Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 29, 2019

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 1, 2017	$	361,761		$	379,125		$	740,886
Acquisitions	27,526			58,353			85,879
Divestiture	—			(12,160		)	(12,160		)
Translation and other	454			(16,239		)	(15,785		)
Balance at September 30, 2018	389,741			409,079			798,820
Acquisitions	53,098			93,601			146,699
Impairment	—			(7,755		)	(7,755		)
Translation and other	(1,037		)	(11,907		)	(12,944		)
Balance at September 29, 2019	$	441,802		$	483,018		$	924,820

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 29, 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	2.8	56,779		(50,455		)	54,639		(46,449		)
Backlog	1.2	32,229		(24,968		)	23,371		(20,007		)
Technology and trade names	2.3	7,714		(4,859		)	8,144		(3,575		)
Total		$	96,722	$	(80,282	)	$	86,237	$	(70,114	)

Estimated amortization expense for the succeeding five years and beyond

Estimated amortization expense for the succeeding four years is as follows:

	Amount
	(in thousands)
2020	$	9,401
2021	4,551
2022	1,602
2023	886
Total	$	16,440