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Leases And Rental Expense (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 24, 2022 | Sep. 25, 2021 | Sep. 26, 2020
Leases and Rental Expense [Abstract] |  |  |
Initial terms of leases | 20 years |  |
Rent expense for all operating leases | $ 10.9 | $ 11.1 | $ 11.1
Operating sub-lease rental income | 0.3 | $ 0.3 | $ 0.3
Lease extension exercised, increase in operating lease assets and liabilities | $ 7.9 |  |
Weighted average remaining lease term | 13 years 4 months 24 days |  |
Weighted average discount rate | 3.51% |  |

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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