v2.4.0.8
Document And Entity Information
9 Months Ended
Sep. 28, 2014
Oct. 28, 2014
Entity Information [Line Items]    
Entity Registrant Name BLUE NILE INC  
Entity Central Index Key 0001091171  
Document Type 10-Q  
Document Period End Date Sep. 28, 2014  
Amendment Flag false  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --01-04  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   11,845,623