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CAPITAL STOCK (Tables)

12 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Cost

Compensation cost related to stock-based transactions is recognized in the consolidated financial statements based on fair value. The total amount of stock-based compensation expense, which is recorded on a straight line basis, was as follows:

(In thousands)	2018			2017			2016
Selling, general and administrative expenses	$9,960			$6,894			$5,183
Research and development	2,114			1,549			1,060
Cost of goods sold	951			707			706
	$13,025			$9,150			$6,949

Schedule of Summary of Stock Option Activity

A summary of stock option activity for the fiscal year ended March 31, 2018 is as follows:

	Options Outstanding (shares)			Weighted Average Exercise Price per Share				Weighted Average Remaining Life (years)		Aggregate Intrinsic Value ($000’s)
Outstanding at April 1, 2017	2,038,795			$	35.51			3.88		$	10,963
Granted	368,507			41.96
Exercised	(1,027,727	)		36.64
Forfeited/Canceled	(182,137	)		34.51
Outstanding at March 31, 2018	1,197,438			$	36.68			4.71		$	43,685
Exercisable at March 31, 2018	429,084			$	36.24			2.92		$	15,843
Vested or expected to vest at March 31, 2018	1,066,789			$	36.55			4.57		$	39,051

Schedule of Assumptions Utilized for Estimating Fair Value of Option Grants

The assumptions utilized for option grants during the periods presented are as follows:

	2018				2017				2016
Volatility	24.2		%		24.0		%		22.8		%
Expected life (years)	4.8				4.9				4.9
Risk-free interest rate	1.7		%		1.2		%		1.4		%
Dividend yield	0.0		%		0.0		%		0.0		%
Fair value per option	$	10.25			$	7.61			$	7.40

Schedule of Assumptions Used, Other than Options

The weighted average rates used to determine the net periodic benefit costs and projected benefit obligations were as follows:

	2018			2017			2016
Discount rate	1.07	%		0.76	%		0.72	%
Rate of increased salary levels	1.73	%		1.43	%		1.58	%
Expected long-term rate of return on assets	0.90	%		1.10	%		1.20	%

The fair values of shares purchased under the Employee Stock Purchase Plan are estimated using the Black-Scholes single option-pricing model with the following weighted average assumptions:

	2018			2017			2016
Volatility	22.6	%		31.3	%		21.1	%
Expected life (months)	6			6			6
Risk-free interest rate	1.2	%		0.5	%		0.2	%
Dividend Yield	0.0	%		0.0	%		0.0	%

The weighted-average grant-date fair value of RSUs granted and total fair value of RSUs vested were as follows:

	2018				2017				2016
Grant-date fair value per RSU	$	41.87			$	32.61			$	33.19
Fair value of RSUs vested	$	33.03			$	34.98			$	36.07

The assumptions used in the Monte Carlo model for PSUs granted during each year were as follows:

	2018			2017			2016
Expected stock price volatility	26.11	%		26.39	%		22.27	%
Peer group stock price volatility	34.13	%		33.86	%		31.95	%
Correlation of returns	49.51	%		51.17	%		26.27	%

Schedule of Summary of Restricted Stock Units Activity

A summary of RSU activity for the fiscal year ended March 31, 2018 is as follows:

	Shares			Weighted Average Grant Date Fair Value
Unvested at April 1, 2017	341,641			$	33.16
Granted	269,905			41.87
Vested	(133,906	)		33.03
Forfeited	(59,926	)		34.58
Unvested at March 31, 2018	417,714			$	38.95

Schedule of Performance Share Unit awards

A summary of PSU activity for the fiscal year ended March 31, 2018 is as follows:

	Shares			Weighted Average Grant Date Fair Value
Unvested at April 1, 2017	284,625			$	33.66
Granted	179,616			46.49
Vested	(13,212	)		35.09
Forfeited	(62,922	)		33.16
Unvested at March 31, 2018	388,107			$	39.63

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Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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