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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 27, 2014 | Dec. 28, 2013
Statement of Cash Flows [Abstract] |  |
Net income / (loss) | $ 7,842us-gaap_NetIncomeLoss | $ (1,957)us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 3,556us-gaap_DepreciationDepletionAndAmortization | 2,992us-gaap_DepreciationDepletionAndAmortization
Equity-based compensation and employee benefits | 3,435us-gaap_EmployeeBenefitsAndShareBasedCompensation | 3,396us-gaap_EmployeeBenefitsAndShareBasedCompensation
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) | 143us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | 229us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Adjustment for inventory valuation | 169us-gaap_InventoryWriteDown | 905us-gaap_InventoryWriteDown
Deferred taxes | 351us-gaap_DeferredIncomeTaxExpenseBenefit | (116)us-gaap_DeferredIncomeTaxExpenseBenefit
Foreign Currency Transaction Gain (Loss), Unrealized | (1,569)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (195)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Changes in operating assets and liabilities: |  |
Accounts and notes receivable | 49,302us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable | 49,245us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable
Inventory | (2,903)us-gaap_IncreaseDecreaseInInventories | 972us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets | 4,009us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 7,197us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable, accrued expenses and other current liabilities | (18,172)klic_IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities | (26,019)klic_IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities
Income taxes payable | 169us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 505us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other, net | 110us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 95us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by operating activities | 46,442us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 37,249us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property, plant and equipment | (2,546)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (5,429)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of short-term investments | (1,630)us-gaap_PaymentsToAcquireInvestments | (3,300)us-gaap_PaymentsToAcquireInvestments
Repayments of Unsecured Debt | (81)us-gaap_RepaymentsOfUnsecuredDebt | (209)us-gaap_RepaymentsOfUnsecuredDebt
Net cash used in investing activities | (4,176)us-gaap_NetCashProvidedByUsedInInvestingActivities | (8,729)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Payment on debts | 98us-gaap_ProceedsFromStockOptionsExercised | 467us-gaap_ProceedsFromStockOptionsExercised
Payments for Repurchase of Common Stock | (7,638)us-gaap_PaymentsForRepurchaseOfCommonStock | 0us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) / provided by financing activities | (7,621)us-gaap_NetCashProvidedByUsedInFinancingActivities | 258us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (36)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 32us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Changes in cash and cash equivalents | 34,609us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 28,810us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 587,981us-gaap_CashAndCashEquivalentsAtCarryingValue | 521,788us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 622,590us-gaap_CashAndCashEquivalentsAtCarryingValue | 550,598us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH PAID FOR: |  |
Interest | 303us-gaap_InterestPaid | 119us-gaap_InterestPaid
Income taxes | $ 956us-gaap_IncomeTaxesPaid | $ 890us-gaap_IncomeTaxesPaid

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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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