FAIR VALUE DISCLOSURES (Details) $ in Thousands	3 Months Ended
Jun. 30, 2017 USD ($) aircraft	Jun. 30, 2016 USD ($) aircraft	Mar. 31, 2017 USD ($)
Fair Value [Line Items]
Inventories	$ 130,479		$ 124,911
Assets held for sale	34,585		38,246
Impairment charges on aircraft held for sale	(1,564)	$ (10,149)
Loss on sale of assets and asset impairment charges	$ (2,756)	$ (10,149)
Number of aircraft impaired \| aircraft	2	11
Inventory Write-down	$ (1,192)
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	1,303,684		1,293,364
Fair value of total debt	1,155,116		1,215,065
Senior Notes [Member] \| Senior Notes Due 2022
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	401,535		401,535
Fair value of total debt	252,967		323,236
Term Loan [Member]
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	253,180		261,907
Fair value of total debt	253,180		261,907
Term Loan Credit Facility [Member]
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	45,900		45,900
Fair value of total debt	45,900		45,900
Revolving Credit Facility [Member]
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	174,500		139,100
Fair value of total debt	174,500		139,100
Unsecured Debt [Member] \| Lombard Debt
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	202,514		196,832
Fair value of total debt	202,514		196,832
Unsecured Debt [Member] \| Macquarie Credit Agreement
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	195,528		200,000
Fair value of total debt	195,528		200,000
Other Debt
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	0		16,293
Other Debt \| Airnorth debt
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	15,826		16,471
Fair value of total debt	15,826		16,471
Other Debt \| Eastern Airways debt
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	14,701		15,326
Fair value of total debt	14,701		15,326
Other Debt \| Other Debt
Debt Instrument, Fair Value Disclosure [Abstract]
Carrying value of total debt	0		16,293
Fair value of total debt	0		16,293
Fair Value, Measurements, Recurring [Member]
Fair Value [Line Items]
Rabbi Trust investments	2,201		3,075
Total Assets Recurring	2,201		3,075
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value [Line Items]
Rabbi Trust investments	2,201		3,075
Total Assets Recurring	2,201		3,075
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value [Line Items]
Rabbi Trust investments	0		0
Total Assets Recurring	0		0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value [Line Items]
Rabbi Trust investments	0		0
Total Assets Recurring	0		$ 0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value [Line Items]
Inventories	1,252
Assets held for sale	34,585	$ 40,572
Total Assets Non Recurring	35,837	40,572
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value [Line Items]
Inventories	0
Assets held for sale	0	0
Total Assets Non Recurring	0	0
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value [Line Items]
Inventories	1,252
Assets held for sale	34,585	40,572
Total Assets Non Recurring	35,837	40,572
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value [Line Items]
Inventories	0
Assets held for sale	0	0
Total Assets Non Recurring	$ 0	$ 0

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