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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($)
$ in Thousands
Jan. 02, 2021
Oct. 03, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Short-term investments [1] $ 337,000 $ 342,000
Inventories, net:    
Raw materials and supplies 66,503 60,205
Work in process 44,818 39,753
Finished goods 42,774 43,015
Inventory, gross 154,095 142,973
Inventory reserves (29,013) (31,164)
Inventories, net 125,082 111,809
Property, plant and equipment, net:    
Land 2,182 2,182
Buildings and building improvements 23,194 22,830
Leasehold improvements 24,199 23,111
Data processing equipment and software 39,081 38,524
Machinery, equipment, furniture and fixtures 83,942 80,953
Construction in progress 8,407 7,111
Property, plant and equipment, gross 181,005 174,711
Accumulated depreciation (120,070) (115,564)
Property, plant and equipment, net 60,935 59,147
Accrued expenses and other current liabilities:    
Accrued customer obligations (2) [2] 34,019 22,759
Wages and benefits 29,795 37,237
Dividend payable 8,687 7,397
Commissions and professional fees 3,769 2,716
Severance 66 449
Other 7,141 6,204
Accrued expenses and other current liabilities $ 83,477 $ 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 months ended January 2, 2021 and December 28, 2019.
[2] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.