LEASES (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 31, 2020 ft²	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Feb. 28, 2014 ft²
Lessee Lease Description [Line Items]
Lessee, operating lease, option to terminate				The prior lease agreement for this facility provided the lessor the right to terminate the lease agreement at any time with 12 months’ notice to Orion. As a result, the agreement was previously classified as a short-term lease.
Lessee, operating lease, existence of option to terminate				true
Operating lease costs | $		$ 0.2	$ 0.1	$ 0.4	$ 0.3
Lessor, Operating Lease, Existence of Option to Extend [true false]				true
Manitowoc, WI
Lessee Lease Description [Line Items]
Area of leased property	266,000
Lease term of agreement	10 years
Lessee, sale leaseback, option to terminate, minimum period	6 years
Jacksonville Florida
Lessee Lease Description [Line Items]
Area of operating leased property						10,500
Termination of lease				Jun. 30, 2023