Cover - shares	3 Months Ended
	Apr. 30, 2024	May 24, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Apr. 30, 2024
Document Transition Report	false
Entity File Number	001-38977
Entity Registrant Name	PHREESIA, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-2275479
Entity Address, Address Line One	1521 Concord Pike
Entity Address, Address Line Two	Suite 301 PMB 221
Entity Address, City or Town	Wilmington
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19803
City Area Code	888
Local Phone Number	654-7473
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	PHR
Security Exchange Name	NYSE
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		57,397,904
Amendment Flag	false
Entity Central Index Key	0001412408
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--01-31