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Goodwill and Intangible Assets - Gross Amount, Accumulated Amortization and Estimated Amortization (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 27, 2021 | Sep. 27, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 87,898 | $ 106,421
Accumulated Amortization | (78,738) | (92,478)
Estimated amortization expense |  |
2021 | 2,093 |
2022 | 4,072 |
2023 | 2,138 |
2024 | 754 |
2025 | 103 |
Total | $ 9,160 | 13,943
Client relations |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Life (in Years) | 2 years 6 months |
Gross Amount | $ 48,444 | 60,775
Accumulated Amortization | $ (42,587) | (53,392)
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Life (in Years) | 8 months 12 days |
Gross Amount | $ 32,292 | 37,682
Accumulated Amortization | $ (30,027) | (32,761)
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Life (in Years) | 1 year 7 months 6 days |
Gross Amount | $ 7,162 | 7,964
Accumulated Amortization | $ (6,124) | $ (6,325)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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