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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2013
Sep. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Short-term Investments $ 6,552 $ 3,252
Inventories, net:    
Raw materials and supplies 21,545 19,703
Work in process 13,143 12,219
Finished goods 15,899 20,333
Inventory, gross 50,587 52,255
Inventory reserves (14,325) (14,120)
Inventories, net 36,262 38,135
Property, plant and equipment, net:    
Buildings and building improvements (2) 23,079 3,060
Leasehold improvements 12,470 15,763
Data processing equipment and software 24,670 24,549
Machinery, equipment, furniture and fixtures 54,176 48,998
Construction in progress (2) 0 [1] 19,396 [1]
Property, plant and equipment, gross 114,395 111,766
Accumulated depreciation (61,864) (64,225)
Property, plant and equipment, net 52,531 47,541
Accrued expenses and other current liabilities:    
Wages and benefits 10,222 19,779
Accrued customer obligations (3) 8,597 [2] 8,270 [2]
Commissions and professional fees 1,718 [3] 2,640 [3]
Severance 973 1,468
Other 6,842 6,711
Accrued expenses and other current liabilities $ 28,352 $ 38,868
[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 December 28, 2013 and September 28, 2013, 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 months ended December 28, 2013 and December 29, 2012.
[2] Pursuant to ASC No. 840, Leases, the Company was considered to be the owner of the building during the construction phase for the Agreement to Develop and Lease (the “ADL”) facility being developed by Mapletree Industrial Trust (the “Landlord”) in Singapore—see Notes 6 and 11 below. The construction costs incurred to date in relation to the relevant proportion of the Company's lease are recognized on the Consolidated Balance Sheet as of December 28, 2013.
[3] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit costs.