Income Taxes (Reconciliation Of The Provision For Income Taxes) (Details) - USD ($) $ in Thousands		12 Months Ended
Oct. 01, 2017	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Domestic		$ 1,126	$ 136,308	$ 135,589
Foreign		4,291	90,644	46,590
Earnings before income taxes		$ 5,417	$ 226,952	$ 182,179
Federal statutory income tax rate	35.00%	21.00%	21.00%	24.50%
Impacts of Tax Act		(0.964)	0.004	0.169
Revaluation of deferred taxes		(0.216)	(0.002)	(0.060)
Withholding taxes		27.50%	1.00%	4.10%
Reversal of indefinite reinvestment assertion		(2.90%)	0.60%	5.70%
R&D and foreign tax credits		(102.80%)	(2.10%)	(4.30%)
Foreign tax rates		76.00%	2.30%	(0.70%)
Equity-based compensation		(6.50%)	(0.70%)	(0.70%)
Change in valuation allowance for deferred taxes		21.10%	(0.70%)	5.70%
State taxes, net of federal benefit		(1.90%)	1.40%	1.90%
Other		16.60%	0.10%	0.60%
Effective income tax rate		(69.90%)	23.10%	47.70%

Effective Income Tax Rate Reconciliation, Change In Indefinite Reinvestment Assertion

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Effective Income Tax Rate Reconciliation, Withholding Taxes

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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 changes in the valuation allowance for deferred tax assets.

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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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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 increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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