EMPLOYEE STOCK PLANS - Share-based Compensation Expense (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Dec. 30, 2022 |
Dec. 31, 2021 |
|
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total share-based compensation expense | $ 3.3 | $ 3.4 |
| Cost of revenues | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total share-based compensation expense | 0.4 | 0.4 |
| Research and development | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total share-based compensation expense | 0.8 | 0.8 |
| Selling, general and administrative | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total share-based compensation expense | $ 2.1 | $ 2.2 |