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Income Taxes (Reconciliation Of Federal Statutory Tax Rate To Our Effective Tax Rate) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00% |
State income taxes, net of federal effect | 0.20% | 0.20% | 0.30% |
Stock-based compensation expense rate |  |  | 1.20% |
Stock-based compensation expense rate | 3.50% | 1.10% |  |
Research and development tax credits | (5.10%) | (2.70%) | (2.70%) |
Tax exempt interest | (1.40%) | (1.30%) | (2.30%) |
U.S. tax on foreign entities | 1.30% | 1.30% | 1.30% |
Foreign rate differential | (1.20%) | (2.10%) | (1.90%) |
Audit settlements | (2.70%) | 0.60% | 1.90% |
Tax Act of 2017 | 0.00% | (3.20%) | 0.00% |
Other | (0.10%) | 0.50% | 0.60% |
Effective tax rate | 15.50% | 15.40% | 19.40% |
Income tax benefit | $ (46,993) | $ (48,163) | $ (48,409) |
Lapse of statute of limitations | 19,088 | 7,318 | 0 |
Unrecognized Tax Benefits | 83,666 | $ 81,615 | $ 76,304 | $ 69,682
Unrecognized tax benefits if recognized, would affect our effective tax rate | $ 28,100 |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.1.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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