Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2022	May 23, 2022	Sep. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity File Number	1-34167
Entity Registrant Name	ePlus inc.
Entity Central Index Key	0001022408
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	54-1817218
Entity Address, Address Line One	13595 Dulles Technology Drive
Entity Address, City or Town	Herndon
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20171-3413
City Area Code	703
Local Phone Number	984-8400
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	PLUS
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 1,355,245,489
Entity Common Stock, Shares Outstanding		26,818,561
ICFR Auditor Attestation Flag	true
Auditor Name	DELOITTE & TOUCHE LLP
Auditor Location	McLean, Virginia
Auditor Firm ID	34