Document and Entity Information - USD ($)	12 Months Ended
	Feb. 03, 2018	Mar. 28, 2018	Jul. 29, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Feb. 03, 2018
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	TLYS
Entity Registrant Name	TILLY'S, INC.
Entity Central Index Key	0001524025
Current Fiscal Year End Date	--02-03
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 131,459,893
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		15,106,824
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		14,028,497