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STOCKHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION - Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Non-Employees (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 29, 2024 | Mar. 31, 2023 | Mar. 29, 2024 | Mar. 31, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | $ 12,090 | $ 9,460 | $ 20,747 | $ 20,507
Cost of Revenue |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 1,600 | 1,011 | 2,870 | 2,161
Research and Development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 4,962 | 3,742 | 7,727 | 7,974
Selling, General and Administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | $ 5,528 | $ 4,707 | $ 10,150 | $ 10,372

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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