Income Taxes (Reconciliation From The Federal Statutory Income Tax Rate To The Effective Income Tax Rate) (Details)	12 Months Ended
Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	21.00%	24.50%	35.00%
Impact from foreign operations	10.00%	3.00%	(10.00%)
State income taxes, net of federal benefit	1.00%	0.00%	(1.00%)
R&D tax credits	(15.00%)	(10.00%)	(22.00%)
Domestic production activities deduction / foreign derived intangible income	(5.00%)	(2.00%)	(10.00%)
Impact of U.S. Tax Act	(0.02)	(0.57)	0
Acquisition costs	0.00%	0.00%	(3.00%)
Nondeductible stock option expense and other permanent items	1.00%	2.00%	2.00%
Effective income tax rate	11.40%	(38.70%)	(9.00%)

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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