GOODWILL AND OTHER INTANGIBLE ASSETS, Other Intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Other Intangible Assets [Abstract]
Intangibles assets, Gross carrying amount	$ 73,463		$ 73,463		$ 67,595
Intangibles Assets, Accumulated amortization / Impairment Loss	(33,669)		(33,669)		(28,667)
Intangible assets, Net Carrying Amount	39,794		39,794		38,928
Total amortization expense for other intangible assets	2,500	$ 1,800	$ 4,900	$ 3,100
ABS Technology [Member]
Other Intangible Assets [Abstract]
Estimated useful life			7 years
Intangible assets acquired			$ 5,700
Customer Relationships and Other Intangibles [Member]
Other Intangible Assets [Abstract]
Intangibles assets, Gross carrying amount	62,989		62,989		57,407
Intangibles Assets, Accumulated amortization / Impairment Loss	(28,308)		(28,308)		(23,865)
Intangible assets, Net Carrying Amount	34,681		$ 34,681		33,542
Customer Relationships and Other Intangibles [Member] | Minimum [Member]
Other Intangible Assets [Abstract]
Estimated useful life			5 years
Customer Relationships and Other Intangibles [Member] | Maximum [Member]
Other Intangible Assets [Abstract]
Estimated useful life			10 years
Capitalized Software Development [Member]
Other Intangible Assets [Abstract]
Intangibles assets, Gross carrying amount	10,474		$ 10,474		10,188
Intangibles Assets, Accumulated amortization / Impairment Loss	(5,361)		(5,361)		(4,802)
Intangible assets, Net Carrying Amount	$ 5,113		$ 5,113		$ 5,386
Estimated useful life			5 years