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BUSINESS SEGMENT INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
segment
Mar. 29, 2014
Segment Reporting Information, by Segment    
Number of operating segments 3us-gaap_NumberOfOperatingSegments  
Sales to external customers $ 156,655us-gaap_SalesRevenueNet $ 146,890us-gaap_SalesRevenueNet
Segment income 13,629us-gaap_OperatingIncomeLoss 12,526us-gaap_OperatingIncomeLoss
Photonics    
Segment Reporting Information, by Segment    
Sales to external customers 64,238us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= newp_PhotonicsMember		 59,470us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= newp_PhotonicsMember
Lasers    
Segment Reporting Information, by Segment    
Sales to external customers 49,859us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= newp_LasersMember		 46,474us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= newp_LasersMember
Optics    
Segment Reporting Information, by Segment    
Sales to external customers 42,558us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= newp_OpticsMember		 40,946us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= newp_OpticsMember
Operating segments    
Segment Reporting Information, by Segment    
Segment income 27,436us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 23,682us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Operating segments | Photonics    
Segment Reporting Information, by Segment    
Segment income 17,152us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= newp_PhotonicsMember		 13,546us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= newp_PhotonicsMember
Operating segments | Lasers    
Segment Reporting Information, by Segment    
Segment income 5,624us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= newp_LasersMember		 5,580us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= newp_LasersMember
Operating segments | Optics    
Segment Reporting Information, by Segment    
Segment income $ 4,660us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= newp_OpticsMember		 $ 4,556us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= newp_OpticsMember