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Revenue Recognition (Tables)
 6 Months Ended
Apr. 03, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Revenue from Contracts with Customers
The following tables summarize revenue from contracts with customers (in thousands):

Sales by revenue type and segment
Three Months Ended
April 3, 2021April 4, 2020
OEM Laser SourcesIndustrial Lasers & SystemsOEM Laser SourcesIndustrial Lasers & Systems
Net sales:
Products(1)
$130,458 $121,610 $101,860 $92,693 
Other product and service revenues(2)
92,790 29,124 71,862 26,732 
Total net sales$223,248 $150,734 $173,722 $119,425 
(1) Net sales primarily recognized at a point in time.
(2) Includes sales of spare parts, related accessories and other consumable parts as well as revenues from service agreements, of which $16.5 million and $15.3 million for the three months ended April 3, 2021 and April 4, 2020, respectively, were recognized over time.
Six Months Ended
April 3, 2021April 4, 2020
OEM Laser SourcesIndustrial Lasers & SystemsOEM Laser SourcesIndustrial Lasers & Systems
Net sales:
Products(1)
$256,035 $210,922 $211,696 $186,596 
Other product and service revenues(2)
178,375 54,703 162,974 52,652 
Total net sales$434,410 $265,625 $374,670 $239,248 

(1) Net sales primarily recognized at a point in time.
(2) Includes sales of spare parts, related accessories and other consumable parts as well as revenues from service agreements, of which $32.5 million and $30.9 million for the six months ended April 3, 2021 and April 4, 2020, respectively, were recognized over time.
Sales by market application and segment
Three Months Ended
April 3, 2021April 4, 2020
OEM Laser SourcesIndustrial Lasers & SystemsOEM Laser SourcesIndustrial Lasers & Systems
Net sales:
Microelectronics$138,181 $30,096 $104,901 $16,866 
Precision manufacturing15,771 91,627 8,397 77,910 
Instrumentation67,078 21,255 56,838 16,570 
Aerospace and defense2,218 7,756 3,586 8,079 
Total net sales$223,248 $150,734 $173,722 $119,425 

Six Months Ended
April 3, 2021April 4, 2020
OEM Laser SourcesIndustrial Lasers & SystemsOEM Laser SourcesIndustrial Lasers & Systems
Net sales:
Microelectronics$266,354 $50,771 $219,794 $32,519 
Precision manufacturing27,630 161,218 18,792 155,887 
Instrumentation134,354 39,206 125,024 35,564 
Aerospace and defense6,072 14,430 11,060 15,278 
Total net sales$434,410 $265,625 $374,670 $239,248 
Summary of Customer Deposits and Deferred Revenue
A rollforward of our customer deposits and deferred revenue is as follows (in thousands):
Six Months Ended
April 3, 2021April 4, 2020
Beginning balance (1)
$56,339 $42,550 
Additions to customer deposits and deferred revenue105,775 89,885 
Amount of customer deposits and deferred revenue recognized in income (2)
(91,248)(77,827)
Translation adjustments(164)(301)
Ending balance (3)
$70,702 $54,307 

(1) Beginning customer deposits and deferred revenue as of October 3, 2020 include $42,715 of current portion and $13,624 of long-term portion. Beginning customer deposits and deferred revenue as of September 28, 2019 include $34,538 of current portion and $8,012 of long-term portion.

(2) Amount of customer deposits and deferred revenue recognized in the three months ended April 3, 2021 and April 4, 2020 was $49,167 and $37,467, respectively.
    
(3) Ending customer deposits and deferred revenue as of April 3, 2021 include $57,116 of current portion and $13,586 of long-term portion. Ending customer deposits and deferred revenue as of April 4, 2020 include $42,939 of current portion and $11,368 of long-term portion.
Summary of Estimated Revenue Expected to be Recognized in the Future The following table includes estimated revenue expected to be recognized in the future related to performance obligations for sales of maintenance agreements, extended warranties, installation, and contracts with customer acceptance provisions included in customer deposits and deferred revenue as of April 3, 2021 (in thousands):
Remainder of fiscal 2021ThereafterTotal
Performance obligations as of April 3, 2021$48,669 $22,033 $70,702