SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
Jun. 30, 2024
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Orion Energy Systems, Inc. and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Orion have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and with the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments, considered necessary for a fair statement have been included. Interim results are not necessarily indicative of results that may be expected for the fiscal year ending March 31, 2025 or other interim periods. The Condensed Consolidated Balance Sheet as of March 31, 2024 has been derived from the audited consolidated financial statements at that date but does not include all of the information required by GAAP for complete financial statements. The accompanying unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in Orion’s Annual Report on Form 10-K for the fiscal year ended March 31, 2024 filed with the SEC on June 12, 2024.
Allowance for Credit Losses	Allowance for Credit Losses Orion performs ongoing evaluations of its customers and continuously monitors collections and payments. Orion estimates an allowance for credit losses based upon the historical collectability based on past due status and makes judgments about the creditworthiness of customers based on ongoing credit evaluations. We also consider customer-specific information, current market conditions, and reasonable and supportable forecasts of future economic conditions
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during that reporting period. Areas that require the use of significant management estimates include revenue recognition, net realizable value of inventory, allowance for credit losses, accruals for warranty and loss contingencies, earn-out, income taxes, impairment analyses, and certain equity transactions. Accordingly, actual results could differ from those estimates.
Concentration of Credit Risk and Other Risks and Uncertainties	Concentration of Credit Risk and Other Risks and Uncertainties Orion's cash is primarily deposited with one financial institution. At times, deposits in this institution exceeds the amount of insurance provided on such deposits. Orion has not experienced any losses in such accounts and believes that it is not exposed to any significant financial institution viability risk on these balances. Orion purchases components necessary for its lighting products, including lamps and LED components, from multiple suppliers. For the three months ended June 30, 2024, one supplier accounted for 14.0% of total cost of revenue, while no suppliers accounted for more than 10% of total cost of revenue for three months ended June 30, 2023. For the three months ended June 30, 2024, one customer accounted for 21.1% of total revenue. For the three months ended June 30, 2023, two customers accounted for 20.6% and 11.0% of total revenue, respectively. As of June 30, 2024, one customer accounted for 15.7% and two customers accounted for 10.1% of accounts receivable. As of March 31, 2024, two customers accounted for 17.3% and 11.7% of accounts receivable.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Standards In June 2016, the Financial Accounting Standards Board ("FASB:) issued accounting standards updates ("ASU") No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires an entity to assess impairment of its financial instruments based on its estimate of expected credit losses. Since the issuance of ASU 2016-13, the FASB released several amendments to improve and clarify the implementation guidance. The provisions of ASU 2016-13 and the related amendments are effective for Orion for fiscal years (and interim reporting periods within those years) beginning after December 15, 2022. Entities are required to apply these changes through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. Orion adopted ASU 2016-13 effective April 1, 2023. The effect of adoption was immaterial. Issued: Not Yet Adopted In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which modifies the disclosure and presentation requirements of reportable segments. The amendments in the update require the disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (the "CODM") and included within each reported measure of segment profit and loss. The amendments also require disclosure of all other segment items by reportable segment and a description of its composition. Additionally, the amendments require disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. This update is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. Orion is currently evaluating the impact that this guidance will have on the presentation of its consolidated financial statements and accompanying notes. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands disclosures in an entity's income tax rate reconciliation table and disclosures regarding cash taxes paid both in the U.S. and foreign jurisdictions. The update will be effective for annual periods beginning after December 15, 2025. Orion is currently evaluating the impact that this guidance will have on the presentation of its consolidated financial statements and accompanying notes.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Jun. 30, 2024

The consolidated financial statements include the accounts of Orion Energy Systems, Inc. and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements of Orion have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and with the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments, considered necessary for a fair statement have been included. Interim results are not necessarily indicative of results that may be expected for the fiscal year ending March 31, 2025 or other interim periods.

The Condensed Consolidated Balance Sheet as of March 31, 2024 has been derived from the audited consolidated financial statements at that date but does not include all of the information required by GAAP for complete financial statements.

The accompanying unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in Orion’s Annual Report on Form 10-K for the fiscal year ended March 31, 2024 filed with the SEC on June 12, 2024.

Allowance for Credit Losses

Orion performs ongoing evaluations of its customers and continuously monitors collections and payments. Orion estimates an allowance for credit losses based upon the historical collectability based on past due status and makes judgments about the creditworthiness of customers based on ongoing credit evaluations. We also consider customer-specific information, current market conditions, and reasonable and supportable forecasts of future economic conditions

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during that reporting period. Areas that require the use of significant management estimates include revenue recognition, net realizable value of inventory, allowance for credit losses, accruals for warranty and loss contingencies, earn-out, income taxes, impairment analyses, and certain equity transactions. Accordingly, actual results could differ from those estimates.

Concentration of Credit Risk and Other Risks and Uncertainties

Orion's cash is primarily deposited with one financial institution. At times, deposits in this institution exceeds the amount of insurance provided on such deposits. Orion has not experienced any losses in such accounts and believes that it is not exposed to any significant financial institution viability risk on these balances.

Orion purchases components necessary for its lighting products, including lamps and LED components, from multiple suppliers. For the three months ended June 30, 2024, one supplier accounted for 14.0% of total cost of revenue, while no suppliers accounted for more than 10% of total cost of revenue for three months ended June 30, 2023.

For the three months ended June 30, 2024, one customer accounted for 21.1% of total revenue. For the three months ended June 30, 2023, two customers accounted for 20.6% and 11.0% of total revenue, respectively.

As of June 30, 2024, one customer accounted for 15.7% and two customers accounted for 10.1% of accounts receivable. As of March 31, 2024, two customers accounted for 17.3% and 11.7% of accounts receivable.

Recent Accounting Pronouncements

Recently Adopted Standards

In June 2016, the Financial Accounting Standards Board ("FASB:) issued accounting standards updates ("ASU") No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires an entity to assess impairment of its financial instruments based on its estimate of expected credit losses. Since the issuance of ASU 2016-13, the FASB released several amendments to improve and clarify the implementation guidance. The provisions of ASU 2016-13 and the related amendments are effective for Orion for fiscal years (and interim reporting periods within those years) beginning after December 15, 2022. Entities are required to apply these changes through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. Orion adopted ASU 2016-13 effective April 1, 2023. The effect of adoption was immaterial.

Issued: Not Yet Adopted

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which modifies the disclosure and presentation requirements of reportable segments. The amendments in the update require the disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (the "CODM") and included within each reported measure of segment profit and loss. The amendments also require disclosure of all other segment items by reportable segment and a description of its composition. Additionally, the amendments require disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. This update is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. Orion is currently evaluating the impact that this guidance will have on the presentation of its consolidated financial statements and accompanying notes.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands disclosures in an entity's income tax rate reconciliation table and disclosures regarding cash taxes paid both in the U.S. and foreign jurisdictions. The update will be effective for annual periods beginning after December 15, 2025. Orion is currently evaluating the impact that this guidance will have on the presentation of its consolidated financial statements and accompanying notes.