Document and Entity Information - shares	9 Months Ended
	Oct. 31, 2018	Nov. 28, 2018
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
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 Small Business	false
Entity Emerging Growth Company	false
Class A
Entity Common Stock, Shares Outstanding (in shares)		216,507,814
Class B
Entity Common Stock, Shares Outstanding (in shares)		25,108,923