Income Taxes (Schedule Of Tax Effects To Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Net operating loss carry-forwards	$ 12,269	$ 11,540
Allowance for doubtful accounts	587	368
Accrued compensation and benefits	13,478	8,202
Inventories and related reserves	526	324
Stock-based compensation	7,144	5,570
Deferred revenue	35,247	29,290
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent	17,313	3,662
Other accruals and reserves	14,673	10,747
Tax credit carryforwards	13,783	12,177
Depreciation	592	671
Total deferred tax assets before deferred liabilities	115,612	82,551
Valuation allowance	(23,495)	(22,780)
Deferred tax assets, net of valuation allowance	92,117	59,771
Purchased intangibles and other	(10,560)	(10,678)
Depreciation	(39,910)	(12,277)
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs	10,656	0
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	3,603	3,410
Total deferred tax liabilities	(64,729)	(26,365)
Net deferred tax assets	$ 27,388	$ 33,406