Cover - USD ($) $ in Billions	12 Months Ended
	Jan. 31, 2021	Mar. 18, 2021	Aug. 02, 2020
Document And Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 31, 2021
Current Fiscal Year End Date	--01-31
Document Transition Report	false
Entity File Number	001-37570
Entity Registrant Name	Pure Storage, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-1069557
Entity Address, Address Line One	650 Castro Street
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Mountain View
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94041
City Area Code	800
Local Phone Number	379-7873
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	PSTG
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	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 4.4
Entity Common Stock, Shares Outstanding (in shares)		280,335,794
Documents Incorporated by Reference	Portions of the registrant’s proxy statement for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended January 31, 2021.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001474432