| Component: (Network and Table) | |
|---|---|
| Network | 2401404 - Disclosure - Summary Of Significant Accounting Policies (Schedule Of Inventories) (Details) (http://www.f5.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfInventoriesDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0001048695 (http://www.sec.gov/CIK) |
| Accounting Policies [Abstract] | Period [Axis] | |
|---|---|---|
2016-09-30 | 2015-09-30 | |
Accounting Policies [Abstract] | ||
Finished goods | ||
Raw materials | ||
Inventories, Total | 34,051,000 | 33,717,000 |