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v2.4.1.9

Segment Information - Information About Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 05, 2015 | Mar. 30, 2014
Segment Reporting Information [Line Items] |  |
Product revenue | $ 105,775 us-gaap_SalesRevenueGoodsNet | $ 83,569 us-gaap_SalesRevenueGoodsNet
Service revenue | 7,659 us-gaap_SalesRevenueServicesNet | 7,360 us-gaap_SalesRevenueServicesNet
Operating income | 23,917 us-gaap_OperatingIncomeLoss | 22,443 us-gaap_OperatingIncomeLoss
Operating Segments | MVSD |  |
Segment Reporting Information [Line Items] |  |
Product revenue | 97,494 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_MvsdMember | 77,618 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_MvsdMember
Service revenue | 3,879 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_MvsdMember | 3,698 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_MvsdMember
Operating income | 33,307 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_MvsdMember | 28,292 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_MvsdMember
Operating Segments | SISD |  |
Segment Reporting Information [Line Items] |  |
Product revenue | 8,281 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_SisdMember | 5,951 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_SisdMember
Service revenue | 3,780 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_SisdMember | 3,662 us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_SisdMember
Operating income | 1,896 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_SisdMember | 1,013 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = cgnx_SisdMember
Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Operating income | $ (11,286)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ (6,862)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember

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