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Commitments And Contingencies (Narrative) (Details)
ft² in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2006
ft²
Sep. 30, 2018
USD ($)
ft²
building
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Commitments And Contingencies [Line Items]        
Number of buildings in the amended and restated lease | building   4    
Lease expiration date   Dec. 31, 2022    
Rent expense under non-cancelable operating leases | $   $ 30.0 $ 30.2 $ 30.1
Contract manufacturers' purchase obligations | $   $ 26.2    
333 Elliott West [Member]        
Commitments And Contingencies [Line Items]        
Office space in a building for which lease agreement is entered | ft² 137      
F5 Tower [Member]        
Commitments And Contingencies [Line Items]        
Office space in a building for which lease agreement is entered | ft²   515    
Lessee, Operating Lease, Term of Contract   14 years 6 months    
Earliest Commencement of Lease   Apr. 01, 2019    
Time After Substantial Completion Date of Construction Latest Date for Commencement of Lease   10 months    
Pending Litigation [Member] | F5 Counterclaim of Radware, Ltd. and Radware, Inc. Patent Infringement Complaint [Member]        
Commitments And Contingencies [Line Items]        
Gain Contingency, Patents Allegedly Infringed upon, Number   3