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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Sep. 27, 2014
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Deposits maturing within one year (1) | $ 10,787us-gaap_ShortTermInvestments | [1] | $ 9,105us-gaap_ShortTermInvestments | [1]
Inventories, net: |  |  |  |
Raw materials and supplies | 22,712us-gaap_InventoryRawMaterialsAndSupplies |  | 22,184us-gaap_InventoryRawMaterialsAndSupplies |
Work in process | 24,545us-gaap_InventoryWorkInProcess |  | 18,783us-gaap_InventoryWorkInProcess |
Finished goods | 18,203us-gaap_InventoryFinishedGoods |  | 22,590us-gaap_InventoryFinishedGoods |
Inventory, gross | 65,460us-gaap_InventoryGross |  | 63,557us-gaap_InventoryGross |
Inventory reserves | (13,530)us-gaap_InventoryValuationReserves |  | (13,863)us-gaap_InventoryValuationReserves |
Inventories, net | 51,930us-gaap_InventoryNet |  | 49,694us-gaap_InventoryNet |
Property, plant and equipment, net: |  |  |  |
Buildings and building improvements | 31,178us-gaap_BuildingsAndImprovementsGross |  | 31,159us-gaap_BuildingsAndImprovementsGross |
Leasehold improvements | 13,873us-gaap_LeaseholdImprovementsGross |  | 13,962us-gaap_LeaseholdImprovementsGross |
Data processing equipment and software | 27,612klic_EquipmentAndSoftwareGross |  | 27,538klic_EquipmentAndSoftwareGross |
Machinery, equipment, furniture and fixtures | 47,593us-gaap_PropertyPlantAndEquipmentOther |  | 45,442us-gaap_PropertyPlantAndEquipmentOther |
Property, plant and equipment, gross | 120,256us-gaap_PropertyPlantAndEquipmentGross |  | 118,101us-gaap_PropertyPlantAndEquipmentGross |
Accumulated depreciation | (67,463)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | (65,346)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Property, plant and equipment, net | 52,793us-gaap_PropertyPlantAndEquipmentNet |  | 52,755us-gaap_PropertyPlantAndEquipmentNet |
Accrued expenses and other current liabilities: |  |  |  |
Wages and benefits | 13,355us-gaap_EmployeeRelatedLiabilitiesCurrent |  | 21,498us-gaap_EmployeeRelatedLiabilitiesCurrent |
Accrued customer obligations (2) | 6,347us-gaap_PayablesToCustomers | [2] | 8,999us-gaap_PayablesToCustomers | [2]
Commissions and professional fees | 2,314klic_AccruedLiabilitiesForCommissionAndProfessionalFeesCurrent |  | 1,961klic_AccruedLiabilitiesForCommissionAndProfessionalFeesCurrent |
Deferred rent | 2,422us-gaap_DeferredRentCreditCurrent |  | 2,161us-gaap_DeferredRentCreditCurrent |
Severance | 617us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits |  | 1,067us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits |
Other | 7,489us-gaap_OtherLiabilitiesCurrent |  | 8,045us-gaap_OtherLiabilitiesCurrent |
Accrued expenses and other current liabilities | $ 32,544klic_AccruedExpensesAndOtherCurrentLiabilities |  | $ 43,731klic_AccruedExpensesAndOtherCurrentLiabilities |
[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 27, 2014 and September 27, 2014, 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 27, 2014 and December 28, 2013.
[2] | Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.

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- Definition Amounts payable to customers at the balance sheet date. The term customers generally excludes other broker-dealers; persons who are principal officers, directors, and stockholders; and persons whose securities or funds are part of the regulatory net capital of the broker-dealer. Another broker-dealer's account can be classified as a customer if the account is carried as an omnibus account in compliance with certain regulations. The accounts of principal officers, directors and stockholders may be combined in the customer captions if they are not material and the combination is disclosed in the oath that is required to accompany the annual audited FOCUS Report. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Article 15c3 -Subsection c + Details
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