EMPLOYEE BENEFIT PLANS (Details)	0 Months Ended	12 Months Ended														12 Months Ended				12 Months Ended	0 Months Ended								12 Months Ended																																																																	12 Months Ended
	Feb. 03, 2014 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2014 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2013 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2012 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2011 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2013 Non Employee Grants [Member]	Mar. 31, 2012 Non Employee Grants [Member] USD ($)	Mar. 31, 2014 Employee Stock Option [Member] USD ($)	Mar. 31, 2013 Employee Stock Option [Member] USD ($)	Mar. 31, 2012 Employee Stock Option [Member] USD ($)	Mar. 31, 2014 Plan 2007 [Member]	Mar. 31, 2013 Plan 2007 [Member]	Mar. 31, 2014 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2013 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2012 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2014 Plan 2003 [Member]	Mar. 31, 2014 Chief Executive Officer [Member] Retirement Agreement [Member] USD ($)	Feb. 03, 2014 Senior Vice President, Operations [Member]	Feb. 03, 2014 Senior Vice President, Commercial [Member]	Feb. 03, 2014 Senior Vice President, Administration [Member]	Feb. 03, 2014 Senior Vice President, General Counsel [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Securities [Member]	Mar. 31, 2013 Equity Securities [Member]	Mar. 31, 2014 Debt Securities [Member]	Mar. 31, 2013 Debt Securities [Member]	Mar. 31, 2014 Real Estate [Member]	Mar. 31, 2013 Real Estate [Member]	Mar. 31, 2014 Other Plan Assets [Member]	Mar. 31, 2013 Other Plan Assets [Member]	Mar. 31, 2014 Cash and cash equivalents [Member] USD ($)	Mar. 31, 2013 Cash and cash equivalents [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Cash and cash equivalents [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Cash and cash equivalents [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Cash and cash equivalents [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] USD ($)	Mar. 31, 2013 Equity Investments UK [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Equity Investments UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Equity Investments UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Equity Investments UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] USD ($)	Mar. 31, 2013 Equity Investments Non UK [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Equity Investments Non UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Equity Investments Non UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Equity Investments Non UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] USD ($)	Mar. 31, 2013 Diviersified Growth Funds [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] USD ($)	Mar. 31, 2013 Government debt securities [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Government debt securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Government debt securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Government debt securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] USD ($)	Mar. 31, 2013 Corporate Debt Securities [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Corporate Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Corporate Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] USD ($)	Mar. 31, 2013 Group Insurance Policies [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2013 Group Insurance Policies [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2013 Group Insurance Policies [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2013 Group Insurance Policies [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 UK Pension Plan [Member] USD ($)	Mar. 31, 2014 UK Pension Plan [Member] GBP (£)	Mar. 31, 2013 UK Pension Plan [Member]	Mar. 31, 2012 UK Pension Plan [Member]	Mar. 31, 2014 UK Pension Plan [Member] Pilot [Member]	Mar. 31, 2014 UK Pension Plan [Member] Other Employee [Member]	Mar. 31, 2014 Norway pension plan [Member] USD ($)	Mar. 31, 2013 Norway pension plan [Member]	Mar. 31, 2012 Norway pension plan [Member]	Mar. 31, 2014 Norway pension plan [Member] Pilot [Member]	Mar. 31, 2014 Norway pension plan [Member] Other Employee [Member]	Mar. 31, 2014 Norway pension plan [Member] Minimum [Member]
Compensation Related Costs [Line Items]
Defined Contribution Pension Match		3.00%
Defined Contribution Pension		3.00%
Defined Contribution Amount		$ 12,700,000	$ 10,900,000	$ 10,700,000
Annual Rate Increase Limit		5.00%
Closed Plan Maximum Contribution																																																																																																		7.35%	7.00%
Minimum Contribution Match																																																																																														5.00%	5.00%
Retirement Age																																																																																																							58	62
Years of Service For Maximum Pension																																																																																																									30
Change in Benefit Obligation
Projected benefit obligation (PBO)- beginning balance		606,313,000	561,633,000
Service cost		7,886,000	8,209,000	6,332,000
Interest cost		26,861,000	25,683,000	28,208,000
Actuarial loss		(29,313,000)	63,393,000
Benefit payments and expenses		(23,234,000)	(23,652,000)
Effect of exchange rate changes		(49,128,000)	28,953,000
Projected benefit obligation (PBO)- ending balance		637,641,000	606,313,000	561,633,000
Change in Plan Assets
Market value of assets - beginning balance		479,666,000	449,891,000																						48,685,000	1,973,000	440,835,000	428,104,000	49,589,000									48,685,000	1,973,000	48,685,000	1,973,000	0	0	0	0	118,712,000	119,626,000	0	0	118,712,000	119,626,000	0	0	96,537,000	89,720,000	0	0	96,537,000	89,720,000	0	0	105,207,000	94,426,000	0	0	105,207,000	94,426,000	0	0	51,853,000	61,028,000	0	0	51,853,000	61,028,000	0	0	68,526,000	63,304,000	0	0	68,526,000	63,304,000	0	0	61,298,000	49,589,000	0	0	0	0	61,298,000	49,589,000
