Debt Covenant, Cash And Cash Equivalents Threshold

No definition available.

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- Definition

Debt Instrument, Periodic Payment, Increase (Decrease) in Principal

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Debt Instrument, Security Interest Pledged, Percentage

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Term If Balloon Not Considered

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant Compliance, Maximum Consolidated Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Dispositions Not Reinvested, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Receipts Greater than 250 Thousand Dollars, Non-ordinary Business, Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Stated Equity Issuance, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Long-term debt, Repayment of Principal in connection with Amendment

+ References

No definition available.

+ Details

Name:	kvhi_LongtermdebtRepaymentofPrincipalinconnectionwithAmendment
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of Financial Covenants

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Repayments of Long-term loan

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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Period Type:	instant

- 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

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, 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
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

+ 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://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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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+ Details

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Balance Type:	debit
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- Definition

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

+ References

+ Details

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- Details

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- Details

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- Details

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Debt (Details)					3 Months Ended		27 Months Ended
Debt (Details)	Feb. 28, 2018 USD ($)	Jul. 02, 2014 USD ($)	Jul. 01, 2014	Apr. 06, 2009 USD ($)	Mar. 31, 2018 USD ($) covenant	Mar. 31, 2017 USD ($)	Jul. 01, 2019 USD ($)	Apr. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)	Apr. 01, 2010 Swap_Agreements
Debt Instrument [Line Items]
Long-term Debt					$ 44,185,000				$ 47,054,000
Long-term Debt					6,000,000
Long-term Debt, Current Maturities					2,484,000				2,482,000
Long-term debt, excluding current portion					41,701,000				44,572,000
Line of Credit Facility, Current Borrowing Capacity					15,000,000
Prepayment on Term Loan as a result of the SJC stock purchase agreement	$ 2,000				2,825,000	$ 7,625,000
Sale of treasury stock	$ 4,500,000				4,500,000	$ 0
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term			5 years
Term note \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 41,450,000				44,275,000
Term note \| Senior Credit Facility [Member] \| Term note
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 80,000,000
Long-term Line of Credit		30,000,000
Proceeds from Lines of Credit		$ 250,000
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Dispositions Not Reinvested, Percentage		100.00%
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Stated Equity Issuance, Percentage		50.00%
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Receipts Greater than 250 Thousand Dollars, Non-ordinary Business, Percentage		100.00%
Number of Financial Covenants \| covenant					2
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Fixed Charge Coverage Ratio					1.25
Term note \| Senior Credit Facility [Member] \| Term note \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.75%
Term note \| Senior Credit Facility [Member] \| Term note \| Maximum \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.25%
Term note \| Senior Credit Facility [Member] \| Term note \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Leverage Ratio					1.50
Term note \| Senior Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 15,000,000
Term note \| Senior Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 65,000,000
Debt Instrument, Security Interest Pledged, Percentage			65.00%
Mortgage loan
Debt Instrument [Line Items]
Long-term Debt					$ 2,735,000				$ 2,779,000
Mortgage loan \| Mortgage Loan On Headquarters Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term				10 years
Debt Instrument, Periodic Payment, Principal					$ 15,000
Number of Financial Covenants \| covenant					1
Debt Instrument, Face Amount				$ 4,000,000
Debt Instrument, Term If Balloon Not Considered				20 years
Debt Instrument, Periodic Payment, Increase (Decrease) in Principal					$ 1,000
Derivative, Number of Instruments Held \| Swap_Agreements										2
Mortgage loan \| Mortgage Loan On Headquarters Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.00%
Mortgage loan \| Mortgage Loan On Headquarters Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Covenant, Cash And Cash Equivalents Threshold					$ 25,000,000
Mortgage loan \| Mortgage Loan On Headquarters Facility [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage									6.07%	6.07%
Mortgage loan \| Mortgage Loan On Headquarters Facility [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage									5.905%	5.905%
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal							$ 575,000
Scenario, Forecast [Member] \| Mortgage loan \| Mortgage Loan On Headquarters Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid								$ 2,551,000