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EARNINGS PER SHARE (Reconciliation of the shares used in the basic and diluted net income per share computation) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
NUMERATOR:
Net income	$ 7,931us-gaap_NetIncomeLoss	$ 9,070us-gaap_NetIncomeLoss	$ 15,773us-gaap_NetIncomeLoss	$ 7,113us-gaap_NetIncomeLoss
Less: income applicable to participating securities	0us-gaap_PreferredStockDividendsAndOtherAdjustments	0us-gaap_PreferredStockDividendsAndOtherAdjustments	0us-gaap_PreferredStockDividendsAndOtherAdjustments	0us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income applicable to common shareholders	$ 7,931us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 9,070us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 15,773us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 7,113us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
DENOMINATOR:
Weighted average shares outstanding - Basic (in shares)	76,821us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,404us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,855us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,163us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options (in shares)	91klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsStockOptions	100klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsStockOptions	93klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsStockOptions	109klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsStockOptions
Time-based restricted stock (in shares)	322klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsTimebasedRestrictedStock	289klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsTimebasedRestrictedStock	242klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsTimebasedRestrictedStock	293klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsTimebasedRestrictedStock
Market-based restricted stock (in shares)	336klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsMarketbasedRestrictedStock	228klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsMarketbasedRestrictedStock	298klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsMarketbasedRestrictedStock	212klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsMarketbasedRestrictedStock
Weighted average shares outstanding - Diluted	77,570us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	77,021us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	77,488us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	76,777us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
EPS:
Net income per share - Basic (in dollars per share)	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Effect of dilutive shares (in dollars per share)	$ 0.00klic_EarningsPerShareDilutedAdjustment	$ 0.00klic_EarningsPerShareDilutedAdjustment	$ 0.01klic_EarningsPerShareDilutedAdjustment	$ 0.00klic_EarningsPerShareDilutedAdjustment
Net income per share - Diluted (in dollars per share)	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted

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