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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2017
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 |  | 24,522 |  |  | — |  |  | 24,522 |
Foreign exchange impact |  | (545 | ) |  | (1,408 | ) |  | (1,953 | )
Balance at December 31, 2017 |  | $ | 385,738 |  |  | $ | 377,717 |  |  | $ | 763,455 |
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:
| December 31, 2017 |  | October 1, 2017
| Weighted- Average Remaining Life (in Years) |  | Gross Amount |  | Accumulated Amortization |  | Gross Amount |  | Accumulated Amortization
| ($ in thousands)
Non-compete agreements | 0.0 |  | $ | 85 |  |  | $ | (85 | ) |  | $ | 495 |  |  | $ | (493 | )
Client relations | 2.8 |  | 54,940 |  |  | (41,700 | ) |  | 90,297 |  |  | (75,074 | )
Backlog | 1.1 |  | 21,896 |  |  | (13,530 | ) |  | 21,518 |  |  | (13,301 | )
Trade names | 3.0 |  | 5,311 |  |  | (2,384 | ) |  | 6,685 |  |  | (3,439 | )
Total |  |  | $ | 82,232 |  |  | $ | (57,699 | ) |  | $ | 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 | $ | 12,413 |
2019 | 7,027 |
2020 | 2,799 |
2021 | 1,654 |
2022 | 411 |
Beyond | 229 |
Total | $ | 24,533 |

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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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