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Goodwill and Intangible Assets - Finite Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Oct. 01, 2017
Finite-lived intangible assets |  |  |
Gross Amount | $ 82,232 |  | $ 118,995
Accumulated Amortization | (57,699) |  | (92,307)
Amortization expense | 4,600 | $ 5,900 |
Estimated amortization expense |  |  |
2018 | 12,413 |  |
2019 | 7,027 |  |
2020 | 2,799 |  |
2021 | 1,654 |  |
2022 | 411 |  |
Beyond | 229 |  |
Total | $ 24,533 |  |
Non-compete agreements |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 0 years |  |
Gross Amount | $ 85 |  | 495
Accumulated Amortization | $ (85) |  | (493)
Client relations |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 2 years 9 months 18 days |  |
Gross Amount | $ 54,940 |  | 90,297
Accumulated Amortization | $ (41,700) |  | (75,074)
Backlog |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 1 year 1 month 6 days |  |
Gross Amount | $ 21,896 |  | 21,518
Accumulated Amortization | $ (13,530) |  | (13,301)
Trade names |  |  |
Finite-lived intangible assets |  |  |
Weighted- Average Remaining Life (in Years) | 3 years |  |
Gross Amount | $ 5,311 |  | 6,685
Accumulated Amortization | $ (2,384) |  | $ (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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -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 after 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 No definition available. + Details
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