Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in carrying amount of goodwill by segment

The changes in the carrying amount of goodwill by segment for the period from September 30, 2017 to December 30, 2017 are as follows (in thousands):

	OEM Laser Sources		Industrial Lasers & Systems		Total
Balance as of September, 30, 2017	$	102,178	$	315,516	$	417,694
Translation adjustments and other	235		151		386
Balance as of December 30, 2017	$	102,413	$	315,667	$	418,080

Schedule of components of amortizable intangible assets

Components of our amortizable intangible assets are as follows (in thousands):

	December 30, 2017							September 30, 2017
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Existing technology	$	189,282	$	(60,146	)	$	129,136	$	208,341	$	(66,793	)	$	141,548
Patents	—		—			—		330		(58		)	272
Customer relationships	51,708		(16,631		)	35,077		51,687		(14,259		)	37,428
Trade Name	6,172		(2,302		)	3,870		6,171		(1,824		)	4,347
In-process research & development	6,448		—			6,448		6,432		—			6,432
Total	$	253,610	$	(79,079	)	$	174,531	$	272,961	$	(82,934	)	$	190,027

Schedule of estimated amortization expense

At December 30, 2017, estimated amortization expense for the remainder of fiscal 2018, the next five succeeding fiscal years and all fiscal years thereafter are as follows (in thousands):

	Estimated Amortization Expense
2018 (remainder)	$	41,627
2019	53,131
2020	45,583
2021	14,103
2022	3,525
2023	2,615
Thereafter	7,499
Total (excluding IPR&D)	$	168,083