Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of carrying value of goodwill

The following table summarizes the changes in the carrying value of goodwill:

	GSG		CIG			Total
	(in thousands)
Balance at October 2, 2016	$	357,050	$	360,938		$	717,988
Acquisition activity	—		7,055			7,055
Translation and other	4,711		11,132			15,843
Balance at October 1, 2017	361,761		379,125			740,886
Acquisition activity	27,526		58,353			85,879
Divestiture activity	—		(12,160		)	(12,160		)
Translation and other	454		(16,239		)	(15,785		)
Balance at September 30, 2018	$	389,741	$	409,079		$	798,820

Summary 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 the consolidated balance sheets, were as follows:

	Fiscal Year Ended
	September 30, 2018						October 1, 2017
	Weighted- Average Remaining Life (in years)	Gross Amount		Accumulated Amortization			Gross Amount		Accumulated Amortization
	($ in thousands)
Non-compete agreements	0.0	$	83	$	(83	)	$	495	$	(493	)
Client relations	2.6	54,639		(46,449		)	90,297		(75,074		)
Backlog	0.5	23,371		(20,007		)	21,518		(13,301		)
Technology and trade names	3.2	8,144		(3,575		)	6,685		(3,439		)
Total		$	86,237	$	(70,114	)	$	118,995	$	(92,307	)

Estimated amortization expense for the succeeding five years and beyond

Estimated amortization expense for the succeeding five years and beyond is as follows:

	Amount
	(in thousands)
2019	$	9,016
2020	3,366
2021	2,271
2022	1,037
2023	433
Total	$	16,123