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Goodwill and Intangible Assets - Finite Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 02, 2017 | Jun. 26, 2016 | Jul. 02, 2017 | Jun. 26, 2016 | Oct. 02, 2016
Finite-lived intangible assets |  |  |  |  |
Gross Amount | $ 117,236 |  | $ 117,236 |  | $ 144,044
Accumulated Amortization | (85,441) |  | (85,441) |  | (95,082)
Amortization expense | 5,600 | $ 6,300 | 17,400 | $ 16,100 |
Estimated amortization expense |  |  |  |  |
2017 | 5,280 |  | 5,280 |  |
2018 | 14,453 |  | 14,453 |  |
2019 | 6,997 |  | 6,997 |  |
2020 | 2,765 |  | 2,765 |  |
2021 | 1,660 |  | 1,660 |  |
Beyond | 640 |  | 640 |  |
Total | 31,795 |  | $ 31,795 |  |
Non-compete agreements |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted-Average Remaining Life (in Years) |  |  | 3 months 18 days |  |
Gross Amount | 484 |  | $ 484 |  | 881
Accumulated Amortization | (477) |  | $ (477) |  | (840)
Client relations |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted-Average Remaining Life (in Years) |  |  | 2 years 9 months 18 days |  |
Gross Amount | 88,940 |  | $ 88,940 |  | 112,367
Accumulated Amortization | (70,572) |  | $ (70,572) |  | (83,514)
Backlog |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted-Average Remaining Life (in Years) |  |  | 1 year 6 months |  |
Gross Amount | 21,252 |  | $ 21,252 |  | 23,018
Accumulated Amortization | (11,377) |  | $ (11,377) |  | (7,536)
Technology and trade names |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |
Weighted-Average Remaining Life (in Years) |  |  | 3 years 4 months 24 days |  |
Gross Amount | 6,560 |  | $ 6,560 |  | 7,778
Accumulated Amortization | $ (3,015) |  | $ (3,015) |  | $ (3,192)

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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=66902209&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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