Document and Entity Information - shares	9 Months Ended
	Oct. 31, 2017	Nov. 30, 2017
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2017
Document Fiscal Year Focus	2018
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
Class A
Entity Common Stock, Shares Outstanding (in shares)		112,788,614
Class B
Entity Common Stock, Shares Outstanding (in shares)		103,994,591