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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($) $ in Thousands | Apr. 03, 2021 | Oct. 03, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Short-term investments | [1] | $ 307,000 | $ 342,000
Inventories, net: |  |  |
Raw materials and supplies |  | 67,746 | 60,205
Work in process |  | 57,176 | 39,753
Finished goods |  | 44,689 | 43,015
Inventory, gross |  | 169,611 | 142,973
Inventory reserves |  | (29,612) | (31,164)
Inventories, net |  | 139,999 | 111,809
Property, plant and equipment, net: |  |  |
Land |  | 2,182 | 2,182
Buildings and building improvements |  | 23,171 | 22,830
Leasehold improvements |  | 23,678 | 23,111
Data processing equipment and software |  | 39,434 | 38,524
Machinery, equipment, furniture and fixtures |  | 85,948 | 80,953
Construction in progress |  | 8,559 | 7,111
Property, plant and equipment, gross |  | 182,972 | 174,711
Accumulated depreciation |  | (121,007) | (115,564)
Property, plant and equipment, net |  | 61,965 | 59,147
Accrued expenses and other current liabilities: |  |  |
Accrued customer obligations (2) | [2] | 47,265 | 22,759
Wages and benefits |  | 36,879 | 37,237
Dividend payable |  | 8,688 | 7,397
Commissions and professional fees |  | 4,075 | 2,716
Severance |  | 3 | 449
Other |  | 7,476 | 6,204
Accrued expenses and other current liabilities |  | $ 104,386 | $ 76,762
[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 six months ended April 3, 2021 and March 28, 2020.
[2] | Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.

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