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Organization and Significant Accounting Policies - Stock-Based Compensation, Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Stock-based compensation | $ 18,982 | $ 14,662 | $ 11,602
Stock-based compensation after tax | $ 15,000 | $ 11,100 | $ 8,400

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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