Goodwill and Intangible Assets (Tables)

3 Months Ended

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