Goodwill and Intangible Assets (Tables)

9 Months Ended

Jun. 30, 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			20,078			58,758
Translation and other	(581		)	(5,376		)	(5,957		)
Balance at June 30, 2019	$	427,840		$	423,781		$	851,621

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:

	June 30, 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	2.5	54,483		(49,791		)	54,639		(46,449		)
Backlog	0.7	26,075		(23,623		)	23,371		(20,007		)
Trade names	2.6	7,956		(4,662		)	8,144		(3,575		)
Total		$	88,514	$	(78,076	)	$	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	$	1,873
2020	4,871
2021	2,246
2022	1,020
2023	428
Total	$	10,438