FAIR VALUE DISCLOSURES Fair Value of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Debt balance, gross	$ 1,448,624	$ 1,513,999
Debt Instrument, Fair Value Disclosure	942,956	1,495,972
Unamortized discount	33,400
Senior Notes \| 8.75% Senior Secured Notes
Debt Instrument [Line Items]
Debt balance, gross	347,400	346,610
Debt Instrument, Fair Value Disclosure	252,000	353,500
Unamortized discount	2,600	3,400
Senior Notes \| 6¼% Senior Notes
Debt Instrument [Line Items]
Debt balance, gross	401,535	401,535
Debt Instrument, Fair Value Disclosure	75,288	325,243
Convertible debt \| 4½% Convertible Senior Notes
Debt Instrument [Line Items]
Debt balance, gross	112,944	107,397
Debt Instrument, Fair Value Disclosure	28,923	158,772
Unamortized discount	30,806	36,353
Secured Debt \| Lombard Debt
Debt Instrument [Line Items]
Debt balance, gross	183,450	211,087
Debt Instrument, Fair Value Disclosure	183,450	211,087
Secured Debt \| Macquarie Debt
Debt Instrument [Line Items]
Debt balance, gross	171,028	185,028
Debt Instrument, Fair Value Disclosure	171,028	185,028
Secured Debt \| PK Air Debt
Debt Instrument [Line Items]
Debt balance, gross	212,041	230,000
Debt Instrument, Fair Value Disclosure	212,041	230,000
Other Debt \| Airnorth Debt
Debt Instrument [Line Items]
Debt balance, gross	11,058	13,832
Debt Instrument, Fair Value Disclosure	11,058	13,832
Other Debt \| Eastern Airways Debt
Debt Instrument [Line Items]
Debt balance, gross	0	14,519
Debt Instrument, Fair Value Disclosure	0	14,519
Other Debt \| Other Debt
Debt Instrument [Line Items]
Debt balance, gross	9,168	3,991
Debt Instrument, Fair Value Disclosure	$ 9,168	$ 3,991

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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+ References

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Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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