Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

The following table outlines changes to the carrying amount of goodwill (in thousands):



	Goodwill
Balance at September 29, 2017	$	311,087
Acquired goodwill	4,807
Translation adjustments	664
Balance at March 30, 2018	$	316,558

Schedule of Finite-Lived Intangible Assets

Intangible assets subject to amortization consist of the following (in thousands):



	March 30, 2018							September 29, 2017
Intangible Assets	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Acquired patents and technology	$	315,125	$	(141,355	)	$	173,770	$	299,707	$	(128,986	)	$	170,721
Customer relationships	56,866		(39,713		)	17,153		56,843		(38,368		)	18,475
Other intangibles	22,770		(22,353		)	417		22,742		(22,290		)	452
Total	$	394,761	$	(203,421	)	$	191,340	$	379,292	$	(189,644	)	$	189,648

With regard to our purchase of intangible assets during the periods presented, the following table summarizes the consideration paid, the weighted-average useful lives over which the acquired assets will be amortized using the greater of either the straight-line basis or a ratio-to-revenue method, and the classification of their amortized expense in our consolidated statements of operations:



Fiscal Period	Total Purchase Consideration (1)	Weighted-Average Useful Life
	(in millions)	(in years)
Fiscal 2017
Q1 - Quarter ended December 30, 2016	None
Q2 - Quarter ended March 31, 2017	5.3	18.0
	$5.3	18.0
Fiscal 2018
Q1 - Quarter ended December 29, 2017	$12.0	14.1
Q2 - Quarter ended March 30, 2018	$2.8	5.3
	$14.8	12.5

(1) Amortization expense on the intangible assets from patent portfolio and business acquisitions is included within cost of revenue, R&D, and G&A in our consolidated statements of operations.

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

As of March 30, 2018, estimated amortization expense in future fiscal periods was as follows (in thousands):



Fiscal Year	Amortization Expense
Remainder of 2018	$	13,468
2019	26,415
2020	25,952
2021	25,926
2022	23,261
Thereafter	76,318
Total	$	191,340