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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Sep. 30, 2025 USD ($) Segment | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2021
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 | $ 39,700,000 | $ 26,000,000 |  |
Lease expiration date |  |  |  | 2037
Development costs for software | 0 | 0 | $ 0 |
Impairment of goodwill | 0 |  |  |
Advertising expense | 11,700,000 | 15,000,000 | 11,700,000 |
Cumulative translation adjustment gains (loss) | 40,800,000 | 78,100,000 |  |
Pension benefits, before tax | 13,600,000 | 15,200,000 |  |
Accumulated other comprehensive (income) loss, defined benefit plan, after tax | 9,400,000 | 10,500,000 |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Before Tax | 38,500,000 | 14,800,000 |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Tax | 31,000,000 | 13,100,000 |  |
Impairment charge | $ 15,600,000 |  |  |
Number of operating segments | Segment | 1 |  |  |
Number of Reportable Segments | Segment | 1 |  |  |
Purchased Software |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets acquired | $ 0 | $ 4,100,000 | $ 1,000,000 |
Right-of-Use Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Impairment charge | 12,800,000 |  |  |
Fixed Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Impairment charge | $ 2,800,000 |  |  |
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 |  |  |
Not Designated as Hedging Instrument | Foreign Exchange Option |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Derivative maturity | 14 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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