Income Taxes (Summary Of The Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Sep. 30, 2017
Deferred tax assets
Accrued compensation and benefits	$ 10,660	$ 13,841
Inventory reserves	4,787	6,550
Other assets	4,255	4,920
Allowance for doubtful accounts	1,196	1,766
Net operating loss carryovers	516	227
State and foreign tax credit carryovers	1,252	3,358
Research and development tax credit carryovers	3,337	2,231
Total deferred tax asset before valuation allowance	26,003	32,893
Less valuation allowance	(4,792)	(3,487)
Total deferred tax assets	21,211	29,406
Deferred tax liabilities
Property and equipment	10,210	13,382
Foreign deferred revenue and other	4,649	3,009
Intangible assets	48,019	83,207
Deferred Tax Liabilities, Derivatives	1,566	1,233
Total deferred tax liabilities	64,444	100,831
Net deferred tax liabilities, net	$ (43,233)	$ (71,425)