Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 28, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

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

	Goodwill
Balance at September 28, 2018	$	327,982
Acquired goodwill	—
Translation adjustments	(1,126		)
Balance at December 28, 2018	$	326,856

Schedule of Finite-Lived Intangible Assets

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

	December 28, 2018							September 28, 2018
Intangible Assets	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Acquired patents and technology	$	330,705	$	(158,107	)	$	172,598	$	319,082	$	(152,775	)	$	166,307
Customer relationships	58,327		(41,812		)	16,515		58,342		(41,012		)	17,330
Other intangibles	22,723		(22,360		)	363		22,742		(22,360		)	382
Total	$	411,755	$	(222,279	)	$	189,476	$	400,166	$	(216,147	)	$	184,019

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 2018
Q1 - Quarter ended December 29, 2017	$12.0	14.1
Fiscal 2019
Q1 - Quarter ended December 28, 2018	$12.1	11.6

(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 December 28, 2018, estimated amortization expense in future fiscal periods was as follows (in thousands):

Fiscal Year	Amortization Expense
	(in thousands)
Remainder of 2019	$	21,402
2020	28,227
2021	28,201
2022	25,630
2023	22,284
Thereafter	63,732
Total	$	189,476