Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2017	Aug. 25, 2017
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
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
Class A
Entity Common Stock, Shares Outstanding (in shares)		97,037,611
Class B
Entity Common Stock, Shares Outstanding (in shares)		114,445,493