EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Mar. 31, 2017

Defined Benefit Plan Disclosure [Line Items]

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,
	2017			2016
	(In thousands)
Change in benefit obligation:
Projected benefit obligation (PBO) at beginning of period	$	525,053		$	639,299
Service cost	627			8,243
Interest cost	15,330			20,108
Actuarial loss (gain)	73,622			(17,096		)
Benefit payments and expenses	(26,456		)	(29,836		)
Curtailments	—			(12,960		)
Settlements	—			(65,799		)
Effect of exchange rate changes	(70,990		)	(16,906		)
Projected benefit obligation (PBO) at end of period	$	517,186		$	525,053

Schedule of change in plan assets

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.

Change in plan assets:
Market value of assets at beginning of period	$	454,946		$	539,723
Actual return on assets	71,873			(6,271		)
Employer contributions	16,530			32,128
Benefit payments and expenses	(26,456		)	(29,836		)
Settlements	—			(65,799		)
Effect of exchange rate changes	(61,354		)	(14,999		)
Market value of assets at end of period	$	455,539		$	454,946

Schedule of net funded status

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.

Reconciliation of funded status:
Accumulated benefit obligation (ABO)	$	517,186		$	524,540
Projected benefit obligation (PBO)	$	517,186		$	525,053
Fair value of assets	(455,539		)	(454,946		)
Net recognized pension liability	$	61,647		$	70,107
Amounts recognized in accumulated other comprehensive loss	$	220,396		$	235,720

Schedule of components of net periodic pension cost

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,
	2017			2016			2015
	(In thousands)
Components of net periodic pension cost:
Service cost for benefits earned during the period	$	627		$	8,243		$	7,878
Interest cost on PBO	15,330			20,108			26,000
Expected return on assets	(21,697		)	(27,208		)	(31,020		)
Amortization of unrecognized losses	7,266			8,246			6,653
Net periodic pension cost	$	1,526		$	9,389		$	9,511

Schedule of assumptions

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

	Fiscal Year Ended March 31,
	2017		2016		2015
Discount rate	3.30	%	3.30	%	4.40	%
Expected long-term rate of return on assets	5.30	%	5.40	%	6.29	%
Pension increase rate	2.80	%	2.80	%	3.10	%

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

	Fiscal Year Ended March 31,
	2016		2015
Discount rate	2.50	%	4.25	%
Rate of compensation increase	3.50	%	4.00	%
Social Security increase amount	3.25	%	3.75	%
Expected return on plan assets	1.50	%	2.75	%
Pension increase rate	—	%	1.75	%

Schedule of investment strategy

The market value of the plan's assets as of March 31, 2017 and 2016 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	2017		2016		2017		2016
Equity securities	64.8	%	58.3	%	51.1	%	60.7	%
Debt securities	34.8	%	31.1	%	33.4	%	35.9	%
Property	—	%	—	%	—	%	0.1	%
Other assets	0.4	%	10.6	%	15.5	%	3.3	%
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, 2017, 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, 2017
Cash and cash equivalents	$	70,650	$	—	$	—	$	70,650
Equity investments - U.K.	—		47,392		—		47,392
Equity investments - Non-U.K.	—		185,567		—		185,567
Government debt securities	—		80,654		—		80,654
Corporate debt securities	—		71,276		—		71,276
Total investments	$	70,650	$	384,889	$	—	$	455,539

The following table summarizes, by level within the fair value hierarchy, the plan assets we had as of March 31, 2016, 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, 2016
Cash and cash equivalents	$	14,229	$	—	$	—	$	14,229
Equity investments - U.K.	—		61,085		—		61,085
Equity investments - Non-U.K.	—		117,140		—		117,140
Diversified growth (absolute return) funds	—		98,024		—		98,024
Government debt securities	—		72,728		—		72,728
Corporate debt securities	—		89,256		—		89,256
Insurance policies	—		—		2,484		2,484
Total investments	$	14,229	$	438,233	$	2,484	$	454,946

Future benefit payments

Estimated future benefit payments over each of the next five fiscal years from March 31, 2017 and in aggregate for the following five fiscal years after fiscal year 2022, including life assurance premiums, are as follows (in thousands):

Projected Benefit Payments by the Plans for Fiscal Years Ending March 31,	Payments
2018	$	19,882
2019	20,382
2020	20,883
2021	21,508
2022	22,008
Aggregate 2023 - 2027	117,417

Schedule of stock option activity

A summary of our stock option activity for fiscal year 2017 is presented below:

	Weighted Average Exercise Prices		Number of Shares		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
						(in thousands)
Outstanding at March 31, 2016	$	57.74	2,041,442
Granted	16.21		1,024,168
Expired or forfeited	57.79		(222,002	)
Outstanding at March 31, 2017	42.78		2,843,608		6.66	$	—
Exercisable at March 31, 2017	55.95		1,431,992		4.40	$	—

Schedule of Black Scholes assumptions

The following table shows the assumptions we used to compute the stock-based compensation expense for stock option grants issued during fiscal years 2017, 2016 and 2015.    

	Fiscal Year Ended March 31,
	2017			2016			2015
Risk free interest rate	1.07		%	1.62		%	1.67		%
Expected life (years)	5			5			5
Volatility	46.8		%	28.1		%	30.1		%
Dividend yield	2.74		%	3.14		%	2.06		%
Weighted average grant-date fair value of options granted	$	2.16		$	10.71		$	17.17

Schedule of non-vested restricted stock and restricted stock units

The following is a summary of non-vested restricted stock as of March 31, 2017 and 2016 and changes during fiscal year 2017:    

	Units		Weighted Average Grant Date Fair Value per Unit
Non-vested as of March 31, 2016	440,856		$	65.24
Granted	642,753		10.21
Forfeited	(45,535	)	59.78
Vested	(298,581	)	42.39
Non-vested as of March 31, 2017	739,493		26.97

Schedule of separation programs

The expense related to the VSPs and ISPs for the fiscal years 2017, 2016 and 2015 is as follows (in thousands):

	Fiscal Year Ended March 31,
	2017		2016		2015
VSP:
Direct cost	$	1,663	$	7,664	$	—
General and administrative	23		886		—
Total	$	1,686	$	8,550	$	—
ISP:
Direct cost	$	5,938	$	5,162	$	233
General and administrative	9,238		8,788		692
Total	$	15,176	$	13,950	$	925