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Goodwill and Intangible Assets - Finite Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2019 | Apr. 01, 2018 | Sep. 30, 2018
Finite-lived intangible assets |  |  |  |  |
Gross Amount | $ 87,347 |  | $ 87,347 |  | $ 86,237
Accumulated Amortization | (75,649) |  | (75,649) |  | (70,114)
Amortization expense | 2,200 | $ 5,000 | 6,200 | $ 9,700 |
Estimated amortization expense |  |  |  |  |
2019 | 3,691 |  | 3,691 |  |
2020 | 4,295 |  | 4,295 |  |
2021 | 2,256 |  | 2,256 |  |
2022 | 1,026 |  | 1,026 |  |
2023 | 430 |  | 430 |  |
Total | 11,698 |  | $ 11,698 |  |
Non-compete agreements |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 0 years |  |
Gross Amount | 0 |  | $ 0 |  | 83
Accumulated Amortization | 0 |  | $ 0 |  | (83)
Client relations |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 2 years 7 months 6 days |  |
Gross Amount | 54,277 |  | $ 54,277 |  | 54,639
Accumulated Amortization | (48,733) |  | $ (48,733) |  | (46,449)
Backlog |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 9 months 18 days |  |
Gross Amount | 25,042 |  | $ 25,042 |  | 23,371
Accumulated Amortization | (22,552) |  | $ (22,552) |  | (20,007)
Trade names |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted- Average Remaining Life (in Years) |  |  | 2 years 9 months 18 days |  |
Gross Amount | 8,028 |  | $ 8,028 |  | 8,144
Accumulated Amortization | $ (4,364) |  | $ (4,364) |  | $ (3,575)

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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