Debt Instrument, Covenant, Debt to EBITDA, Maximum

No definition available.

Name:	kn_DebtInstrumentCovenantDebttoEBITDAMaximum
Namespace Prefix:	kn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Covenant, EBITDA to Interest Ratio, Minimum

+ References

No definition available.

+ Details

Name:	kn_DebtInstrumentCovenantEBITDAtoInterestRatioMinimum
Namespace Prefix:	kn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum

+ References

No definition available.

+ Details

Name:	kn_DebtInstrumentCovenantSeniorSecuredLeverageRatioMaximum
Namespace Prefix:	kn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

[Line Items] for Schedule of Term Loan and Revolving Credit Facilities [Table]

+ References

No definition available.

+ Details

Name:	kn_ScheduleOfRevolvingCreditFacilitiesLineItems
Namespace Prefix:	kn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares Issued During Period, Value, Exercise of Warrants

+ References

No definition available.

+ Details

Name:	kn_SharesIssuedDuringPeriodValueExerciseOfWarrants
Namespace Prefix:	kn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 470
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481544/470-10-50-1

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_TreasuryStockCommonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=kn_CreditFacilityDueJanuary22024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=kn_LondonInterbankOfferedRateLIBORPriorTo2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=kn_CreditFacilityDueFebruary82028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=kn_ApplicableMarginAlternateBaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings Schedule of Revolving Credit Facility (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Line of Credit		$ 45,000,000.0
Debt Instrument, Covenant, EBITDA to Interest Ratio, Minimum		3.00
Debt Instrument, Covenant, Debt to EBITDA, Maximum		3.75
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum		3.25
Line of Credit Facility, Commitment Fee Percentage			0.23%
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year		$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two		0
Long-term Debt, Maturities, Repayments of Principal in Year Four		0
Long-term Debt, Maturities, Repayments of Principal in Year Five		$ 0
Shares Issued During Period, Value, Exercise of Warrants			$ 0
Treasury Stock, Common
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Shares Issued During Period, Value, Exercise of Warrants	$ (3,100,000)		$ (3,100,000)
Line of Credit \| Weighted Average
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.23%
Credit Facility due January 2, 2024 [Member] \| London Interbank Offered Rate LIBOR prior to 2023
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time			2.18%
Credit Facility due January 2, 2024 [Member] \| Line of Credit
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Line of Credit		$ 45,000,000.0		$ 45,000,000.0
Credit Facility due February 8, 2028
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000,000
Credit Facility due February 8, 2028 \| Minimum [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.225%
Credit Facility due February 8, 2028 \| Minimum [Member] \| Applicable margin alternate base rate [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Credit Facility due February 8, 2028 \| Maximum [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.35%
Credit Facility due February 8, 2028 \| Maximum [Member] \| Applicable margin alternate base rate [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%