EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended																12 Months Ended																12 Months Ended																																																																	12 Months Ended														12 Months Ended
	Mar. 31, 2015 USD ($) Objectives Employee	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2015 Employee Stock Option [Member] USD ($)	Mar. 31, 2014 Employee Stock Option [Member] USD ($)	Mar. 31, 2013 Employee Stock Option [Member] USD ($)	Mar. 31, 2015 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2014 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2013 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2015 Performance Cash [Member] USD ($)	Mar. 31, 2014 Performance Cash [Member] USD ($)	Mar. 31, 2013 Performance Cash [Member] USD ($)	Mar. 31, 2015 Performance Cash [Member] Maximum [Member]	Mar. 31, 2015 Performance Cash [Member] Minimum [Member]	Mar. 31, 2015 Plan 2007 [Member]	May 14, 2013 Plan 2007 [Member]	Mar. 31, 2015 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2014 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2013 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2015 Plan 2004 [Member] Employee Stock Option [Member]	Mar. 31, 2015 Plan 2003 [Member] Non-employee directors [Member]	Mar. 31, 2015 Plan 2003 [Member] Employee Stock Option [Member] Non-employee directors [Member]	Mar. 31, 2015 Original Terms [Member]	Mar. 31, 2015 First Amendment [Member]	Mar. 31, 2015 Share-based Compensation Award, Tranche One [Member] Employee Stock Option [Member]	Mar. 31, 2015 Share-based Compensation Award, Tranche Two [Member] Employee Stock Option [Member]	Mar. 31, 2015 Share-based Compensation Award, Tranche Three [Member] Employee Stock Option [Member]	Mar. 31, 2015 Retirement Agreement [Member] Chief Executive Officer [Member] USD ($)	Mar. 31, 2015 Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Equity Securities [Member]	Mar. 31, 2014 Equity Securities [Member]	Mar. 31, 2015 Debt Securities [Member]	Mar. 31, 2014 Debt Securities [Member]	Mar. 31, 2015 Real Estate [Member]	Mar. 31, 2014 Real Estate [Member]	Mar. 31, 2015 Other Plan Assets [Member]	Mar. 31, 2014 Other Plan Assets [Member]	Mar. 31, 2015 Cash and cash equivalents [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] USD ($)	Mar. 31, 2015 Cash and cash equivalents [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Cash and cash equivalents [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Cash and cash equivalents [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 UK Pension Plan [Member]	Mar. 31, 2015 UK Pension Plan [Member] Plans	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] USD ($) Plans	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] GBP (£)	Mar. 31, 2014 Pension Plan [Member] UK Pension Plan [Member]	Mar. 31, 2013 Pension Plan [Member] UK Pension Plan [Member]	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] Pilot [Member]	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] Other employee [Member]	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member]	Mar. 31, 2014 Pension Plan [Member] Norway pension plan [Member]	Mar. 31, 2013 Pension Plan [Member] Norway pension plan [Member]	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member] Pilot [Member] Age	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member] Other employee [Member] Age	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member] Minimum [Member] Age	Mar. 31, 2016 Scenario, Forecast [Member] USD ($)	Mar. 31, 2016 Scenario, Forecast [Member] Pension Plan [Member] UK Pension Plan [Member] USD ($)	Mar. 31, 2016 Scenario, Forecast [Member] Pension Plan [Member] Norway pension plan [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($)
Compensation Related Costs [Line Items]
Defined Contribution Pension Match	3.00%
Defined Contribution Pension	3.00%
Defined Contribution Amount	$ 15,200,000	$ 12,700,000	$ 10,900,000
Annual Rate Increase Limit																																																																																																		5.00%
Number of original closed defined benefit pension plans																																																																																																				2	2
Closed Plan Maximum Contribution																																																																																																								7.35%	7.00%
Minimum Contribution Match																																																																																																				5.00%	5.00%
Number Of Other Defined Contribution Plans																																																																																																			3
Number Of Other Defined Contribution Plans Closed To New Members																																																																																																			2
