EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Mar. 31, 2015

Employee Benefit Plan [Abstract]

Schedule of Accumulated and Projected Benefit Obligations

The following tables provide a rollforward of the projected benefit obligation and the fair value of plan assets, set forth the defined benefit retirement plans’ funded status and provide detail of the components of net periodic pension cost calculated for the U.K. and Norway pension plans. The measurement date adopted is March 31. For the purposes of amortizing gains and losses, the 10% corridor approach has been adopted and assets are taken at fair market value. Any such gains or losses are amortized over the average remaining life expectancy of the plan members.

	Fiscal Year Ended March 31,
	2015			2014
	(In thousands)
Change in benefit obligation:
Projected benefit obligation (PBO) at beginning of period	$	637,641		$	606,313
Service cost	7,878			7,886
Interest cost	26,000			26,861
Actuarial loss	86,940			(29,313		)
Benefit payments and expenses	(28,191		)	(23,234		)
Effect of exchange rate changes	(90,969		)	49,128
Projected benefit obligation (PBO) at end of period	$	639,299		$	637,641

Schedule of Change in Plan Assets

Change in plan assets:
Market value of assets at beginning of period	$	550,818		$	479,666
Actual return on assets	57,691			23,630
Employer contributions	34,633			28,974
Benefit payments and expenses	(28,191		)	(23,234		)
Effect of exchange rate changes	(75,228		)	41,782
Market value of assets at end of period	$	539,723		$	550,818

Schedule of Net Funded Status

Reconciliation of funded status:
Accumulated benefit obligation (ABO)	$	615,136		$	611,782
Projected benefit obligation (PBO)	$	639,299		$	637,641
Fair value of assets	(539,723		)	(550,818		)
Net recognized pension liability	$	99,576		$	86,823
Amounts recognized in accumulated other comprehensive loss	$	252,920		$	232,848

Schedule of components of net periodic pension cost

	Fiscal Year Ended March 31,
	2015			2014			2013
	(In thousands)
Components of net periodic pension cost:
Service cost for benefits earned during the period	$	7,878		$	7,886		$	8,209
Interest cost on PBO	26,000			26,861			25,683
Expected return on assets	(31,020		)	(29,282		)	(29,068		)
Amortization of unrecognized losses	6,653			7,705			6,612
Net periodic pension cost	$	9,511		$	13,170		$	11,436

Schedule of Assumptions

Actuarial assumptions used to develop the components of the U.K. plans were as follows:

	Fiscal Year Ended March 31,
	2015		2014		2013
Discount rate	4.40	%	4.40	%	4.90	%
Expected long-term rate of return on assets	6.29	%	6.29	%	6.90	%
Pension increase rate	3.10	%	3.30	%	3.00	%

Actuarial assumptions used to develop the components of the Norway plan were as follows:

	Fiscal Year Ended March 31,
	2015		2014		2013
Discount rate	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	2.75	%	3.25	%	4.50	%
Pension increase rate	1.75	%	1.25	%	0.75	%

Schedule of Investment Strategy

The market value of the plan assets as of March 31, 2015 and 2014 was allocated between asset classes as follows. Details of target allocation percentages under the Trustee’s investment strategies as of the same dates are also included.

	Target Allocation as of March 31,				Actual Allocation as of March 31,
Asset Category	2015		2014		2015		2014
Equity securities	58.3	%	57.8	%	57.1	%	59.1	%
Debt securities	31.1	%	30.8	%	35.8	%	27.6	%
Property	—	%	—	%	1.6	%	1.5	%
Other assets	10.6	%	11.4	%	5.5	%	11.8	%
Total	100.0	%	100.0	%	100.0	%	100.0	%

Schedule of Fair Value Hierarchy

The following table summarizes, by level within the fair value hierarchy, the plan assets we had as of March 31, 2015, which are valued at fair value (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2015
Cash and cash equivalents	$	13,657	$	—	$	—	$	13,657
Equity investments - U.K.	—		104,953		—		104,953
Equity investments - Non-U.K.	—		98,867		—		98,867
Diversified growth (absolute return) funds	—		101,242		—		101,242
Government debt securities	—		71,998		—		71,998
Corporate debt securities	—		93,079		—		93,079
Insurance policies	—		—		55,927		55,927
Total investments	$	13,657	$	470,139	$	55,927	$	539,723

The following table summarizes, by level within the fair value hierarchy, the plan assets we had as of March 31, 2014, which are valued at fair value (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2014
Cash and cash equivalents	$	48,685	$	—	$	—	$	48,685
Equity investments - U.K.	—		118,712		—		118,712
Equity investments - Non-U.K.	—		96,537		—		96,537
Diversified growth (absolute return) funds	—		105,207		—		105,207
Government debt securities	—		51,853		—		51,853
Corporate debt securities	—		68,526		—		68,526
Insurance policies	—		—		61,298		61,298
Total investments	$	48,685	$	440,835	$	61,298	$	550,818

Rollforward of Level 3 Fair Value Changes

The following table summarizes the changes in the Level 3 plan assets for fiscal year 2015 (in thousands):

March 31, 2014	$	61,298
Actual return on assets	1,084
Net purchases, sales and settlements	11,341
Effect of exchange rate changes	(17,796		)
March 31, 2015	$	55,927

Future benefit payments

Estimated future benefit payments over each of the next five fiscal years from March 31, 2015 and in aggregate for the following five fiscal years after fiscal year 2020, including life assurance premiums, are as follows (in thousands):

Projected Benefit Payments by the Plans for Fiscal Years Ending March 31,	Payments
2016	$	25,417
2017	26,222
2018	26,736
2019	27,548
2020	28,214
Aggregate 2021 - 2024	151,155

Schedule of Stock Option Activity

A summary of our stock option activity for fiscal year 2015 is presented below:

	Weighted Average Exercise Prices		Number of Shares		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
						(in thousands)
Outstanding at March 31, 2014	$	48.62	1,002,156
Granted	74.44		472,744
Exercised	45.31		(114,145	)
Expired or forfeited	61.76		(24,619	)
Outstanding at March 31, 2015	57.80		1,336,136		7.32	$	6,410
Exercisable at March 31, 2015	46.68		673,784		5.87	$	7,118

Schedule of Black Scholes Assumptions [Table Text Block]

The following table shows the assumptions we used to compute the stock-based compensation expense for stock option grants issued during fiscal years 2015, 2014 and 2013.

	Fiscal Year Ended March 31,
	2015			2014			2013
Risk free interest rate	1.67		%	1.01		%	0.8		%
Expected life (years)	5			5			5
Volatility	30.1		%	48.7		%	50.2		%
Dividend yield	2.06		%	1.60		%	1.83		%
Weighted average grant-date fair value of options granted	$	17.17		$	23.77		$	16.73

Schedule of Non-Vested Restricted Stock and Restricted Stock Units

The following is a summary of non-vested restricted stock as of March 31, 2015 and 2014 and changes during fiscal year 2015:

	Units		Weighted Average Grant Date Fair Value per Unit
Non-vested as of March 31, 2014	459,717		$	52.13
Granted	172,808		74.18
Forfeited	(5,735	)	57.98
Vested	(207,561	)	48.76
Non-vested as of March 31, 2015	419,229		62.81