Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Jan. 31, 2019	Mar. 18, 2019	Jul. 31, 2018
Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	PSTG
Entity Registrant Name	Pure Storage, Inc.
Entity Central Index Key	0001474432
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 4.6
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Class A common stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		244,930,555.00
Class B common stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		0