Retirement Age																																																																																																													58	62
Years of Service For Maximum Pension																																																																																																															30
Change in Benefit Obligation
Projected benefit obligation (PBO)- beginning balance	637,641,000	606,313,000
Service cost for benefits earned during the period	7,878,000	7,886,000	8,209,000
Interest cost on PBO	26,000,000	26,861,000	25,683,000
Actuarial loss	86,940,000	(29,313,000)
Benefit payments and expenses	(28,191,000)	(23,234,000)
Effect of exchange rate changes	(90,969,000)	49,128,000
Projected benefit obligation (PBO)- ending balance	639,299,000	637,641,000	606,313,000
Change in Plan Assets
Market value of assets - beginning balance	550,818,000	479,666,000																											13,657,000	48,685,000	470,139,000	440,835,000	61,298,000									13,657,000	48,685,000	13,657,000	48,685,000	0	0	0	0	104,953,000	118,712,000	0	0	104,953,000	118,712,000	0	0	98,867,000	96,537,000	0	0	98,867,000	96,537,000	0	0	101,242,000	105,207,000	0	0	101,242,000	105,207,000	0	0	71,998,000	51,853,000	0	0	71,998,000	51,853,000	0	0	93,079,000	68,526,000	0	0	93,079,000	68,526,000	0	0	55,927,000	61,298,000	0	0	0	0	55,927,000	61,298,000
Actual return on assets	57,691,000	23,630,000																															1,084,000
Employer Contributions	34,633,000	28,974,000																																																																																																		18,600,000	12,500,000
Benefit payments and expenses	(28,191,000)	(23,234,000)
Effect of exchange rate changes on plan assets	(75,228,000)	41,782,000																															17,796,000
Market value of assets - ending balance	539,723,000	550,818,000	479,666,000																										13,657,000	48,685,000	470,139,000	440,835,000	55,927,000									13,657,000	48,685,000	13,657,000	48,685,000	0	0	0	0	104,953,000	118,712,000	0	0	104,953,000	118,712,000	0	0	98,867,000	96,537,000	0	0	98,867,000	96,537,000	0	0	101,242,000	105,207,000	0	0	101,242,000	105,207,000	0	0	71,998,000	51,853,000	0	0	71,998,000	51,853,000	0	0	93,079,000	68,526,000	0	0	93,079,000	68,526,000	0	0	55,927,000	61,298,000	0	0	0	0	55,927,000	61,298,000
Accumulated benefit obligation (ABO)	615,136,000	611,782,000
Projected benefit obligation (PBO)	639,299,000	637,641,000	606,313,000
Net recognized pension liability	99,576,000	86,823,000
Amounts recognized in accumulated other comprehensive loss	252,920,000	232,848,000
Components of net periodic pension cost
Service cost for benefits earned during the period	7,878,000	7,886,000	8,209,000
Interest cost on PBO	26,000,000	26,861,000	25,683,000
Expected return on assets	(31,020,000)	(29,282,000)	(29,068,000)
Amortization of unrecognized losses	6,653,000	7,705,000	6,612,000
Net periodic pension cost	9,511,000	13,170,000	11,436,000
Amount in Accumulated OCI expected to be recognized in following fiscal year	7,100,000
Assumptions Used [Abstract]
Discount rate																																																																																																				4.40%	4.40%	4.40%	4.90%			4.25%	4.00%	3.50%
Rate of compensation increase																																																																																																										4.00%	4.25%	4.25%
Social security increase amount																																																																																																										3.75%	4.00%	4.00%
Expected return on plan assets																																																																																																				6.29%	6.29%	6.29%	6.90%			2.75%	3.25%	4.50%
Pension increase rate																																																																																																				3.10%	3.10%	3.30%	3.00%			1.75%	1.25%	0.75%
Pension Plan Investment Strategy, Number Of Objectives	3
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual allocation of plan assets	100.00%	100.00%																																57.10%	59.10%	35.80%	27.60%	1.60%	1.50%	5.50%	11.80%
Target allocation of plan assets	100.00%	100.00%																																58.30%	57.80%	31.10%	30.80%	0.00%	0.00%	10.60%	11.40%
Estimated cash contributions																																																																																																																	18,100,000	11,700,000
Net purchases, sales and settlements																																	11,341,000
Projected benefit payments by year [Abstract]
2016	25,417,000
2017	26,222,000
2018	26,736,000
2019	27,548,000
2020	28,214,000
Aggregate 2021 - 2024	151,155,000
Share-based Compensation [Abstract]
Common Stock Shares reserved	4,133,008														5,400,000	2,400,000					250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,377,643
