ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Jun. 30, 2019
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION — The unaudited condensed consolidated financial statements include the accounts of ePlus inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The accounts of businesses acquired are included in the unaudited condensed consolidated financial statements from the dates of acquisition.
INTERIM FINANCIAL STATEMENTS	INTERIM FINANCIAL STATEMENTS — The unaudited condensed consolidated financial statements for the three months ended June 30, 2019 and 2018 were prepared by us, without audit, and include all normal and recurring adjustments that, in the opinion of management, are necessary for a fair presentation of our financial position, results of operations, changes in comprehensive income, and cash flows for such periods. Operating results for the three months ended June 30, 2019 and 2018 are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year ending March 31, 2020 or any other future period. These unaudited condensed consolidated financial statements do not include all disclosures required by the accounting principles generally accepted in the United States (“US GAAP”) for annual financial statements. Our audited consolidated financial statements are contained in our annual report on Form 10-K for the year ended March 31, 2019 (“2019 Annual Report”), which should be read in conjunction with these interim condensed consolidated financial statements.
USE OF ESTIMATES	USE OF ESTIMATES — The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting periods. Estimates are used when accounting for items and matters including, but not limited to, revenue recognition, residual values, vendor consideration, lease classification, goodwill and intangible assets, reserves for credit losses, inventory obsolescence, and the recognition and measurement of income tax assets and other provisions and contingencies. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from these estimates.
CONCENTRATIONS OF RISK	CONCENTRATIONS OF RISK — A substantial portion of our sales are products from Cisco Systems, which were 40% of our technology segment’s net sales for both the three months ended June 30, 2019 and 2018.
FINANCING REVENUE	FINANCING REVENUE — We account for leases to customers in accordance with Codification Topic 842. We utilize a portfolio approach by grouping many similar assets being leased to one customer together. We classify our leases as either sales-type leases or operating leases. We classify leases as sales-type leases if any one of five criteria are met, each of which indicate that the lease transfers control of the underlying asset to the lessee. We classify our other leases as operating leases. For sales-type leases, upon lease commencement, we recognize the present value of the lease payments and the residual asset discounted using the rate implicit in the lease. When we are financing equipment provided by another dealer, we typically do not have any selling profit or loss arising from the lease. When we are the dealer of the equipment being leased, we typically recognize revenue in the amount of the lease receivable and cost of sales in the amount of the carrying value of the underlying asset minus the unguaranteed residual asset. After the commencement date, we recognize interest income as part of net sales using the effective interest method. For operating leases, we recognize the underlying asset as an operating lease asset. We depreciate the asset on a straight-line basis to its estimated residual value over its estimated useful life. We recognized the lease payments over the lease term on a straight-line basis as part of net sales. In all our leases, we recognize variable lease payments, primarily reimbursement for property taxes associated with the leased asset, as part of net sales in the period in which the changes in facts and circumstances on which the variable lease payments are based occur. We exclude from revenues and expenses any sales taxes reimbursed by the lessee. We also finance third-party software and third-party services for our customers, which we classify as notes-receivable. We recognize interest income on our notes-receivable using the effective interest method. We account for transfers of our financial assets, including our lease receivables and notes receivable, under Codification Topic 860 Transfers and Servicing (“Codification Topic 860”). When a transfer meets all the requirements for sale accounting, we derecognize the financial asset and record a net gain or loss that is included in net sales.
LESSEE ACCOUNTING	LESSEE ACCOUNTING — We lease office space over initial terms typically between 3 and 6 years. At the lease commencement date, we recognize operating lease liabilities based on the present value of the future minimum lease payments. In determining the present value of future minimum lease payments, we use our incremental borrowing rate based on the information available at the commencement date. When the future minimum payments encompass non-lease components, we account for the lease and non-lease components as a single lease component. We elected not to recognize right-of-use assets and lease liabilities for leases with an initial term of 12 months or less. We recognize lease expense on a straight-line basis over the lease term beginning on the commencement date.