OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Property and Equipment Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Property and equipment [Line Items]
Construction in Progress, Gross	$ 67,710	$ 199,275
Aircraft | Minimum
Property and equipment [Line Items]
Property, Plant and Equipment, Salvage Value, Percentage	30.00%
Property, Plant and Equipment, Useful Life	5 years
Aircraft | Maximum
Property and equipment [Line Items]
Property, Plant and Equipment, Salvage Value, Percentage	50.00%
Property, Plant and Equipment, Useful Life	15 years
Building | Minimum
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Building | Maximum
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Other Capitalized Property Plant and Equipment | Minimum
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Other Capitalized Property Plant and Equipment | Maximum
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years