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Preferred and Common Shares and Share-based Compensation - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 11, 2026	Jun. 08, 2026	May 31, 2021	Jul. 03, 2026	Jun. 27, 2025	Jul. 03, 2026	Jun. 27, 2025	Dec. 31, 2025	Sep. 30, 2025	Feb. 29, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred shares, Authorized			7,000,000.0	7,000,000		7,000,000		7,000,000
Preferred shares, voting rights			one vote per share
Preferred shares, Issued				0		0		0
Preferred shares, outstanding				0		0		0
Repurchase of common stock						$ 18,638,000	$ 6,157,000
Share-based compensation expense recognized				$ 9,836,000	$ 7,498,000	19,632,000	14,598,000
Unrecognized stock-based compensation expense				54,600,000		$ 54,600,000
Unrecognized stock-based compensation expense, weighted-average recognition period						2 years 1 month 2 days
Private Placement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from issuance of private placement		$ 300,000,000
Placement agent fees and offering expenses		$ 12,400,000
Common shares purchased by the investors		2,142,857
Price per share		$ 140
Percentage of ownership after transaction		5.70%
Net proceeds from transaction	$ 287,600,000
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense recognized				612,000	459,000	$ 1,416,000	808,000
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense recognized				1,152,000	649,000	2,542,000	1,264,000
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense recognized				7,491,000	$ 6,390,000	15,093,000	12,526,000
Location, Statement of Income, Balance [Axis]: novt:RestructuringChargesAndAcquisitionRelatedCosts
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense recognized				$ 581,000		581,000
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units and Deferred Stock Units \| Board of Directors \| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense recognized						1,600,000	$ 1,600,000
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of stock units vested						$ 26,700,000
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units (RSUs) \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period						4 years
Amended and Restated 2010 Incentive Plan \| Restricted Stock Units (RSUs) \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period						0 years
Amended and Restated 2010 Incentive Plan \| Attainment-based PSUs \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares						200.00%
Amended and Restated 2010 Incentive Plan \| Attainment-based PSUs \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares						0.00%
Amended and Restated 2010 Incentive Plan \| Hybrid PSUs \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares						260.00%
Amended and Restated 2010 Incentive Plan \| Hybrid PSUs \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of percentage of shares to be issued upon settlement following vesting of target number of shares						0.00%
Amended and Restated 2010 Incentive Plan \| Performance Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of stock units vested						$ 7,600,000
Maximum number of common shares to be earned under these PSU grants				582,000		582,000
2020 Repurchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase program authorized amount										$ 50,000,000
Shares repurchased						88,000
Repurchase of common stock						$ 10,200,000
Shares repurchased, average cost per share						$ 116.13
2025 Repurchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock repurchase program authorized amount									$ 200,000,000
Shares repurchased						71,000
Repurchase of common stock						$ 8,400,000
Shares repurchased, average cost per share						$ 118.08
Available for share repurchases				$ 191,600,000		$ 191,600,000