170,000
Marketable securities held			0
Lease expiration date					2037
Development costs for software			0	0		0
Goodwill			3,358,511,000	2,353,654,000		2,191,887,000
IntangibleAssetsNetIncludingGoodwill			4,299,760,000	2,736,372,000
Advertising expense			11,700,000	8,600,000		7,100,000
Cumulative translation adjustment gains (loss)			114,500,000	160,200,000
Pension benefits, before tax			9,600,000	(5,400,000)
Accumulated other comprehensive (income) loss, defined benefit plan, after tax			6,700,000	3,900,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Before Tax			6,900,000	16,900,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Tax			3,100,000	10,600,000
Proceeds From Sale Of Investments			349,000	46,906,000		0
Net income (loss)			$ (245,540,000)	$ (313,081,000)		(476,923,000)
Number of operating segments | Segment			1	2
Purchased Software
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets acquired			$ 1,000,000	$ 6,000,000		600,000
Matterport, Inc.
Summary Of Significant Accounting Policies [Line Items]
Cost method investments						8,700,000
Original investment						8,700,000
Aggregate realized gain				34,000,000
Unrealized Gain Loss On Securities						$ 68,800,000
Matterport, Inc. | Equity Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Cost method investments				8,700,000
Proceeds From Sale Of Investments	$ 42,700,000
Debt and Equity Securities, Gain (Loss)				34,800,000
Original investment				$ 8,700,000
Segment Software Products [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill							$ 3,367,500,000
Professional Services [Member]
Summary Of Significant Accounting Policies [Line Items]
IntangibleAssetsNetIncludingGoodwill							$ 9,800,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Percent of standalone selling price for subscriptions			5.00%
Minimum | Software and Computer Equipment
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			3 years
Minimum | Furniture And Fixtures
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Percent of standalone selling price for subscriptions			50.00%
Maximum | Purchased Software
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			16 years
Maximum | Customer Lists and Relationships
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			20 years
Maximum | Trademarks
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			15 years
Maximum | Software and Computer Equipment
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			5 years
Maximum | Furniture And Fixtures
Summary Of Significant Accounting Policies [Line Items]
Amortization period (in years)			12 years
Not Designated as Hedging Instrument | Foreign Exchange Forward
Summary Of Significant Accounting Policies [Line Items]
Derivative maturity			4 months
Net Investment Hedging | Designated as Hedging Instrument | Foreign Exchange Forward
Summary Of Significant Accounting Policies [Line Items]
Derivative maturity			3 months