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CASH AND CASH EQUIVALENTS (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Sep. 27, 2014 | Dec. 28, 2013 | Sep. 28, 2013
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Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | $ 622,590us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 587,981us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 550,598us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 521,788us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, Estimated Fair Value | 622,590us-gaap_CashAndCashEquivalentsFairValueDisclosure | 587,981us-gaap_CashAndCashEquivalentsFairValueDisclosure |  |
Short-term investments, Amortized Cost | 10,787us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 9,105us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |  |
Short-term investments, Estimated Fair Value | 10,787us-gaap_InvestmentsFairValueDisclosure | 9,105us-gaap_InvestmentsFairValueDisclosure |  |
Total cash, cash equivalents and short-term investments, Amortized Cost | 633,377us-gaap_CashCashEquivalentsAndShortTermInvestments | 597,086us-gaap_CashCashEquivalentsAndShortTermInvestments |  |
Total cash, cash equivalents and short-term investments, Estimated Fair Value | 633,377us-gaap_AssetsFairValueDisclosure | 597,086us-gaap_AssetsFairValueDisclosure |  |
Cash [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | 131,263us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 130,668us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |  |
Cash and cash equivalents, Estimated Fair Value | 131,263us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 130,668us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |  |
Cash equivalents, Money market funds [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | 327,742us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 295,529us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |  |
Cash and cash equivalents, Estimated Fair Value | 327,742us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 295,529us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |  |
Cash equivalents, Time deposits [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | 134,085us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_BankTimeDepositsMember | 132,284us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_BankTimeDepositsMember |  |
Cash and cash equivalents, Estimated Fair Value | 134,085us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_BankTimeDepositsMember | 132,284us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_BankTimeDepositsMember |  |
Commercial Paper [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents, Amortized Cost | 29,500us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember | 29,500us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember |  |
Cash and cash equivalents, Estimated Fair Value | 29,500us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember | 29,500us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember |  |
Short-term investments, Time deposits [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Short-term investments, Amortized Cost | 10,787us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = klic_InvestmentsTimeDepositsMember | 9,105us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = klic_InvestmentsTimeDepositsMember |  |
Short-term investments, Estimated Fair Value | $ 10,787us-gaap_InvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = klic_InvestmentsTimeDepositsMember | $ 9,105us-gaap_InvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = klic_InvestmentsTimeDepositsMember |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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