FAIR VALUE DISCLOSURES - Assets at Fair Value On A Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	$ 133,993		$ 133,993		$ 124,911
Assets held for sale	31,038		31,038		38,246
Goodwill	20,299		20,299		$ 19,798
Inventory write-down	0	$ 0	(1,192)	$ (7,572)
Impairment charges on aircraft held for sale	(1,560)	(200)	(11,307)	(11,360)
Goodwill, Impairment Loss		(8,706)	0	(8,706)
Loss on sale of assets and asset impairment charges	(1,560)	(8,906)	(12,499)	(27,638)
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	0	46,654	0	46,654
Assets held for sale	31,038	37,635	31,038	37,635
Goodwill		18,793		18,793
Total assets	31,038	103,082	31,038	103,082
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	0	0	0	0
Assets held for sale	0	0	0	0
Goodwill		0		0
Total assets	0	0	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	0	46,654	0	46,654
Assets held for sale	0	37,635	0	37,635
Goodwill		0		0
Total assets	0	84,289	0	84,289
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	0	0	0	0
Assets held for sale	31,038	0	31,038	0
Goodwill		18,793		18,793
Total assets	$ 31,038	$ 18,793	$ 31,038	$ 18,793