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Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Amortization Expense of Intangible Assets
Amortization expense related to intangible assets is as follows (in thousands):
 Three Months Ended
 December 31,
2021		January 1,
2021
Cost of revenue$2,505 $3,877 
Selling, general and administrative6,782 8,116 
Total$9,287 $11,993 
Summary of Intangible Assets
Intangible assets consist of the following (in thousands):
December 31,
2021		October 1,
2021
Acquired technology$179,434 $179,434 
Customer relationships245,870 245,870 
Trade name (indefinite-lived)3,400 3,400 
Total 428,704 428,704 
Less accumulated amortization(353,306)(344,019)
Intangible assets — net$75,398 $84,685 
Summary of Activity in Intangible Assets and Goodwill
A summary of the activity in gross intangible assets and goodwill is as follows (in thousands):
Intangible Assets
Total Intangible AssetsAcquired
Technology		Customer
Relationships		Trade NameGoodwill
Balance as of October 1, 2021$428,704 $179,434 $245,870 $3,400 $314,240 
Currency translation adjustment— — — — (342)
Balance as of December 31, 2021$428,704 $179,434 $245,870 $3,400 $313,898 
Summary of Estimated Amortization of Intangible Assets in Future Fiscal Years
As of December 31, 2021, our estimated amortization of our intangible assets in future fiscal years was as follows (in thousands):
2022 Remaining2023202420252026ThereafterTotal
Amortization expense$24,146 26,048 15,410 3,490 1,644 1,260 $71,998