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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Sep. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Short-term Investments [1] $ 355,000 $ 293,000
Inventories, net:    
Raw materials and supplies 63,633 63,894
Work in process 36,204 37,829
Finished goods 36,711 40,357
Inventory, gross 136,548 142,080
Inventory reserves (26,817) (26,889)
Inventories, net 109,731 115,191
Property, plant and equipment, net:    
Land 2,182 2,182
Buildings and building improvements 52,323 52,449
Leasehold improvements 12,868 12,728
Data processing equipment and software 36,105 35,469
Machinery, equipment, furniture and fixtures 70,066 68,666
Construction in progress 8,492 6,940
Property, plant and equipment, gross 182,036 178,434
Accumulated depreciation (104,716) (102,367)
Property, plant and equipment, net 77,320 76,067
Accrued expenses and other current liabilities:    
Wages and benefits 19,391 44,505
Accrued customer obligations (2) [2] 33,491 34,918
Dividend payable 8,055 8,057
Commissions and professional fees 3,981 5,549
Deferred rent 1,820 1,847
Severance 717 1,415
Other 8,450 9,687
Accrued expenses and other current liabilities $ 75,905 $ 105,978
[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 months ended December 29, 2018 and December 30, 2017.
[2] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.