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures																					5,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	10 years			10 years		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage																									33.00%	33.00%	33.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				3 years			3 years			3 years												6 months
Cash Based Performance Compensation Arrangement By Cash Based Payment Award Percentage Of Target Amount													200.00%	0.00%
Performance Cash Max Payout										15,900,000	13,200,000	8,800,000
Performance Cash Compensation Expense										14,100,000	8,700,000	10,200,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Retirement Terms, Years Of Service																							5 years
Share-Based Compensation Arrangement By Share-Based Payment Award, Retirement Terms, Retirement Age																							62 years
Share-Based Compensation Arrangement By Share-Based Payment Award, Retirement Terms, Years Of Service and Retirement Age																								80 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding, Weighted Average Exercise Price, Beginning balance	$ 48.62
Options, Grants in Period, Weighted Average Exercise Price	$ 74.44																$ 74.37	$ 62.66	$ 43.38
Options, Exercises in Period, Weighted Average Exercise Price	$ 45.31	$ 35.51
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 61.76
Options, Outstanding, Weighted Average Price, Ending balance	$ 57.80	$ 48.62
Options, Exercisable, Weighted Average Exercise Price	$ 46.68
Options, Outstanding, Number, Beginning Balance	1,002,156
Options, Grants in Period, Gross	472,744
Options, Exercises in Period	114,145	433,608
Options, Forfeitures and Expirations in Period	24,619
Options, Outstanding, Number, Ending Balance	1,336,136	1,002,156
Options, Exercisable, Number	673,784
Options, Exercisable, Weighted Average Remaining Contractual Term	7 years 3 months 26 days
Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 10 months 15 days
Options, Outstanding, Intrinsic Value	6,410,000
Options, Exercisable, Intrinsic Value	7,118,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair Value Assumptions, Risk Free Interest Rate				1.67%	1.01%	0.80%
Fair Value Assumptions, Expected Term				5 years	5 years	5 years
Fair Value Assumptions, Expected Volatility Rate				30.10%	48.70%	50.20%
Fair Value Assumptions, Expected Dividend Rate				2.06%	1.60%	1.83%
Weighted Average Grant Date Fair Value				$ 17.17	$ 23.77	$ 16.73
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				8,200,000			12,200,000
Share-based Compensation, Nonvested Awards, Number Of Shares				662,352			419,229
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 8 months 4 days			1 year 9 months 6 days
Share-based Compensation Vested Awards Fair Value				8,900,000	5,100,000	3,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				2,400,000	15,500,000	6,300,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options				5,200,000	15,400,000	15,300,000
Tax benefit attributable to options exercised	1,600,000	5,700,000	500,000	600,000	5,400,000	1,900,000
Stock-based compensation expense	16,353,000	15,433,000	11,869,000				10,100,000	9,400,000	7,400,000
Reduction From A Full Value Share Granted, Number Of Shares															2
Reduction From An Option And Stock Appreciation Right Granted, Number Of Shares															1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted Stock, Nonvested, Number, Beginning Balance	459,717
Restricted Stock, Grants in Period	172,808
Restricted Stock, Vested in Period	207,561
Restricted Stock, Forfeited in Period	5,735
Restricted Stock, Nonvested, Number, Ending Balance	419,229	459,717
Restricted Stock, Weighted Average Grant Date Fair Value, Beginning Balance	$ 52.13
Restricted Stock, Grants in Period, Weighted Average Grant Date Fair Value	$ 74.18
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value	$ 48.76
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value	$ 57.98
Restricted Stock, Weighted Average Grant Date Fair Value, Ending Balance	$ 62.81	$ 52.13
Rabbi Trust investments																																																																																																																			2,379,000	6,599,000	2,379,000	6,599,000	0	0	0	0
Cash Bonus	19,900,000	17,200,000	12,200,000
One Time Bonus			3,300,000
Contributions to deferred compensation plan	1,500,000	900,000	700,000
Compensation																												5,500,000
Voluntary Separation Program, Number Of Employees Offered	2,888
Voluntary Separation Program, Number Of Employees Acceptance	137
Voluntary Separation Program, Total Estimated Cost	7,200,000
Voluntary Separation Program, Total Estimated Cost Recognized																																																																																																																$ 6,800,000