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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Oct. 01, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Depreciation $ 9,311 $ 8,087 $ 8,212
Short-term Investments 3,252 [1] 0 [1]  
Inventories, net:      
Raw materials and supplies 19,703 26,660  
Work in process 12,219 23,352  
Finished goods 20,333 27,599  
Inventory, gross 52,255 77,611  
Inventory reserves (14,120) (18,617)  
Inventories, net 38,135 58,994  
Property, plant and equipment, net:      
Land 0 2,086  
Buildings and building improvements 3,060 4,830  
Leasehold improvements 15,763 16,005  
Data processing equipment and software 24,549 23,819  
Machinery, equipment, furniture and fixtures 48,998 40,580  
Construction in progress (2) 19,396 [2] 3,219 [2]  
Property, plant and equipment, gross 111,766 90,539  
Accumulated depreciation (3) (64,225) [3] (62,098) [3]  
Property, plant and equipment, net 47,541 28,441  
Accrued expenses and other current liabilities:      
Wages and benefits 19,779 18,734  
Accrued customer obligations (4) 8,270 [4] 22,984 [4]  
Commissions and professional fees 2,640 2,776  
Severance 1,468 2,840  
Other 6,711 10,612  
Accrued expenses and other current liabilities $ 38,868 $ 57,946  
[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 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 fiscal 2013.
[2] Pursuant to ASC No. 840, Leases, the Company is considered 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 Note 12 below. The estimated construction costs incurred to date in relation to the relevant proportion of the Company's lease is recognized on the Consolidated Balance Sheet as at September 28, 2013 and September 29, 2012. Applicable ground lease expense of $0.5 million was accrued as of September 28, 2013.
[3] The depreciation expense for the years ended September 28, 2013 and September 29, 2012 are $9.3 million and $8.1 million respectively.
[4] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit costs.