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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Apr. 01, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of changes in the carrying value of goodwill | The following table summarizes the changes in the carrying value of goodwill:
|  | GSG |  | CIG |  | Total
|  | (in thousands)
Balance at October 1, 2017 |  | $ | 361,761 |  |  | $ | 379,125 |  |  | $ | 740,886 |
Goodwill additions |  | 26,726 |  |  | 54,275 |  |  | 81,001 |
Foreign exchange impact |  | (2,138 | ) |  | (10,059 | ) |  | (12,197 | )
Balance at April 1, 2018 |  | $ | 386,349 |  |  | $ | 423,341 |  |  | $ | 809,690 |
Summary of gross amount and accumulated amortization of acquired identifiable intangible assets with finite useful lives | The gross amount and accumulated amortization of our acquired identifiable intangible assets with finite useful lives included in “Intangible assets - net” on our consolidated balance sheets, were as follows:
| April 1, 2018 |  | October 1, 2017
| Weighted- Average Remaining Life (in Years) |  | Gross Amount |  | Accumulated Amortization |  | Gross Amount |  | Accumulated Amortization
| ($ in thousands)
Non-compete agreements | 0.0 |  | $ | 83 |  |  | $ | (83 | ) |  | $ | 495 |  |  | $ | (493 | )
Client relations | 2.7 |  | 54,643 |  |  | (43,119 | ) |  | 90,297 |  |  | (75,074 | )
Backlog | 0.8 |  | 23,184 |  |  | (16,443 | ) |  | 21,518 |  |  | (13,301 | )
Trade names | 2.8 |  | 5,248 |  |  | (2,666 | ) |  | 6,685 |  |  | (3,439 | )
Total |  |  | $ | 83,158 |  |  | $ | (62,311 | ) |  | $ | 118,995 |  |  | $ | (92,307 | )
Schedule of estimated amortization expense for remainder of fiscal and succeeding years | Estimated amortization expense for the remainder of fiscal 2018 and succeeding years is as follows:
| Amount
| (in thousands)
2018 | $ | 8,300 |
2019 | 7,471 |
2020 | 2,786 |
2021 | 1,650 |
2022 | 411 |
Beyond | 229 |
Total | $ | 20,847 |

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- Definition Tabular disclosure of the characteristics, including gross value, accumulated amortization amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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