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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Jan. 01, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Amount of Goodwill by Segment
The changes in the carrying amount of goodwill, all of which is in the OEM Laser Sources ("OLS") segment, for the period from October 2, 2021 to January 1, 2022 are as follows (in thousands):
 OEM Laser Sources
Balance as of October 2, 2021$105,261 
Translation adjustments(1,476)
Balance as of January 1, 2022$103,785 
Schedule of Components of Amortizable Intangible Assets
Components of our amortizable intangible assets are as follows (in thousands):
 January 1, 2022October 2, 2021
 Gross
Carrying
Amount		Accumulated
Amortization		NetGross
Carrying
Amount		Accumulated
Amortization		Net
Existing technology$5,846 $(2,677)$3,169 $39,524 $(35,522)$4,002 
Customer relationships21,666 (12,797)8,869 22,101 (12,586)9,515 
Production know-how2,300 (1,492)808 2,300 (1,377)923 
In-process research & development300 — 300 300 — 300 
Total$30,112 $(16,966)$13,146 $64,225 $(49,485)$14,740 
Schedule of Estimated Amortization Expense
At January 1, 2022, estimated amortization expense for the remainder of fiscal 2022, the next five succeeding fiscal years and all fiscal years thereafter are as follows (in thousands):
 Estimated Amortization
Expense
2022 (remainder)$2,532 
20233,373 
20242,589 
20252,272 
20261,925 
2027155 
Total(1)
$12,846 
(1) Excluding in-process research & development