Document and Entity Information - USD ($)	12 Months Ended
	Jan. 25, 2020	May 15, 2020	Jul. 26, 2019
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Jan. 25, 2020
Entity File Number	001-37849
Entity Registrant Name	AT HOME GROUP INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-3229563
Entity Address, Address Line One	1600 East Plano Parkway
Entity Address, City or Town	Plano
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75074
City Area Code	972
Local Phone Number	265-6227
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	HOME
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		64,185,751
Entity Public Float			$ 325,478,429
Current Fiscal Year End Date	--01-25
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001646228
Amendment Flag	false