FAIR VALUE DISCLOSURES - Assets at Fair Value On A Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories	$ 125,681		$ 129,614
Assets held for sale	23,502		30,348
Goodwill	19,175		$ 19,907
Inventory write-down		$ (1,192)
Impairment charges on aircraft held for sale	$ 0	(1,564)
Loss on sale of assets and asset impairment charges		(2,756)
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories		1,252
Assets held for sale		34,585
Total assets		35,837
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
Assets held for sale		0
Total assets		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		1,252
Assets held for sale		34,585
Total assets		35,837
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories		0
Assets held for sale		0
Total assets		$ 0