BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Intangible Assets (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2017 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 27,212
Foreign currency translation	337
Intangible assets - ending balance	27,549
Accumulated amortization of intangible assets - beginning balance	(21,476)
Amortization expense	(448)
Accumulated amortization of intangible assets - ending balance	$ (21,924)
Weighted average remaining contractual life, in years	5 years 2 months
Client contracts
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 8,169
Foreign currency translation	1
Intangible assets - ending balance	8,170
Accumulated amortization of intangible assets - beginning balance	(8,155)
Amortization expense	(10)
Accumulated amortization of intangible assets - ending balance	$ (8,165)
Weighted average remaining contractual life, in years	1 month
Client relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 12,752
Foreign currency translation	56
Intangible assets - ending balance	12,808
Accumulated amortization of intangible assets - beginning balance	(11,071)
Amortization expense	(152)
Accumulated amortization of intangible assets - ending balance	$ (11,223)
Weighted average remaining contractual life, in years	3 years 7 months
Trade name and trademarks
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 4,483
Foreign currency translation	245
Intangible assets - ending balance	4,728
Accumulated amortization of intangible assets - beginning balance	(908)
Amortization expense	(146)
Accumulated amortization of intangible assets - ending balance	$ (1,054)
Weighted average remaining contractual life, in years	13 years 1 month
Internally developed software
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 1,062
Foreign currency translation	28
Intangible assets - ending balance	1,090
Accumulated amortization of intangible assets - beginning balance	(685)
Amortization expense	(110)
Accumulated amortization of intangible assets - ending balance	$ (795)
Weighted average remaining contractual life, in years	1 year 9 months
Licenses
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 746
Foreign currency translation	7
Intangible assets - ending balance	753
Accumulated amortization of intangible assets - beginning balance	(657)
Amortization expense	(30)
Accumulated amortization of intangible assets - ending balance	$ (687)
Weighted average remaining contractual life, in years	1 year 7 months