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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
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 |  |  |  |  | $ 34,200,000 |  | $ 40,300,000 |
Proceeds from sales of short- and long-term marketable securities |  |  | $ 56,200,000 | $ 56,200,000 | 0 |  | 56,170,000 | $ 1,521,000
Allowance for doubtful accounts receivable |  |  |  |  | 400,000 |  | 300,000 | 500,000
Allowance for credit loss, writeoff |  |  |  |  | 400,000 |  | 100,000 | 200,000
Bad debt expense (recoveries) including general and administrative expense, net |  |  |  |  | 500,000 |  | 200,000 | 0.0
Lease expiration date |  |  |  |  |  | 2037 |  |
Development costs for software |  |  |  |  | 0 |  | 0 | 0
Advertising expense |  |  |  |  | 8,600,000 |  | 7,100,000 | 3,800,000
Cumulative translation adjustment gains (loss) |  |  |  |  | 160,200,000 |  | (67,500,000) |
Pension benefits, before tax |  |  |  |  | 5,400,000 |  | (30,200,000) |
Accumulated other comprehensive (income) loss, defined benefit plan, after tax |  |  |  |  | 3,900,000 |  | 21,500,000 |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Before Tax |  |  |  |  | 16,900,000 |  | 6,500,000 |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Tax |  |  |  |  | $ 10,600,000 |  | $ 6,500,000 |
Share price per share |  |  |  |  | $ 0.01 |  | $ 0.01 |
Net income (loss) |  |  |  |  | $ (313,081,000) |  | $ (476,923,000) | $ (130,695,000)
Impairment charges |  |  |  |  | 0 |  | 0 |
Non-marketable equity investments |  |  |  |  | 1,000,000.0 |  | 2,200,000 |
Purchased Software |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | 6,000,000.0 |  | 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 |  |  |  |  | 34,000,000.0 |  |  |
Fair value of shares |  |  |  |  |  |  | 77,500,000 |
Unrealized gain on value of shares |  |  |  |  |  |  | 68,800,000 |
Matterport, Inc. | Equity Securities [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cost method investments |  |  |  |  | 8,700,000 |  |  |
Value of remaining shares held for sale | $ 3,600,000 | $ 39,100,000 |  |  |  |  |  |
Share price per share | $ 7.6 | $ 9.1 |  |  |  |  |  |
Net income (loss) |  |  |  |  | (34,800,000) |  |  |
Original investment |  |  |  |  | $ 8,700,000 |  |  |
Minimum |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Percent of standalone selling price for subscriptions |  |  |  |  | 5.00% |  |  |
Minimum | Computer Hardware And Software |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortization period (in years) |  |  |  |  | 13 years |  |  |
Maximum | Trademarks |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortization period (in years) |  |  |  |  | 12 years |  |  |
Maximum | Computer Hardware And Software |  |  |  |  |  |  |  |
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 |  |  |
ASU 2018-15 | Other Assets |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Capitalized costs |  |  |  |  | $ 14,300,000 |  | $ 2,800,000 |
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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