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INTANGIBLE ASSETS (Tables)
 6 Months Ended
Mar. 29, 2024
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 EndedSix Months Ended
 March 29,
2024		March 31,
2023		March 29,
2024		March 31,
2023
Cost of revenue$4,200 $988 $6,142 $1,898 
Research and development1,043 — 2,087 — 
Selling, general and administrative4,121 5,764 8,919 11,667 
Total$9,364 $6,752 $17,148 $13,565 
Summary of Activity in Intangible Assets and Goodwill
A summary of the activity in gross intangible assets as of March 29, 2024 and September 29, 2023 is as follows (in thousands):

March 29,
2024
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Acquired technology$213,012 $(182,670)$30,342 
Customer relationships274,652 (234,626)40,026 
Favorable contract14,500 (3,026)11,474 
Internal-use software8,350 (2,087)6,263 
Trade name (1)
5,200 (292)4,908 
Balance as of March 29, 2024 (2)
$515,714 $(422,701)$93,013 
September 29,
2023
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Acquired technology$191,369 $(179,558)$11,811 
Customer relationships267,621 (225,827)41,794 
Internal-use software8,350 — 8,350 
Trade name (1)
5,200 (161)5,039 
Balance as of September 29, 2023 (2)
$472,540 $(405,546)$66,994 
(1) Includes an indefinite-lived trade name of $3.4 million that is not amortized.
(2) Foreign intangible asset carrying amounts were affected by foreign currency translation.
Summary of Estimated Amortization of Intangible Assets in Future Fiscal Years
As of March 29, 2024, our estimated amortization of our intangible assets in future fiscal years was as follows (in thousands):
2024 Remaining2025202620272028ThereafterTotal
Amortization expense$19,419 24,716 13,530 11,045 8,172 12,731 $89,613 
Schedule of Goodwill
A summary of the changes in goodwill as of March 29, 2024 is as follows (in thousands):
March 29,
2024
Balance as of September 29, 2023$323,398 
Acquired (1)
7,089 
Foreign currency translation adjustment(114)
Balance as of March 29, 2024$330,373 
(1)     The balance consists of an increase of $8.6 million to goodwill related to measurement period adjustments for the RF Business Acquisition and a reduction of $1.5 million to goodwill related to measurement period adjustments for the Linearizer Acquisition. For additional information refer to Note 3 - Acquisitions.