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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Oct. 01, 2016
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Short term investments, available-for-sale(1) | [1] | $ 139,000 | $ 124,000
Inventories, net: |  |  |
Raw materials and supplies (2) | [2] | 32,261 | 26,876
Work in process (2) | [2] | 36,788 | 24,333
Finished goods (2) | [2] | 50,164 | 57,166
Inventory, gross |  | 119,213 | 108,375
Inventory reserves |  | (20,528) | (21,080)
Inventories, net |  | 98,685 | 87,295
Property, plant and equipment, net: |  |  |
Land |  | 2,182 | 0
Buildings and building improvements |  | 50,107 | 34,472
Leasehold improvements |  | 9,685 | 19,963
Data processing equipment and software (2) | [2] | 34,323 | 32,975
Machinery, equipment, furniture and fixtures |  | 63,124 | 54,730
Property, plant and equipment, gross |  | 159,421 | 142,140
Accumulated depreciation (2) | [2] | (93,696) | (91,798)
Property, plant and equipment, net |  | 65,725 | 50,342
Accrued expenses and other current liabilities: |  |  |
Wages and benefits |  | 26,427 | 24,248
Accrued customer obligations (3) | [3] | 16,930 | 13,077
Commissions and professional fees |  | 8,064 | 10,908
Deferred rent |  | 1,940 | 2,920
Severance (4) | [4] | 878 | 1,296
Other |  | 12,611 | 11,505
Accrued expenses and other current liabilities |  | $ 66,850 | $ 63,954
[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. As of April 1, 2017, fair value approximated the cost basis for short-term investments. The Company did not recognize any realized gains or losses on the sale of investments during the three and six months ended April 1, 2017 and April 2, 2016.
[2] | Certain balances as at October 1, 2016 relating to Inventories and Property, plant and equipment have been reclassified for comparative purposes. These reclassifications have no impact to the Consolidated Condensed Balance Sheet as at October 1, 2016.
[3] | Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.
[4] | Includes the restructuring plan discussed in Note 2, severance payable in connection with the October 2015 retirement of the Company's CEO of $0.5 million (as of October 1, 2016: $0.8 million), and other severance payments.

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