CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (77,149)	$ 88,707	$ 187,779
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	136,812	114,293	95,977
Deferred income tax	(51,643)	(7,457)	5,465
Write-off of deferred financing fees	0	660	12,733
Discount amortization on long-term debt	1,000	4,323	3,708
Loss on disposal of assets	30,693	35,849	722
Gain on sale of unconsolidated affiliates	0	(3,921)	(103,924)
Loss on impairment	55,104	7,167	12,669
Extinguishment of debt	0	2,591	0
Stock-based compensation	21,181	16,353	15,433
Equity in earnings from unconsolidated affiliates less than dividends received	2,619	9,418	1,629
Tax benefit related to stock-based compensation	0	(1,550)	(5,723)
Increase (decrease) in cash resulting from changes in:
Accounts receivable	46,608	24,112	3,647
Inventories	(3,380)	(21,478)	12,824
Prepaid expenses and other assets	493	(25,485)	(3,149)
Accounts payable	13,316	(4,665)	(5,154)
Accrued liabilities	(34,035)	29,461	11,697
Other liabilities and deferred credits	(25,593)	(15,152)	(14,239)
Net cash provided by operating activities	116,026	253,226	232,094
Cash flows from investing activities:
Capital expenditures	(372,375)	(601,834)	(628,613)
Acquisitions, net of cash received	0	(20,303)	(39,850)
Proceeds from sale of unconsolidated affiliates	0	4,185	112,210
Proceeds from asset dispositions	60,035	414,859	289,951
Investment in unconsolidated affiliate	(4,410)	0	0
Net cash used in investing activities	(316,750)	(203,093)	(266,302)
Cash flows from financing activities:
Proceeds from borrowings	928,802	454,393	533,064
Payments of contingent consideration	(9,453)	0	(6,000)
Debt issuance costs	(5,139)	0	(15,523)
Repayment of debt and debt redemption premiums	(677,003)	(460,274)	(512,492)
Proceeds from assignment of aircraft purchase agreements	0	0	106,113
Partial prepayment of put/call obligation	(55)	(59)	(57)
Acquisition of noncontrolling interests	(7,309)	(3,170)	(2,078)
Dividends paid to noncontrolling interest	(153)	0	0
Repurchase of Common Stock	0	(80,831)	(77,661)
Common stock dividends paid	(38,076)	(45,078)	(36,320)
Issuance of common stock	0	5,172	15,398
Tax benefit related to stock-based compensation	0	1,550	5,723
Net cash provided by (used in) financing activities	191,614	(128,297)	10,167
Effect of exchange rate changes on cash and cash equivalents	9,274	(22,031)	12,759
Net increase (decrease) in cash and cash equivalents	164	(100,195)	(11,282)
Cash and cash equivalents at beginning of period	104,146	204,341	215,623
Cash and cash equivalents at end of period	104,310	104,146	204,341
Supplemental disclosure of non-cash investing activities:
Deferred sale leaseback advance	18,285	69,680	60,194
Completion of deferred sale leaseback	(74,480)	(183,688)	0
Aircraft sold for future spare parts and maintenance	1,228	13,417	0
Aircraft purchases with short-term borrowings	$ 24,394	$ 0	$ 0