Goodwill and Intangible Assets (Tables)

12 Months Ended

Oct. 01, 2016

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 fiscal 2016 and 2015 are as follows (in thousands):

	Commercial Lasers and Components (1)		Specialty Laser Systems (2)			Total
Balance as of September 27, 2014	$	6,363	$	103,150		$	109,513
Additions (see Note 3)	—		1,119			1,119
Translation adjustments and other	—		(8,815		)	(8,815		)
Balance as of October 3, 2015	6,363		95,454			101,817
Additions (see Note 3)	—		434			434
Translation adjustments and other	—		(793		)	(793		)
Balance as of October 1, 2016	$	6,363	$	95,095		$	101,458

(1) Gross amount of goodwill for our CLC segment was $25.7 million at both October 1, 2016 and October 3, 2015. At both October 1, 2016 and October 3, 2015, the accumulated impairment loss for the CLC reporting unit was $19.3 million reflecting an impairment charge in fiscal 2009.

(2) Gross amount of goodwill for our SLS segment was $97.4 million and $97.8 million at October 1, 2016 and October 3, 2015. At both October 1, 2016 and October 3, 2015, the accumulated impairment loss for the SLS reporting unit was $2.4 million reflecting an impairment charge in fiscal 2003.

Schedule of components of amortizable intangible assets

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

	Fiscal year-end 2016							Fiscal year-end 2015
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Existing technology	$	70,664	$	(61,133	)	$	9,531	$	71,365	$	(55,452	)	$	15,913
Customer lists	15,968		(11,658		)	4,310		16,099		(9,661		)	6,438
Trade name	384		(351		)	33		399		(349		)	50
In-process research and development	—		—			—		375		—			375
Total	$	87,016	$	(73,142	)	$	13,874	$	88,238	$	(65,462	)	$	22,776

Schedule of estimated amortization expense

Estimated amortization expense for the next five fiscal years and all years thereafter are as follows (in thousands):

	Estimated Amortization Expense
2017	$	6,932
2018	4,197
2019	2,107
2020	634
2021	2
Thereafter	2
Total	$	13,874