FAIR VALUE DISCLOSURES - Fair Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	$ 1,597,052	$ 1,448,624
Fair value of total debt	1,090,478	942,956
Senior Notes \| 8.75% Senior Secured Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	273,449	347,400
Fair value of total debt	269,678	252,000
Unamortized discount	1,700	2,600
Senior Notes \| 6¼% Senior Notes due 2022 (1)(2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	401,535	401,535
Fair value of total debt	28,107	75,288
Convertible Debt \| 4½% Convertible Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	143,750	112,944
Fair value of total debt	14,375	28,923
Unamortized discount	0	30,806
Secured Debt \| Lombard Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	167,519	183,450
Fair value of total debt	167,519	183,450
Secured Debt \| Macquarie Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	164,028	171,028
Fair value of total debt	164,028	171,028
Secured Debt \| PK Air Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	202,634	212,041
Fair value of total debt	202,634	212,041
Other Debt \| Airnorth Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	9,416	11,058
Fair value of total debt	9,416	11,058
Other Debt \| Humberside Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	351	0
Fair value of total debt	351	0
Other Debt \| Other Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	9,370	9,168
Fair value of total debt	9,370	9,168
Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt component - net carrying value	75,000	0
Fair value of total debt	$ 75,000	$ 0

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=118260190&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

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

+ 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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