v3.7.0.1
Document and Entity Information - shares
6 Months Ended
Jul. 29, 2017
Aug. 25, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 29, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Trading Symbol TLYS  
Entity Registrant Name TILLY'S, INC.  
Entity Central Index Key 0001524025  
Current Fiscal Year End Date --02-03  
Entity Filer Category Accelerated Filer  
Class A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   13,874,419
Common Stock (Class B)    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   14,948,497