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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($) $ in Thousands | Jun. 27, 2020 | Sep. 28, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Short-term investments | [1] | $ 194,000 | $ 229,000
Inventories, net: |  |  |
Raw materials and supplies |  | 63,878 | 52,853
Work in process |  | 41,757 | 32,026
Finished goods |  | 39,663 | 33,742
Inventory, gross |  | 145,298 | 118,621
Inventory reserves |  | (31,104) | (29,313)
Inventories, net |  | 114,194 | 89,308
Property, plant and equipment, net: |  |  |
Land |  | 2,182 | 2,182
Buildings and building improvements |  | 22,542 | 41,961
Leasehold improvements |  | 22,812 | 24,441
Data processing equipment and software |  | 37,760 | 36,302
Machinery, equipment, furniture and fixtures |  | 76,589 | 71,465
Construction in progress |  | 6,578 | 6,512
Property, plant and equipment, gross |  | 168,463 | 182,863
Accumulated depreciation |  | (112,637) | (110,493)
Property, plant and equipment, net |  | 55,826 | 72,370
Accrued expenses and other current liabilities: |  |  |
Accrued customer obligations (2) | [2] | 25,322 | 26,292
Wages and benefits |  | 31,074 | 18,188
Dividend payable |  | 7,431 | 7,582
Commissions and professional fees |  | 2,486 | 2,024
Deferred rent |  | 0 | 1,721
Severance |  | 494 | 1,500
Other |  | 7,817 | 7,226
Accrued expenses and other current liabilities |  | $ 74,624 | $ 64,533
[1] | All short-term investments were classified as available-for-sale and were measured at fair value based on level one measurement, or quoted market prices, as defined by ASC 820. The Company did not recognize any realized gains or losses on the sale of investments during the three and nine months ended June 27, 2020 and June 29, 2019.
[2] | Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.

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