Actual return on assets		23,630,000	47,974,000																										7,514,000
Employer Contributions		28,974,000	28,607,000																																																																																											20,800,000	12,500,000
Effect of exchange rate changes on plan assets		(41,782,000)	23,154,000																										(1,284,000)
Accrued pension liabilities		86,823,000	126,647,000
Accumulated benefit obligation (ABO)		611,782,000	582,047,000
Amounts recognized in accumulated other comprehensive loss		232,848,000	244,322,000
Market value of assets - ending balance		550,818,000	479,666,000	449,891,000																					48,685,000	1,973,000	440,835,000	428,104,000	61,298,000									48,685,000	1,973,000	48,685,000	1,973,000	0	0	0	0	118,712,000	119,626,000	0	0	118,712,000	119,626,000	0	0	96,537,000	89,720,000	0	0	96,537,000	89,720,000	0	0	105,207,000	94,426,000	0	0	105,207,000	94,426,000	0	0	51,853,000	61,028,000	0	0	51,853,000	61,028,000	0	0	68,526,000	63,304,000	0	0	68,526,000	63,304,000	0	0	61,298,000	49,589,000	0	0	0	0	61,298,000	49,589,000
Components of net periodic pension cost
Expected return on assets		(29,282,000)	(29,068,000)	(29,639,000)
Amortization of unrecognized losses		7,705,000	6,612,000	5,386,000
Net periodic pension cost		13,170,000	11,436,000	10,287,000
Amount in Accumulated OCI expected to be recognized in following fiscal year		4,800,000
Assumptions Used [Abstract]
Discount rate																																																																																														4.40%	4.40%	4.90%	5.60%			4.00%	3.50%	4.75%
Expected long-term rate of return on assets																																																																																														6.29%	6.29%	6.90%	7.20%			3.25%	4.50%	4.75%
Rate of compensation increase																																																																																														3.30%	3.30%	3.00%	3.50%			1.25%	0.75%	1.75%
Salary escalation rate																																																																																																				4.25%	4.25%	4.50%
Social Security base rate																																																																																																				4.00%	4.00%	4.25%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual allocation of plan assets		100.00%	100.00%																											59.10%	64.60%	27.60%	31.00%	1.50%	1.80%	11.80%	2.60%
Target allocation of plan assets		100.00%	100.00%																											57.80%	58.30%	30.80%	31.10%	0.00%	0.00%	11.40%	10.60%
Estimated cash contributions																																																																																														21,200,000						7,900,000
Net purchases, sales and settlements																													5,479,000
Projected benefit payments by year [Abstract]
2015		27,229,000
2016		28,464,000
2017		29,381,000
2018		30,305,000
2019		31,230,000
Aggregate 2020 - 2024		167,674,000
Rabbi Trust investments		6,599,000
Incentive Compensation [Line Items]
Common Stock Shares reserved		4,454,714												5,400,000	2,400,000
Shares available for grant		2,992,841																	250,000
Performance Cash Maximum Potential Payout		14,000,000	9,300,000	8,000,000
Performance Cash Compensation Expense		8,700,000	10,200,000	4,100,000
Additional compensation expense										100,000
Stock based compensation expense		15,433,000	11,869,000	11,510,000		9,400,000	7,400,000	7,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Outstanding		1,002,156	1,150,519
Stock option grants- shares		302,678							5,000
Exercise of stock options		(433,608)	(416,936)
Stock options expired or forfeited- shares		(17,433)
Stock options exercisable- shares		471,431
Weighted average exercise price of options oustanding		$ 48.62	$ 40.03
Weighted average exercise price of options granted		$ 62.66														$ 62.66	$ 43.38	$ 43.79
Weighted average exercise price of options exercised		$ 35.51	$ 36.67
Weighted average exercise price of options expired or forfeited		$ 51.49
Weighted average exercise price of options exercisable		$ 43.22
Weighted average remaining contractual life of options outstanding		6 years 11 months 13 days
Weighted average remaining contractual life of options exercisable		5 years 1 month 17 days
Aggregate intrinsic value options outstanding		15,228,000
Aggregate intrinsic value options exercisable		26,956,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk free interest rate											1.01%	0.75%	1.50%
Expected life (years)											5 years	5 years	6 years
Volatility											48.70%	50.20%	47.10%
Dividend yield											1.60%	1.83%	1.37%
Weighted average grant-date fair value of options granted											$ 23.77	$ 16.73	$ 17.32
Unrecognized stock-based compensation expense					10,000,000						5,000,000
Weighted average period to recognize unrecognized stock-based compensation expense					2 years						1 year 8 months 13 days
Unvested stock options - shares					459,717						530,725
Fair value option vested											5,100,000	3,900,000	3,100,000
Intrinsic value options exercised											15,500,000	6,300,000	2,200,000
Cash received from options exercised											15,400,000	15,300,000	5,300,000
Tax benefit attributable to options exercised		5,700,000	500,000	400,000							5,400,000	1,900,000	500,000
Tax benefit related to stock-based compensation		5,723,000	500,000	354,000
Restricted stock and restricted stock units [rollforward]
Non-vested restricted stock and restricted stock units		459,717	500,029
Restricted stock grants- shares		232,364																			12,784	14,330	13,206	12,223
Restricted stock forfeited- shares		(34,554)
Restricted stock vested- shares		(238,122)
Non-vested weighted average grant date fair value per unit		$ 52.13	$ 38.63
Restricted stock grants- fair value	$ 71.18	$ 64.99
Restricted stock forfeited- fair value		$ 57.30
Restricted stock vested- fair value		$ 35.59
Bonus		17,200,000	12,200,000	9,700,000
One Time Bonus			3,300,000
Contributions to deferred compensation plan		900,000	700,000	600,000
Lump Sum Cash Payment																				3,800,000
Compensation																				1,900,000
Officer Compensation Expense		$ 2,900,000	$ 2,000,000	$ 2,300,000