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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Mar. 28, 2015 | Mar. 29, 2014
Statement of Cash Flows [Abstract] |  |
Net income | $ 15,773 us-gaap_NetIncomeLoss | $ 7,113 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 8,563 us-gaap_DepreciationDepletionAndAmortization | 6,486 us-gaap_DepreciationDepletionAndAmortization
Equity-based compensation and employee benefits | 6,016 us-gaap_EmployeeBenefitsAndShareBasedCompensation | 6,082 us-gaap_EmployeeBenefitsAndShareBasedCompensation
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) | 292 us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (185)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Adjustment for inventory valuation | 581 us-gaap_InventoryWriteDown | 1,894 us-gaap_InventoryWriteDown
Deferred taxes | 1,766 us-gaap_DeferredIncomeTaxExpenseBenefit | 143 us-gaap_DeferredIncomeTaxExpenseBenefit
Gain (Loss) on Disposition of Property Plant Equipment | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 30 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Foreign Currency Transaction Gain (Loss), Unrealized | (1,973)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (159)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Changes in operating assets and liabilities, net of assets and liabilities assumed in business combinations: |  |
Accounts and notes receivable | 31,467 us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable | 65,502 us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable
Inventory | (8,161)us-gaap_IncreaseDecreaseInInventories | (7,374)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets | 2,408 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 5,551 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable, accrued expenses and other current liabilities | (7,787)klic_IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities | (7,450)klic_IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities
Income taxes payable | (2,458)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 263 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other, net | 2,073 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 374 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by operating activities | 48,560 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 78,270 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Acquisition of business, net of cash acquired | (93,153)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchases of property, plant and equipment | (4,903)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (7,417)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of short-term investments | (1,630)us-gaap_PaymentsToAcquireInvestments | (9,173)us-gaap_PaymentsToAcquireInvestments
Maturity of short-term investments | 9,129 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments | 3,261 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Net cash used in investing activities | (90,557)us-gaap_NetCashProvidedByUsedInInvestingActivities | (13,329)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Payment on debts | (9,732)us-gaap_RepaymentsOfUnsecuredDebt | (109)us-gaap_RepaymentsOfUnsecuredDebt
Proceeds from exercise of common stock options | 528 us-gaap_ProceedsFromStockOptionsExercised | 588 us-gaap_ProceedsFromStockOptionsExercised
Proceeds from short term loans | 837 us-gaap_ProceedsFromShortTermDebt | 0 us-gaap_ProceedsFromShortTermDebt
Repurchase of common stock | (10,225)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in)/provided by financing activities | (18,592)us-gaap_NetCashProvidedByUsedInFinancingActivities | 479 us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (246)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (98)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Changes in cash and cash equivalents | (60,835)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 65,322 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 587,981 us-gaap_CashAndCashEquivalentsAtCarryingValue | 521,788 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 527,146 us-gaap_CashAndCashEquivalentsAtCarryingValue |
CASH PAID FOR: |  |
Interest | 591 us-gaap_InterestPaid | 416 us-gaap_InterestPaid
Income taxes | $ 2,409 us-gaap_IncomeTaxesPaid | $ 1,710 us-gaap_IncomeTaxesPaid

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