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Summary Of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Segment Reporting [Abstract] |  |  |
Number of Reportable Segments | segment | 1 |  |
Advertising |  |  |
Advertising Expense | $ | $ 5.4 | $ 8.9 | $ 15.4
Restricted Stock Units (RSUs) [Member] |  |  |
Restricted Stock Award |  |  |
Award vesting period | 2 years | 2 years | 2 years
Restricted Stock Units (RSUs) [Member] | Annual Equity Program [Member] |  |  |
Restricted Stock Award |  |  |
Percentage Of Annual Performance Stock Grant Based On Achieving Annual Revenue Goal | 50.00% |  |
Percentage Of Annual Performance Stock Grant Based On Achieving Earnings Per Share Goal | 25.00% |  |
Percentage Of Annual Performance Stock Grant Based On Achieving Relative Total Shareholder Return Benchmarked to the S&P 500 Index Goal | 25.00% |  |
Percentage Of Over-Achievement To Which Annual Performance Based Vesting Cannot Exceed | 200.00% |  |
Maintenance [Member] |  |  |
Revenue Recognition |  |  |
Capitalized Contract Cost, Amortization Period | 4 years 6 months |  |
Hardware [Member] |  |  |
Guarantees and Product Warranties |  |  |
Standard Product Warranty Description | one year |  |
Minimum |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property and equipment, useful life | 2 years |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |
Revenue Recognition |  |  |
Revenue, Performance Obligation, Description of Payment Terms | 30 |  |
Restricted Stock Award |  |  |
Award vesting period | 1 year |  |
Minimum | Subscription and Circulation [Member] |  |  |
Revenue Recognition |  |  |
Capitalized Contract Cost, Amortization Period | 3 years |  |
Minimum | Software and Software Development Costs [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property and equipment, useful life | 5 years |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
Revenue Recognition |  |  |
Revenue, Performance Obligation, Description of Payment Terms | 60 |  |
Restricted Stock Award |  |  |
Award vesting period | 4 years |  |
Maximum | Subscription and Circulation [Member] |  |  |
Revenue Recognition |  |  |
Capitalized Contract Cost, Amortization Period | 5 years |  |
Maximum | Software and Software Development Costs [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |

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