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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.

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- Definition This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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- Definition Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Postemployment Benefits -URI http://asc.fasb.org/extlink&oid=6519534 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 112 -Paragraph 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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