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Goodwill and Intangible Assets - Finite Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Oct. 01, 2017
Finite-lived intangible assets |  |  |  |  |
Gross Amount | $ 82,254 |  | $ 82,254 |  | $ 118,995
Accumulated Amortization | (66,876) |  | (66,876) |  | (92,307)
Amortization expense | 5,200 | $ 5,600 | 14,900 | $ 17,400 |
Estimated amortization expense |  |  |  |  |
2018 | 4,043 |  | 4,043 |  |
2019 | 6,295 |  | 6,295 |  |
2020 | 2,758 |  | 2,758 |  |
2021 | 1,642 |  | 1,642 |  |
2022 | 411 |  | 411 |  |
Beyond | 229 |  | 229 |  |
Total | 15,378 |  | $ 15,378 |  |
Non-compete agreements |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 0 years |  |
Gross Amount | 81 |  | $ 81 |  | 495
Accumulated Amortization | (81) |  | $ (81) |  | (493)
Client relations |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 2 years 7 months 6 days |  |
Gross Amount | 54,446 |  | $ 54,446 |  | 90,297
Accumulated Amortization | (44,589) |  | $ (44,589) |  | (75,074)
Trade names |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 9 months 18 days |  |
Gross Amount | 22,620 |  | $ 22,620 |  | 21,518
Accumulated Amortization | (19,301) |  | $ (19,301) |  | (13,301)
Trade names |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 2 years 6 months |  |
Gross Amount | 5,107 |  | $ 5,107 |  | 6,685
Accumulated Amortization | $ (2,905) |  | $ (2,905) |  | $ (3,439)

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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