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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
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Dec. 27, 2014 | Dec. 28, 2013
NUMERATOR: |  |
Net income / (loss) | $ 7,842us-gaap_NetIncomeLoss | $ (1,957)us-gaap_NetIncomeLoss
DENOMINATOR: |  |
Weighted average shares outstanding - Basic (in shares) | 76,888us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 75,912us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options (in shares) | 94klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsStockOptions | 0klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsStockOptions
Time-based restricted stock (in shares) | 213klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsTimebasedRestrictedStock | 0klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsTimebasedRestrictedStock
Market-based restricted stock (in shares) | 237klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsMarketbasedRestrictedStock | 0klic_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsMarketbasedRestrictedStock
Weighted average shares outstanding - Diluted | 77,432us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 75,912us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
EPS: |  |
Net income per share - Basic (in dollars per share) | $ 0.10us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic
Effect of dilutive shares (in dollars per share) | $ 0.00klic_EarningsPerShareDilutedAdjustment | $ 0.00klic_EarningsPerShareDilutedAdjustment
Net income per share - Diluted (in dollars per share) | $ 0.10us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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