TAXES (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Domestic	$ (14,357,000)	$ 2,472,000	$ (1,100,000)
Foreign	259,348,000	164,205,000	80,542,000
Income before provision for income taxes	244,991,000	166,677,000	79,442,000
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Current domestic provision for income taxes	36,872,000	1,638,000	27,000
Current foreign provision for income taxes	33,939,000	26,275,000	23,059,000
Current provision for income taxes total	70,811,000	27,913,000	23,086,000
Deferred domestic provision for income taxes	(6,646,000)	1,619,000	1,658,000
Deferred foreign provision for income taxes	(6,953,000)	5,470,000	(10,543,000)
Deferred Income Tax Expense (Benefit), Total	(13,599,000)	7,089,000	(8,885,000)
Income Tax Expense (Benefit)	57,212,000	35,002,000	14,201,000
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Net foreign taxes on non-U.S. earnings	11.80%	14.40%	20.40%
Change in Valuation Allowance	1.80%	0.00%	0.00%
Foreign earnings indefinitely reinvested abroad	(18.90%)	(28.40%)	(26.30%)
Foreign earnings that are currently taxed in the U.S.	4.10%	4.60%	5.90%
Effect of reduction in U.K. corporate income tax rate	(1.20%)	(1.70%)	(2.30%)
Dividend inclusion	1.10%	0.00%	16.60%
Benefit of prior year foreign tax credits	0.00%	0.00%	(5.30%)
Benefit of current year foreign tax credits	(5.20%)	(5.50%)	(9.80%)
Tax reserve release	(0.70%)	0.00%	(7.70%)
Other, net	(4.40%)	2.60%	(8.60%)
Effective Tax Rate Total	23.40%	21.00%	17.90%
Components of Deferred Tax Assets and Liabilities [Line Items]
Deferred tax assets - foreign tax credits	17,628,000	10,483,000
Deferred Tax Assets, Net operating loss	15,627,000	0
Deferred tax assets - accrued pension liability	18,531,000	29,951,000
Deferred tax assets - maintenance and repair	12,674,000	10,291,000
Deferred tax assets - equity compensation	11,627,000	11,607,000
Deferred tax assets - deferred revenues	2,124,000	2,212,000
Deferred tax assets - employee award programs	6,289,000	4,237,000
Deferred tax assets - employee payroll accruals	4,845,000	4,494,000
Deferred tax assets - other	3,188,000	6,348,000
Deferred Tax Assets, Valuation Allowance	(6,896,000)	0
Total deferred tax assets	85,637,000	79,623,000
Deferred Tax Liabilities- property and equipment	(205,104,000)	(189,482,000)
Deferred Tax Liabilities- inventories	(6,956,000)	(11,068,000)
Deferred Tax Liabilities- investments in unconsolidated affiliates	(8,985,000)	(11,681,000)
Deferred tax liabilities - employee programs	(1,895,000)	0
Deferred Tax Liabilities- other	(9,195,000)	(6,912,000)
Total deferred tax liabilities	(232,135,000)	(219,143,000)
Net deferred tax liabilities	(146,498,000)	(139,520,000)
Dividend inclusion as a result of internal realignment			13,200,000
Foreign Tax Credits			11,500,000
Decrease in Tax Reserve Foreign Ruling			12,600,000
UK Corporate Tax Rate Benefit	2,900,000	2,900,000	1,800,000
Number of aircraft involved in intercompany leasing transaction	11
Remaining Useful Life of an intercompany leasing transaction	13 years
Tax Benefit from intercompany leasing transaction	2,900,000	2,900,000	2,900,000
Unrecognized Tax Benefits Period Increase Decrease	(1,500,000)	100,000	(10,400,000)
Interest and Penalties	100,000	100,000	200,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits- beginning balance	1,710,000	1,523,000
Increase in Tax Reserve	129,000	348,000
Decrease in Tax Reserve	(1,434,000)	(161,000)
Decrease Resulting from Settlements with Taxing Authorities	(218,000)	0
Unrecognized Tax Benefits- ending balance	187,000	1,710,000	1,523,000
Unremitted foreign earnings reinvested abroad	679,300,000	553,800,000
Tax benefit attributable to options exercised	5,700,000	500,000	400,000
Income Taxes Paid	59,100,000	24,100,000	19,000,000
UNITED STATES
Components of Deferred Tax Assets and Liabilities [Line Items]
Open tax years by jurisdiction	2012
U.K.
Components of Deferred Tax Assets and Liabilities [Line Items]
Open tax years by jurisdiction	2012
NIGERIA
Components of Deferred Tax Assets and Liabilities [Line Items]
Open tax years by jurisdiction	2005
TRINIDAD
Components of Deferred Tax Assets and Liabilities [Line Items]
Open tax years by jurisdiction	2005
Year 2021 [Member]
Components of Deferred Tax Assets and Liabilities [Line Items]
Deferred tax assets - foreign tax credits	6,600,000
Year 2022 [Member]
Components of Deferred Tax Assets and Liabilities [Line Items]
Deferred tax assets - foreign tax credits	3,900,000
Year 2023 [Member]
Components of Deferred Tax Assets and Liabilities [Line Items]
Deferred tax assets - foreign tax credits	200,000
Year 2024 [Member]
Components of Deferred Tax Assets and Liabilities [Line Items]
Deferred tax assets - foreign tax credits	$ 6,900,000