SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CF (Details) (USD $)	3 Months Ended	9 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			$ 162,410,000	$ 137,299,000
Capital expenditures	(197,166,000)	(186,489,000)	(499,285,000)	(526,048,000)
Proceeds from asset dispositions	6,717,000	89,264,000	404,361,000	244,867,000
Proceeds from sale of unconsolidated affiliate			4,185,000	112,210,000
Net cash used in investing activities			(90,739,000)	(168,971,000)
Proceeds from borrowings			347,860,000us-gaap_ProceedsFromIssuanceOfDebt	283,977,000us-gaap_ProceedsFromIssuanceOfDebt
Debt issuance costs			0us-gaap_PaymentsOfDebtIssuanceCosts	(15,152,000)us-gaap_PaymentsOfDebtIssuanceCosts
Repayment of debt			(373,169,000)us-gaap_RepaymentsOfLongTermDebt	(232,063,000)us-gaap_RepaymentsOfLongTermDebt
Dividends paid			(33,935,000)us-gaap_PaymentsOfDividends	(27,318,000)us-gaap_PaymentsOfDividends
Increases (decreases) in cash related to intercompany advances and debt			0	0
Partial prepayment of put/call obligation			(46,000)	(42,000)
Acquisition of noncontrolling interest			(3,170,000)us-gaap_PaymentsToMinorityShareholders	(2,078,000)us-gaap_PaymentsToMinorityShareholders
Proceeds from assignment of aircraft purchase agreements			0	106,113,000
Repurchase of Common Stock	(37,400,000)		(80,831,000)	(16,544,000)
Issuance of Common Stock			2,217,000	14,368,000
Tax benefit related to stock-based compensation			1,642,000	5,328,000
Net cash provided by (used in) financing activities			(139,432,000)	116,589,000
Effect of exchange rate changes on cash and cash equivalents			(15,214,000)	22,690,000
Net increase (decrease) in cash and cash equivalents			(82,975,000)	107,607,000
Cash and cash equivalents at beginning of period			204,341,000	215,623,000
Cash and cash equivalents at end of period	121,366,000	323,230,000	121,366,000	323,230,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(88,788,000)	(71,505,000)
Capital expenditures			(38,303,000)	(20,579,000)
Proceeds from asset dispositions			0	0
Proceeds from sale of unconsolidated affiliate			0	0
Net cash used in investing activities			(38,303,000)	(20,579,000)
Proceeds from borrowings			346,500,000	281,100,000
Debt issuance costs				(15,152,000)
Repayment of debt			(363,872,000)	(229,059,000)
Dividends paid			(33,935,000)	(24,252,000)
Increases (decreases) in cash related to intercompany advances and debt			255,878,000	58,519,000
Partial prepayment of put/call obligation			(46,000)	(42,000)
Acquisition of noncontrolling interest			0	0
Proceeds from assignment of aircraft purchase agreements				0
Repurchase of Common Stock			(80,831,000)	(16,544,000)
Issuance of Common Stock			2,217,000	14,368,000
Tax benefit related to stock-based compensation			1,642,000	5,328,000
Net cash provided by (used in) financing activities			127,553,000	74,266,000
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			462,000	(17,818,000)
Cash and cash equivalents at beginning of period			4,640,000	31,853,000
Cash and cash equivalents at end of period	5,102,000	14,035,000	5,102,000	14,035,000
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			263,933,000	95,359,000
Capital expenditures			(303,951,000)	(411,557,000)
Proceeds from asset dispositions			209,523,000	211,655,000
Proceeds from sale of unconsolidated affiliate			0	0
Net cash used in investing activities			(94,428,000)	(199,902,000)
Proceeds from borrowings			0	0
Debt issuance costs				0
Repayment of debt			0	0
Dividends paid			0	34,000
Increases (decreases) in cash related to intercompany advances and debt			(169,111,000)	3,188,000
Partial prepayment of put/call obligation			0	0
Acquisition of noncontrolling interest			0	0
Proceeds from assignment of aircraft purchase agreements				106,113,000
Repurchase of Common Stock			0	0
Issuance of Common Stock			0	0
Tax benefit related to stock-based compensation			0	0
Net cash provided by (used in) financing activities			(169,111,000)	109,335,000
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and cash equivalents			394,000	4,792,000
Cash and cash equivalents at beginning of period			0	5,370,000
Cash and cash equivalents at end of period	394,000	10,162,000	394,000	10,162,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			(13,181,000)	113,445,000
Capital expenditures			(157,031,000)	(199,775,000)
Proceeds from asset dispositions			194,838,000	139,075,000
Proceeds from sale of unconsolidated affiliate			4,185,000	112,210,000
Net cash used in investing activities			41,992,000	51,510,000
Proceeds from borrowings			1,360,000	2,877,000
Debt issuance costs				0
Repayment of debt			(9,297,000)	(3,004,000)
Dividends paid			0	(3,100,000)
Increases (decreases) in cash related to intercompany advances and debt			(86,767,000)	(61,707,000)
Partial prepayment of put/call obligation			0	0
Acquisition of noncontrolling interest			(3,170,000)	(2,078,000)
Proceeds from assignment of aircraft purchase agreements				0
Repurchase of Common Stock			0	0
Issuance of Common Stock			0	0
Tax benefit related to stock-based compensation			0	0
Net cash provided by (used in) financing activities			(97,874,000)	(67,012,000)
Effect of exchange rate changes on cash and cash equivalents			(15,214,000)	22,690,000
Net increase (decrease) in cash and cash equivalents			(84,277,000)	120,633,000
Cash and cash equivalents at beginning of period			200,147,000	178,400,000
Cash and cash equivalents at end of period	115,870,000	299,033,000	115,870,000	299,033,000
Consolidations, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			446,000	0
Capital expenditures			0	105,863,000
Proceeds from asset dispositions			0	(105,863,000)
Proceeds from sale of unconsolidated affiliate			0	0
Net cash used in investing activities			0	0
Proceeds from borrowings			0	0
Debt issuance costs				0
Repayment of debt			0	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
Acquisition of noncontrolling interest			0	0
Proceeds from assignment of aircraft purchase agreements				0
Repurchase of Common Stock			0	0
Issuance of Common Stock			0	0
Tax benefit related to stock-based compensation			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			446,000	0
Cash and cash equivalents at beginning of period			(446,000)	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0	$ 0

Increases (decreases) in cash related to intercompany advances and debt.

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The net cash outflow for early payment of guaranteed return element of noncontrolling interests put/call agreement.

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Amount received for progress payments we had previously made on aircraft that we assigned future payments due on these construction agreements to the purchaser.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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