FFIV does not tag a debt maturity schedule in its XBRL, so there is nothing to show here. Many banks and companies without long-term debt leave it out.
Work on FFIV in a spreadsheet:
Excel workbook (a sheet per section, ten years by column, charts, links to the filings) ·
CSV.
For a Google Sheet that stays up to date, paste =IMPORTDATA("https://tickdelta.com/company/FFIV/export.csv") into a cell.