FAIR VALUE DISCLOSURES Fair Value of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Debt balance, gross	$ 1,513,999	$ 1,293,364
Debt Instrument, Fair Value Disclosure	1,495,972	1,215,065
Unamortized discount	36,400
Senior Notes \| 8.75% Senior Secured Notes
Debt Instrument [Line Items]
Debt balance, gross	346,610	0
Debt Instrument, Fair Value Disclosure	353,500	0
Unamortized discount	3,400
Senior Notes \| 6¼% Senior Notes
Debt Instrument [Line Items]
Debt balance, gross	401,535	401,535
Debt Instrument, Fair Value Disclosure	325,243	323,236
Convertible debt \| 4½% Convertible Senior Notes
Debt Instrument [Line Items]
Debt balance, gross	107,397	0
Debt Instrument, Fair Value Disclosure	158,772	0
Unamortized discount	36,353
Term Loan \| Term Loan
Debt Instrument [Line Items]
Debt balance, gross	0	261,907
Debt Instrument, Fair Value Disclosure	0	261,907
Term Loan Credit Facility \| Term Loan Credit Facility
Debt Instrument [Line Items]
Debt balance, gross	0	45,900
Debt Instrument, Fair Value Disclosure	0	45,900
Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt balance, gross	0	139,100
Debt Instrument, Fair Value Disclosure	0	139,100
Secured Debt \| Lombard Debt
Debt Instrument [Line Items]
Debt balance, gross	211,087	196,832
Debt Instrument, Fair Value Disclosure	211,087	196,832
Secured Debt \| Macquarie Debt
Debt Instrument [Line Items]
Debt balance, gross	185,028	200,000
Debt Instrument, Fair Value Disclosure	185,028	200,000
Secured Debt \| PK Air Debt
Debt Instrument [Line Items]
Debt balance, gross	230,000	0
Debt Instrument, Fair Value Disclosure	230,000	0
Other Debt \| Airnorth Debt
Debt Instrument [Line Items]
Debt balance, gross	13,832	16,471
Debt Instrument, Fair Value Disclosure	13,832	16,471
Other Debt \| Eastern Airways Debt
Debt Instrument [Line Items]
Debt balance, gross	14,519	15,326
Debt Instrument, Fair Value Disclosure	14,519	15,326
Other Debt \| Other Debt
Debt Instrument [Line Items]
Debt balance, gross	3,991	16,293
Debt Instrument, Fair Value Disclosure	$ 3,991	$ 16,293

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

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant