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Acquisitions (Details) (Crane Technical Materials, USD $)
In Millions, unless otherwise specified
0 Months Ended
Jul. 01, 2014
Crane Technical Materials
 
Acquisitions  
Purchase price of equity $ 72us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= np_CraneTechnicalMaterialsMember