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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 |  |  |  |

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