Purchase price to market price matching percentage.

No definition available.

Name:	oesx_EmployeeStockPurchasePlanPurchasePriceToMarketPriceMatchingPercentage
Namespace Prefix:	oesx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Employee stock purchase plans shares authorized.

+ References

No definition available.

+ Details

Name:	oesx_EmployeeStockPurchasePlansSharesAuthorized
Namespace Prefix:	oesx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum amount limit for employee stock purchase plan per employee.

+ References

No definition available.

+ Details

Name:	oesx_MaximumAmountLimitForEmployeeStockPurchasePlanPerEmployee
Namespace Prefix:	oesx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Proceeds from issuance of debt or sale of equity securities.

+ References

No definition available.

+ Details

Name:	oesx_ProceedsFromIssuanceOfDebtOrSaleOfEquitySecurities
Namespace Prefix:	oesx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_EquityClassOfTreasuryStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=oesx_AtMarketIssuanceSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)	12 Months Ended
SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Aug. 31, 2010
Equity Class Of Treasury Stock [Line Items]
Employee stock purchase plan, shares authorized					2,500,000
Maximum amount limit for ESPP per employee					$ 20,000
Purchase price to market price matching percentage					100.00%
Issuance of common stock in connection with acquisition	$ 0	$ 800,000	$ 0
At Market Issuance Sales Agreement
Equity Class Of Treasury Stock [Line Items]
Sale of share	0
Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Proceeds from issuance of debt or sale of equity securities		$ 100,000,000
Maximum [Member] \| At Market Issuance Sales Agreement
Equity Class Of Treasury Stock [Line Items]
Issuance of common stock in connection with acquisition				$ 50,000,000