Segments - Revenues and Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Corporate and Other
Revenues	$ 18,670	$ 15,728	$ 34,304	$ 32,316
Operating Income (Loss)	(996)	(3,566)	(4,247)	(7,170)
Orion U.S. Markets
Corporate and Other
Revenues	5,192	9,872	11,094	21,506
Operating Income (Loss)	263	(866)	191	(828)
Orion Engineered Systems
Corporate and Other
Revenues	6,975	5,774	13,774	10,604
Operating Income (Loss)	(116)	(1,152)	(796)	(2,818)
Orion Distribution Services
Corporate and Other
Revenues	6,503	82	9,436	206
Operating Income (Loss)	441	(94)	(361)	(159)
Corporate and Other
Corporate and Other
Revenues	0	0	0	0
Operating Income (Loss)	$ (1,584)	$ (1,454)	$ (3,281)	$ (3,365)