REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										$ 90,519	$ 74,418	$ 122,936
Revenue accounted for under other guidance	[1]									62	2,965	1,447
Total revenue		$ 26,411	$ 25,971	$ 20,586	$ 17,613	$ 21,629	$ 20,288	$ 17,560	$ 17,906	90,581	77,383	124,383
Revenues		$ 26,411	$ 25,971	$ 20,586	$ 17,613	$ 21,629	$ 20,288	$ 17,560	$ 17,906	90,581	77,383	124,383
Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										63,245	54,245	90,442
Revenue accounted for under other guidance	[1]									62	2,965	1,447
Total revenue										63,307	57,210	91,889
Revenues										63,307	57,210	91,889
Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										27,274	20,173	32,494
Revenue accounted for under other guidance	[1]									0	0	0
Total revenue										27,274	20,173	32,494
Revenues										27,274	20,173	32,494
Lighting product and installation
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										61,012	53,588	117,069
Lighting product and installation | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										50,229	46,500	89,827
Lighting product and installation | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										10,783	7,088	27,242
Maintenance services
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										17,147	14,555	5,825
Maintenance services | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										4,687	3,266	573
Maintenance services | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										12,460	11,289	5,252
Electric Vehicles
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										12,332	6,275	0
Electric Vehicles | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										8,301	4,479	0
Electric Vehicles | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										4,031	1,796	0
Solar energy related revenues
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										28	0	42
Solar energy related revenues | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										28	0	42
Solar energy related revenues | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers										$ 0	$ 0	$ 0

[1] Revenue accounted for under other guidance is recognized as Product revenue in the consolidated statements of operations and includes $0, $2.8 million, and $1.2 million derived from sales-type leases for light figures for the fiscal years ended March 31, 2024, 2023, and 2022, respectively; $0.1 million, $0.1 million, and $0.2 million derived from the sale of tax credits generated from Orion’s legacy operation for distributing solar energy for the fiscal years ended March 31, 2024, 2023, and 2022, respectively; and $0.1 million derived from the amortization of federal grants received in 2010 and 2011 as reimbursement for a portion of the costs to construct the legacy solar facilities for the fiscal years ended March 31, 2024, 2023, and 2022.