SEGMENTS (Reconciliation of Segment Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Corporate and Other
Revenues	$ 26,281	$ 48,322	$ 37,092	$ 90,700
Operating Income (Loss)	1,869	6,878	(176)	11,037
Operating Segments | Orion Engineered Systems
Corporate and Other
Revenues	18,470	42,306	20,726	77,094
Operating Income (Loss)	1,764	7,831	(86)	12,687
Operating Segments | Orion Distribution Services
Corporate and Other
Revenues	5,500	3,853	12,129	7,557
Operating Income (Loss)	926	(148)	1,678	(485)
Operating Segments | Orion U.S. Markets
Corporate and Other
Revenues	2,311	2,163	4,237	6,049
Operating Income (Loss)	304	271	385	1,172
Corporate and Other
Corporate and Other
Operating Income (Loss)	$ (1,125)	$ (1,076)	$ (2,153)	$ (2,337)