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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($) $ in Thousands | Jun. 29, 2024 | Sep. 30, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Short-term investments | $ 235,000 | $ 230,000
Inventories, net: |  |
Raw materials and supplies | 126,755 | 114,827
Work in process | 47,917 | 74,555
Finished goods | 58,339 | 49,207
Inventory, gross | 233,011 | 238,589
Inventory reserves | (57,460) | (21,285)
Inventories, net | 175,551 | 217,304
Property, plant and equipment, net: |  |
Land | 2,182 | 2,182
Buildings and building improvements | 23,811 | 23,105
Leasehold improvements | 85,239 | 82,927
Data processing equipment and software | 39,691 | 37,483
Machinery, equipment, furniture and fixtures | 101,562 | 95,692
Construction in progress | 10,879 | 11,099
Property, plant and equipment, gross | 263,364 | 252,488
Accumulated depreciation | (157,253) | (142,437)
Accumulated impairment | (41,575) | 0
Property, plant and equipment, net | 64,536 | 110,051
Accrued expenses and other current liabilities: |  |
Accrued customer obligations | 33,363 | 35,701
Wages and benefits | 24,831 | 33,096
Dividends payable | 10,985 | 10,710
Commissions and professional fees | 4,902 | 4,091
Accrued leasehold renovations | 7,414 | 11,005
Other | 8,484 | 8,402
Accrued expenses and other current liabilities | $ 89,979 | $ 103,005

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