Document and Entity Information - shares	9 Months Ended
	Oct. 31, 2015	Dec. 04, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	TLYS
Entity Registrant Name	TILLY'S, INC.
Entity Central Index Key	0001524025
Current Fiscal Year End Date	--01-30
Entity Filer Category	Accelerated Filer
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		12,305,036
Common Stock (Class B)
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,169,097