Cover Page - USD ($) $ in Billions	12 Months Ended
	Feb. 02, 2020	Mar. 26, 2020	Aug. 02, 2019
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Period End Date	Feb. 02, 2020
Document Transition Report	false
Entity File Number	001-38936
Entity Registrant Name	CHEWY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-1020167
Entity Address, Address Line One	1855 Griffin Road, Suite B-428
Entity Address, City or Town	Dania Beach
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33004
City Area Code	786
Local Phone Number	320-7111
Title of 12(b) Security	Class A Common Stock, par value $0.01 per share
Trading Symbol	CHWY
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1.7
Documents Incorporated by Reference	Portions of the registrant’s Definitive Proxy Statement relating to the Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The registrant's Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended February 2, 2020.
Entity Central Index Key	0001766502
Amendment Flag	false
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--02-02
Document Fiscal Year Focus	2019
Class A Common Stock, $0.01 par value per share
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		66,478,642
Class B Common Stock, $0.01 par value per share
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		334,922,454