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Operating Segments and Geographic Data (Schedule Of Concentration Of Revenue From Individual Geographic Regions) (Details) | 12 Months Ended
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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. + References No definition available. + Details
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