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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Oct. 03, 2015
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 2015 and 2014 are as follows (in thousands):
 
Commercial
Lasers and
Components (1)
 
Specialty
Laser
Systems (2)
 
Total
Balance as of September 28, 2013
$
6,363

 
$
107,045

 
$
113,408

Translation adjustments and other
—

 
(3,895
)
 
(3,895
)
Balance as of September 27, 2014
6,363

 
103,150

 
109,513

Additions (see Note 3)
—

1,119

1,119

 
1,119

Translation adjustments and other
—

 
(8,815
)
 
(8,815
)
Balance as of October 3, 2015
$
6,363

 
$
95,454

 
$
101,817

(1) Gross amount of goodwill for our CLC segment was $25.7 million at both October 3, 2015 and September 27, 2014. At both October 3, 2015 and September 27, 2014, 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 $97.8 million and $105.5 million at October 3, 2015 and September 27, 2014. At both October 3, 2015 and September 27, 2014, 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 2015 Year-ended October 3, 2015
 
Fiscal 2014 Year-ended September 27, 2014
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Existing technology
$
71,365

 
$
(55,452
)
 
$
15,913

 
$
81,551

 
$
(57,827
)
 
$
23,724

Customer lists
16,099

 
(9,661
)
 
6,438

 
16,632

 
(9,199
)
 
7,433

Trade name
399

 
(349
)
 
50

 
431

 
(346
)
 
85

In-process research and development
375

 
—

 
375

 
424

 
—

 
424

Total
$
88,238

 
$
(65,462
)
 
$
22,776

 
$
99,038

 
$
(67,372
)
 
$
31,666


For accounting purposes, when an intangible asset is fully amortized, it is removed from the disclosure schedule.
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
2016
$
8,157

2017
7,034

2018
4,291

2019
2,273

2020
628

Thereafter
393

Total
$
22,776