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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Short term investments, available-for-sale(1) [1] $ 258,000 $ 216,000
Inventories, net:    
Raw materials and supplies 59,817 44,239
Work in process 50,561 40,827
Finished goods 38,914 61,596
Inventory, gross 149,292 146,662
Inventory reserves (25,999) (24,639)
Inventories, net 123,293 122,023
Property, plant and equipment, net:    
Land 2,182 2,182
Buildings and building improvements 52,615 50,910
Leasehold improvements 12,898 9,882
Data processing equipment and software 35,391 34,700
Machinery, equipment, furniture and fixtures 67,087 60,143
Construction in progress 6,893 8,000
Property, plant and equipment, gross 177,066 165,817
Accumulated depreciation (101,002) (98,055)
Property, plant and equipment, net 76,064 67,762
Accrued expenses and other current liabilities:    
Wages and benefits 40,215 47,411
Accrued customer obligations (2) [2] 35,108 52,460
Commissions and professional fees 5,938 8,555
Dividends payable 8,176 0
Deferred rent 1,873 1,930
Severance (3) [3] 976 3,828
Other 13,907 10,663
Accrued expenses and other current liabilities $ 106,193 $ 124,847
[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 30, 2018 and July 1, 2017.
[2] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.
[3] Includes the restructuring plan discussed in Note 3, severance payable in connection with the November 2017 departure of the Company's Chief Financial Officer of $0.6 million, and other severance payments.