FAIR VALUE DISCLOSURES - Fair Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	$ 1,474,539	$ 1,513,999
Fair value of total debt	1,395,898	1,495,972
Senior Notes \| 8.75% Senior Secured Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	347,006	346,610
Fair value of total debt	342,125	353,500
Unamortized discount	3,000	3,400
Senior Notes \| 6¼% Senior Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	401,535	401,535
Fair value of total debt	293,121	325,243
Convertible Debt \| 4½% Convertible Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	110,102	107,397
Fair value of total debt	144,756	158,772
Unamortized discount	33,648	36,353
Secured Debt \| Lombard Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	189,909	211,087
Fair value of total debt	189,909	211,087
Secured Debt \| Macquarie Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	178,028	185,028
Fair value of total debt	178,028	185,028
Secured Debt \| PK Air Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	221,161	230,000
Fair value of total debt	221,161	230,000
Other Debt \| Airnorth Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	12,434	13,832
Fair value of total debt	12,434	13,832
Other Debt \| Eastern Airways Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	7,531	14,519
Fair value of total debt	7,531	14,519
Other Debt \| Other Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	6,833	3,991
Fair value of total debt	$ 6,833	$ 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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- Definition

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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- Definition

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+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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