Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 27, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of changes in 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
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
Acquisitions	74,882		5,294		80,176
Impairment	—		(15,800)		(15,800)
Translation and other	(369)		4,671		4,302
Balance at September 27, 2020	$	516,315	$	477,183	$	993,498

Summary of acquired identifiable intangible assets with finite useful lives

The following table presents 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:

	Fiscal Year Ended
	September 27, 2020					September 29, 2019
	Weighted- Average Remaining Life (in years)	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
	($ in thousands)
Client relations	2.9	$	60,775	$	(53,392)	$	56,779	$	(50,455)
Backlog	0.7	37,682		(32,761)		32,229		(24,968)
Technology and trade names	1.8	7,964		(6,325)		7,714		(4,859)
Total		$	106,421	$	(92,478)	$	96,722	$	(80,282)

Estimated amortization expense for the succeeding five years and beyond

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

	Amount
	(in thousands)
2021	$	8,786
2022	2,652
2023	1,915
2024	590
Total	$	13,943