SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			$ (9,307)	$ (14,098)
Capital expenditures	$ (12,124)	$ (17,860)	(36,441)	(119,726)
Proceeds from asset dispositions	6,303	2,525	48,547	14,344
Proceeds from OEM cost recoveries			94,463	0
Deposits received on aircraft held for sale			0	290
Net cash provided by (used in) investing activities			106,569	(105,092)
Proceeds from borrowings			548,768	360,240
Debt issuance costs			(11,653)	(3,883)
Repayment of debt			(609,667)	(243,677)
Purchase of 4½% Convertible Senior Notes call option			(40,393)	0
Proceeds from issuance of warrants			30,259	0
Dividends paid			(2,465)	(7,366)
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			(36)	(38)
Dividends paid to noncontrolling interest			0	(2,533)
Payment of contingent consideration			0	(10,000)
Repurchases for tax withholdings on vesting of equity awards			(591)	(762)
Net cash provided by (used in) financing activities			(85,778)	91,981
Effect of exchange rate changes on cash and cash equivalents			9,708	(5,942)
Net increase (decrease) in cash and cash equivalents			21,192	(33,151)
Cash and cash equivalents at beginning of period			96,656	104,310
Cash and cash equivalents at end of period	117,848	71,159	117,848	71,159
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(922)	(2,947)
Capital expenditures			77,480	0
Proceeds from asset dispositions			(77,480)	0
Proceeds from OEM cost recoveries			0
Deposits received on aircraft held for sale				0
Net cash provided by (used in) investing activities			0	0
Proceeds from borrowings			0	0
Debt issuance costs			0	0
Repayment of debt			0	0
Purchase of 4½% Convertible Senior Notes call option			0
Proceeds from issuance of warrants			0
Dividends paid			0	0
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			0	0
Dividends paid to noncontrolling interest				0
Payment of contingent consideration				0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by (used in) financing activities			0	0
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			(922)	(2,947)
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	(922)	(2,947)	(922)	(2,947)
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(105,817)	(87,634)
Capital expenditures			(8,182)	(15,385)
Proceeds from asset dispositions			0	0
Proceeds from OEM cost recoveries			0
Deposits received on aircraft held for sale				0
Net cash provided by (used in) investing activities			(8,182)	(15,385)
Proceeds from borrowings			318,550	243,900
Debt issuance costs			(2,558)	(2,925)
Repayment of debt			(569,325)	(218,900)
Purchase of 4½% Convertible Senior Notes call option			(40,393)
Proceeds from issuance of warrants			30,259
Dividends paid			110,637	(7,010)
Increases (decreases) in cash related to intercompany advances and debt			291,969	55,910
Partial prepayment of put/call obligation			(36)	(38)
Dividends paid to noncontrolling interest				0
Payment of contingent consideration				0
Repurchases for tax withholdings on vesting of equity awards			(591)	(762)
Net cash provided by (used in) financing activities			138,512	70,175
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			24,513	(32,844)
Cash and cash equivalents at beginning of period			3,382	35,241
Cash and cash equivalents at end of period	27,895	2,397	27,895	2,397
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			34,995	39,771
Capital expenditures			(7,755)	(21,093)
Proceeds from asset dispositions			85,760	12,894
Proceeds from OEM cost recoveries			0
Deposits received on aircraft held for sale				290
Net cash provided by (used in) investing activities			78,005	(7,909)
Proceeds from borrowings			0	109,890
Debt issuance costs			(552)	0
Repayment of debt			(13,137)	(4,494)
Purchase of 4½% Convertible Senior Notes call option			0
Proceeds from issuance of warrants			0
Dividends paid			0	4
Increases (decreases) in cash related to intercompany advances and debt			(99,610)	(140,655)
Partial prepayment of put/call obligation			0	0
Dividends paid to noncontrolling interest				0
Payment of contingent consideration				0
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by (used in) financing activities			(113,299)	(35,255)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			(299)	(3,393)
Cash and cash equivalents at beginning of period			299	3,393
Cash and cash equivalents at end of period	0	0	0	0
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			62,437	36,712
Capital expenditures			(97,984)	(83,248)
Proceeds from asset dispositions			40,267	1,450
Proceeds from OEM cost recoveries			94,463
Deposits received on aircraft held for sale				0
Net cash provided by (used in) investing activities			36,746	(81,798)
Proceeds from borrowings			230,218	6,450
Debt issuance costs			(8,543)	(958)
Repayment of debt			(27,205)	(20,283)
Purchase of 4½% Convertible Senior Notes call option			0
Proceeds from issuance of warrants			0
Dividends paid			(113,102)	(360)
Increases (decreases) in cash related to intercompany advances and debt			(192,359)	84,745
Partial prepayment of put/call obligation			0	0
Dividends paid to noncontrolling interest				(2,533)
Payment of contingent consideration				(10,000)
Repurchases for tax withholdings on vesting of equity awards			0	0
Net cash provided by (used in) financing activities			(110,991)	57,061
Effect of exchange rate changes on cash and cash equivalents			9,708	(5,942)
Net increase (decrease) in cash and cash equivalents			(2,100)	6,033
Cash and cash equivalents at beginning of period			92,975	65,676
Cash and cash equivalents at end of period	$ 90,875	$ 71,709	$ 90,875	$ 71,709