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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 2019
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 September 30, 2018 |  | $ | 389,741 |  |  | $ | 409,079 |  |  | $ | 798,820 |
Acquisition activity |  | 38,680 |  |  | — |  |  | 38,680 |
Translation and other |  | (1,751 | ) |  | (8,073 | ) |  | (9,824 | )
Balance at March 31, 2019 |  | $ | 426,670 |  |  | $ | 401,006 |  |  | $ | 827,676 |
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:
| March 31, 2019 |  | September 30, 2018
| Weighted- Average Remaining Life (in Years) |  | Gross Amount |  | Accumulated Amortization |  | Gross Amount |  | Accumulated Amortization
| ($ in thousands)
Non-compete agreements | — |  | $ | — |  |  | $ | — |  |  | $ | 83 |  |  | $ | (83 | )
Client relations | 2.6 |  | 54,277 |  |  | (48,733 | ) |  | 54,639 |  |  | (46,449 | )
Backlog | 0.8 |  | 25,042 |  |  | (22,552 | ) |  | 23,371 |  |  | (20,007 | )
Trade names | 2.8 |  | 8,028 |  |  | (4,364 | ) |  | 8,144 |  |  | (3,575 | )
Total |  |  | $ | 87,347 |  |  | $ | (75,649 | ) |  | $ | 86,237 |  |  | $ | (70,114 | )
Schedule of estimated amortization expense for remainder of fiscal and succeeding years | Estimated amortization expense for the remainder of fiscal 2019 and succeeding years is as follows:
| Amount
| (in thousands)
2019 | $ | 3,691 |
2020 | 4,295 |
2021 | 2,256 |
2022 | 1,026 |
2023 | 430 |
Total | $ | 11,698 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&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://fasb.org/us-gaap/role/ref/legacyRef -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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