Consolidated leverage ratio maximum.

No definition available.

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- Definition

Debt instruments maturity date month and year.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Increases Decrease in Line of Credit Facility.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Line of credit facility accordion feature.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt classified as current. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	novt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: 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

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ 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

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

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Debt - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended
Debt - Additional Information (Details) - USD ($)	Feb. 26, 2018	Aug. 31, 2017	Mar. 30, 2018	Dec. 31, 2017	Jul. 28, 2017	May 19, 2016
Debt Instrument [Line Items]
Long-term debt including current maturities			$ 233,221,000	$ 234,619,000
Term Loan
Debt Instrument [Line Items]
Current portion of long-term debt			$ 9,200,000	$ 9,200,000
Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	300.00%
Second Amended and Restated Credit Agreement \| Permitted Acquisitions and Stock Repurchases
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	250.00%
Second Amended and Restated Credit Agreement \| Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	300.00%
Second Amended and Restated Credit Agreement \| Four Consecutive Quarters Following Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	350.00%
Second Amended and Restated Credit Agreement \| Term Loan
Debt Instrument [Line Items]
Long-term debt including current maturities					$ 65,600,000
Second Amended and Restated Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 225,000,000
Third Amendment
Debt Instrument [Line Items]
Debt instrument, frequency of periodic payment			quarterly
Revolving credit facility maturity year			2021-05
Third Amendment \| Term Loan
Debt Instrument [Line Items]
Long-term debt including current maturities		$ 90,600,000
Quarterly installments payable on term loan		2,300,000
Debt instrument, final installment amount		56,100,000
Current portion of long-term debt			$ 9,200,000
Third Amendment \| Revolving Credit Facility
Debt Instrument [Line Items]
Increases the revolving credit facility		100,000,000
Maximum borrowing capacity		325,000,000
Line of credit facility accordion feature		$ 125,000,000
Fourth Amendment
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	350.00%
Fourth Amendment \| Permitted Acquisitions and Stock Repurchases
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	300.00%
Fourth Amendment \| Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	350.00%
Fourth Amendment \| Four Consecutive Quarters Following Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	400.00%