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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($) $ in Thousands | Dec. 30, 2023 | Sep. 30, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Short-term investments | $ 285,000 | $ 230,000
Inventories, net: |  |
Raw materials and supplies | 119,077 | 114,827
Work in process | 85,499 | 74,555
Finished goods | 55,463 | 49,207
Inventory, gross | 260,039 | 238,589
Inventory reserves | (23,481) | (21,285)
Inventories, net | 236,558 | 217,304
Property, plant and equipment, net: |  |
Land | 2,182 | 2,182
Buildings and building improvements | 23,213 | 23,105
Leasehold improvements | 83,586 | 82,927
Data processing equipment and software | 38,267 | 37,483
Machinery, equipment, furniture and fixtures | 98,773 | 95,692
Construction in progress | 11,345 | 11,099
Property, plant and equipment, gross | 257,366 | 252,488
Accumulated depreciation | (150,093) | (142,437)
Property, plant and equipment, net | 107,273 | 110,051
Accrued expenses and other current liabilities: |  |
Accrued customer obligations | 36,287 | 35,701
Wages and benefits | 23,060 | 33,096
Dividends payable | 11,303 | 10,710
Commissions and professional fees | 4,270 | 4,091
Accrued leasehold renovations | 10,013 | 11,005
Other | 6,260 | 8,402
Accrued expenses and other current liabilities | $ 91,193 | $ 103,005

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