Contractual term of share based payment award.

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

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Shares Counted Against Shares Issuable For Each Share Issued Less Than Fair Market Value On Grant Date

+ References

No definition available.

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- Definition

Stock Based Compensation Arrangement By Share Based Payment Award Offering Period

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No definition available.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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- Definition

The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

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- Definition

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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- Definition

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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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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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- Definition

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.

+ References

No definition available.

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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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- Definition

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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- Definition

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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- Definition

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

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- Definition

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 ($)	12 Months Ended			24 Months Ended	145 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2013	Aug. 31, 2013
2003 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved under plan (shares)	1,490,000
Percent of estimated fair market value at the date of grant (percentage)	100.00%
Options to purchase shares of common stock (shares)	1,461,153
Unvested restricted stock and restricted stock units (shares)	1,153,788
Shares available for future grant (shares)	2,823,478
2002 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved under plan (shares)	282,326
Percentage of fair market value at date of grant (percentage)	85.00%
Shares issued under the ESPP	168,948	156,333	151,607
Total cash received from employees as a result of stock issuances under the ESPP, net of taxes	$ 5,900,000
Offering period	6 months
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares of common stock (shares)	1,461,000	1,558,000
Total intrinsic value	$ 6,900,000	$ 14,000,000	$ 16,300,000
Total cash received from employees as a result of exercises, net of taxes	9,500,000
Total net tax benefit attributable to stock options exercised	2,100,000
Total unrecognized compensation cost	$ 3,600,000
Period for recognition for unrecognized compensation cost	1 year 329 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock and restricted stock units (shares)	1,187,000	1,290,000
Total unrecognized compensation cost	$ 31,400,000
Period for recognition for unrecognized compensation cost	1 year 183 days
Weighted average grant date fair value (in dollars per share)	$ 54.66	$ 45.26	$ 46.02
Total grant date fair value	$ 24,200,000	$ 17,600,000	$ 12,800,000
Restricted Stock \| 2003 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio for grants of restricted stock, numerator (shares)	2.5
Initial value of restricted stock received (maximum)	$ 2,000,000
Restricted Stock Units (RSUs) \| 2003 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial value of restricted stock received (maximum)	$ 2,000,000
Maximum \| 2003 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (years)	7 years
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