v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Oct. 28, 2017
Nov. 30, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Oct. 28, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3  
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   14,448,294
Common Stock (Class B)    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   14,398,497