This amount represents the combined annual rent and service charges for the maximum range of initial term.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This amount represents the combined annual rent and service charges for the minimum range of initial term.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Capital Lease Obligations, Interest Rate, Effective Percentage

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options

+ References

No definition available.

+ Details

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- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Represents percentage of building area agreed to lease from the landlord.

+ References

No definition available.

+ Details

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Namespace Prefix:	klic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of land held.

+ References

No definition available.

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Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Balance Type:
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DEBT AND OTHER OBLIGATIONS (Narrative) (Details) $ in Thousands	12 Months Ended
	Sep. 28, 2019 USD ($) renewal_option	Feb. 15, 2019 USD ($)	Sep. 29, 2018 USD ($)	Dec. 01, 2013 USD ($) ft²	Nov. 22, 2013 USD ($)
Debt Instrument [Line Items]
Area of Land \| ft²				198,000
Percentage Of Building Area Agreed To Lease From Landlord				70.00%
Short term debt	$ 60,904		$ 0
Financing obligation	$ 14,207		15,187	$ 20,000
K&S Corporate Headquarters [Member]
Debt Instrument [Line Items]
Lessee Leasing Arrangements, Capital Leases, Renewal Term	10 years
Annual Rent and Service Charge Minimum Range	$ 4,000
Annual Rent and Service Charge Maximum Range	$ 5,000
Lessee Leasing Arrangements, Capital Leases, Term of Contract	10 years
Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options \| renewal_option	2
Capital Lease Obligations, Interest Rate, Effective Percentage	6.30%
Building [Member]
Debt Instrument [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Citibank [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 5,000
Long-term Line of Credit	$ 3,100		$ 4,000
MUFG Bank, Ltd., Singapore Branch [Member] \| Facility Agreements [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 150,000
Current and Noncurrent Portion [Member]
Debt Instrument [Line Items]
Financing obligation	$ 15,000
London Interbank Offered Rate (LIBOR) [Member] \| MUFG Bank, Ltd., Singapore Branch [Member] \| Facility Agreements [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%