Share Based Compensation Arrangement By Share Based Payment Award Market Price Offering Date

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Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Of Award To Any Individual In Fiscal Year

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Share Based Compensation Arrangement By Share Based Payment Award Minimum Percent Of Fair Value Options Can Be Granted At

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- Definition

Stock Based Compensation Arrangement By Share Based Payment Award Offering Period

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement, excluding stock option exercises.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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STOCK PLANS AND STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			24 Months Ended	145 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Apr. 30, 2013	Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved under plan (shares)	15,900,000
Percent of estimated fair market value at the date of grant (percentage)	100.00%
Options to purchase shares of common stock (shares)	922,975
Shares available for future grant (shares)	2,297,174
2002 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved under plan (shares)	274,323
Percentage of fair market value at date of grant (percentage)	85.00%
Shares issued under the ESPP	156,355	151,648	168,948
Total cash received from employees as a result of stock issuances under the ESPP, net of taxes	$ 5.7
Offering period	6 months
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of option	7 years
Options to purchase shares of common stock (shares)	923,000	1,417,000
Total intrinsic value	$ 9.4	$ 5.5	$ 6.9
Total cash received from employees as a result of exercises, net of taxes	18.2
Total net tax benefit attributable to stock options exercised	3.3
Total unrecognized compensation cost	$ 1.6
Period for recognition for unrecognized compensation cost	1 year 110 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial value of restricted stock and restricted stock units received (maximum)	$ 2.0
Unvested restricted stock and restricted stock units (shares)	1,253,561	1,172,000
Total unrecognized compensation cost	$ 36.7
Period for recognition for unrecognized compensation cost	1 year 219 days
Weighted average grant date fair value (in dollars per share)	$ 53.62	$ 44.82	$ 54.66
Total grant date fair value	$ 27.8	$ 28.9	$ 24.2
Employee \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	3 years
Employee \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	3 years			4 years
Director \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	4 years
Director \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	1 year				4 years