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Summary Of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Oct. 01, 2021
USD ($)
Sep. 30, 2022
USD ($)
segment
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
segment
Segment Reporting [Abstract]        
Number of Reportable Segments | segment   1 1 1
Advertising        
Advertising Expense   $ 15,400,000 $ 10,000,000 $ 7,800,000
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 Annual Increase in Stand-alone Software 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    
Subscription and Circulation [Member]        
Revenue Recognition        
Capitalized Contract Cost, Amortization Period   3 years    
Hardware [Member]        
Guarantees and Product Warranties        
Standard Product Warranty Period   1 year    
Threat Stack, Inc.        
Business Combinations        
Total Purchase Price $ 68,900,000      
Threat Stack, Inc. | Developed Technology Rights        
Business Combinations        
Identifiable intangible assets: $ 11,400,000      
Minimum        
Schedule Of Summary Of Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   2 years    
Property, Plant and Equipment [Abstract]        
Property and equipment, useful life   2 years    
Revenue Recognition        
Accounts Receivable Payment Term Period In Days   30 days    
Restricted Stock Award        
Award vesting period   1 year    
Minimum | Software and Software Development Costs [Member]        
Schedule Of Summary Of Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   3 years    
Maximum        
Schedule Of Summary Of Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   15 years    
Property, Plant and Equipment [Abstract]        
Property and equipment, useful life   5 years    
Revenue Recognition        
Accounts Receivable Payment Term Period In Days   60 days    
Restricted Stock Award        
Award vesting period   4 years    
Maximum | Software and Software Development Costs [Member]        
Schedule Of Summary Of Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   5 years