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Operating Segments and Geographic Data (Schedule Of Concentration Of Revenue From Individual Geographic Regions) (Details)	12 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 29, 2023
Revenue from External Customer [Line Items]
Document Period End Date	Sep. 26, 2025
Concentration of revenue from individual geographic regions	100.00%	100.00%	100.00%
United States
Revenue from External Customer [Line Items]
Concentration of revenue from individual geographic regions	37.00%	35.00%	36.00%
South Korea [Member]
Revenue from External Customer [Line Items]
Concentration of revenue from individual geographic regions	12.00%	13.00%	14.00%
China [Member]
Revenue from External Customer [Line Items]
Concentration of revenue from individual geographic regions	26.00%	22.00%	22.00%
Japan [Member]
Revenue from External Customer [Line Items]
Concentration of revenue from individual geographic regions	7.00%	8.00%	9.00%
Europe [Member]
Revenue from External Customer [Line Items]
Concentration of revenue from individual geographic regions	9.00%	12.00%	10.00%
Other [Member]
Revenue from External Customer [Line Items]
Concentration of revenue from individual geographic regions	9.00%	10.00%	9.00%

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- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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- Definition

Concentration Of Revenue From Individual Geographic Regions

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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