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Goodwill and Intangible Assets - Finite Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Finite-lived intangible assets |  |  |
Gross Amount | $ 85,020 |  | $ 86,237
Accumulated Amortization | (73,036) |  | (70,114)
Amortization expense | 4,000 | $ 4,600 |
Estimated amortization expense |  |  |
2019 | 4,954 |  |
2020 | 3,331 |  |
2021 | 2,249 |  |
2022 | 1,021 |  |
2023 | 429 |  |
Total | $ 11,984 |  |
Non-compete agreements |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 0 years |  |
Gross Amount | $ 0 |  | 83
Accumulated Amortization | $ 0 |  | (83)
Client relations |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 2 years 7 months 6 days |  |
Gross Amount | $ 54,057 |  | 54,639
Accumulated Amortization | $ (47,534) |  | (46,449)
Trade names |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 4 months 24 days |  |
Gross Amount | $ 22,991 |  | 23,371
Accumulated Amortization | $ (21,544) |  | (20,007)
Trade names |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 3 years |  |
Gross Amount | $ 7,972 |  | 8,144
Accumulated Amortization | $ (3,958) |  | $ (3,575)

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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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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- 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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