EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Accumulated and Projected Benefit Obligations

	Fiscal Year Ended March 31,
	2014			2013
	(In thousands)
Change in benefit obligation:
Projected benefit obligation (PBO) at beginning of period	$	606,313		$	561,633
Service cost	7,886			8,209
Interest cost	26,861			25,683
Actuarial loss	(29,313		)	63,393
Benefit payments and expenses	(23,234		)	(23,652		)
Effect of exchange rate changes	49,128			(28,953		)
Projected benefit obligation (PBO) at end of period	$	637,641		$	606,313

Schedule of Change in Plan Assets

Change in plan assets:
Market value of assets at beginning of period	$	479,666		$	449,891
Actual return on assets	23,630			47,974
Employer contributions	28,974			28,607
Benefit payments and expenses	(23,234		)	(23,652		)
Effect of exchange rate changes	41,782			(23,154		)
Market value of assets at end of period	$	550,818		$	479,666

Schedule of Net Funded Status

Reconciliation of funded status:
Accumulated benefit obligation (ABO)	$	611,782		$	582,047
Projected benefit obligation (PBO)	$	637,641		$	606,313
Fair value of assets	(550,818		)	(479,666		)
Net recognized pension liability	$	86,823		$	126,647
Amounts recognized in accumulated other comprehensive loss	$	232,848		$	244,322

Schedule of components of net periodic pension cost

	Fiscal Year Ended March 31,
	2014			2013			2012
	(In thousands)
Components of net periodic pension cost:
Service cost for benefits earned during the period	$	7,886		$	8,209		$	6,332
Interest cost on PBO	26,861			25,683			28,208
Expected return on assets	(29,282		)	(29,068		)	(29,639		)
Amortization of unrecognized losses	7,705			6,612			5,386
Net periodic pension cost	$	13,170		$	11,436		$	10,287

Schedule of Assumptions

	Fiscal Year Ended March 31,
	2014		2013		2012
Discount rate	4.40	%	4.90	%	5.60	%
Expected long-term rate of return on assets	6.29	%	6.90	%	7.20	%
Pension increase rate	3.30	%	3.00	%	3.50	%

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

	Fiscal Year Ended March 31,
	2014		2013		2012
Discount rate	4.00	%	3.50	%	4.75	%
Rate of compensation increase	4.25	%	4.25	%	4.50	%
Social Security increase amount	4.00	%	4.00	%	4.25	%
Expected return on plan assets	3.25	%	4.50	%	4.75	%
Pension increase rate	1.25	%	0.75	%	1.75	%

Schedule of Investment Strategy

	Target Allocation as of March 31,				Actual Allocation as of March 31,
Asset Category	2014		2013		2014		2013
Equity securities	57.8	%	58.3	%	59.1	%	64.6	%
Debt securities	30.8	%	31.1	%	27.6	%	31.0	%
Property	—	%	—	%	1.5	%	1.8	%
Other assets	11.4	%	10.6	%	11.8	%	2.6	%
Total	100.0	%	100.0	%	100.0	%	100.0	%

Schedule of Fair Value Hierarchy

	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

	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, 2013
Cash and cash equivalents	$	1,973	$	—	$	—	$	1,973
Equity investments - U.K.	—		119,626		—		119,626
Equity investments - Non-U.K.	—		89,720		—		89,720
Diversified growth (absolute return) funds	—		94,426		—		94,426
Government debt securities	—		61,028		—		61,028
Corporate debt securities	—		63,304		—		63,304
Insurance policies	—		—		49,589		49,589
Total investments	$	1,973	$	428,104	$	49,589	$	479,666

Rollforward of Level 3 Fair Value Changes

March 31, 2013	$	49,589
Actual return on assets	7,514
Net purchases, sales and settlements	5,479
Effect of exchange rate changes	(1,284		)
March 31, 2014	$	61,298

Future benefit payments

Projected Benefit Payments by the Plans for Fiscal Years Ending March 31,	Payments
2015	$	27,229
2016	28,464
2017	29,381
2018	30,305
2019	31,230
Aggregate 2020 - 2024	167,674

Schedule of Stock Option Activity

	Weighted Average Exercise Prices		Number of Shares		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
						(in thousands)
Outstanding at March 31, 2013	$	40.03	1,150,519
Granted	62.66		302,678
Exercised	35.51		(433,608	)
Expired or forfeited	51.49		(17,433	)
Outstanding at March 31, 2014	48.62		1,002,156		6.95	$	15,228
Exercisable at March 31, 2014	43.22		471,431		5.13	$	26,956

Schedule of Black Scholes Assumptions [Table Text Block]

	Fiscal Year Ended March 31,
	2014			2013			2012
Risk free interest rate	1.01		%	0.75		%	1.5		%
Expected life (years)	5			5			6
Volatility	48.7		%	50.2		%	47.1		%
Dividend yield	1.60		%	1.83		%	1.37		%
Weighted average grant-date fair value of options granted	$	23.77		$	16.73		$	17.32

Schedule of Non-Vested Restricted Stock and Restricted Stock Units

	Units		Weighted Average Grant Date Fair Value per Unit
Non-vested as of March 31, 2013	500,029		$	38.63
Granted	232,364		64.99
Forfeited	(34,554	)	57.30
Vested	(238,122	)	35.59
Non-vested as of March 31, 2014	459,717		52.13