Goodwill and Intangible Assets (Tables)

6 Months Ended

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