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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Short term investments, available-for-sale(1) | [1] | $ 288,000 | $ 216,000
Inventories, net: |  |  |
Raw materials and supplies |  | 55,993 | 44,239
Work in process |  | 47,460 | 40,827
Finished goods |  | 40,646 | 61,596
Inventory, gross |  | 144,099 | 146,662
Inventory reserves |  | (25,268) | (24,639)
Inventories, net |  | 118,831 | 122,023
Property, plant and equipment, net: |  |  |
Land |  | 2,182 | 2,182
Buildings and building improvements |  | 51,160 | 50,910
Leasehold improvements |  | 9,288 | 9,882
Data processing equipment and software |  | 34,952 | 34,700
Machinery, equipment, furniture and fixtures |  | 78,114 | 68,143
Property, plant and equipment, gross |  | 175,696 | 165,817
Accumulated depreciation |  | (100,077) | (98,055)
Property, plant and equipment, net |  | 75,619 | 67,762
Accrued expenses and other current liabilities: |  |  |
Wages and benefits |  | 31,168 | 47,411
Accrued customer obligations (2) | [2] | 30,968 | 52,460
Commissions and professional fees |  | 7,536 | 8,555
Deferred rent |  | 1,908 | 1,930
Severance (3) | [3] | 1,217 | 3,828
Other |  | 12,336 | 10,663
Accrued expenses and other current liabilities |  | $ 85,133 | $ 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 six months ended March 31, 2018 and April 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 CFO of $0.7 million, and other severance payments.

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