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The employer contributions vest pro-ratably over this service period by the employees, after which all employer contributions will be fully vested.

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The estimated percentage number of equity-based payment instruments, excluding stock (or unit) options, forfeiture during the period.

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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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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The number of grants made 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 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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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Net number of share options (or share units) granted during the period.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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-Name Regulation S-X (SX)

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SHARE-BASED COMPENSATION (Details) (USD $)	12 Months Ended
SHARE-BASED COMPENSATION (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted to employees (in shares)	0	0
Options outstanding (in shares)	0	0	40,000
Options exercised (in shares)		(40,000)
Weighted Average Grant-date Fair Value [Rollforward]
Vested share-based awards withheld to satisfy income tax obligations (in shares)	35,158	42,073
Compensation Expense [Abstract]
Total share-based compensation expense	$ 4,600,000	$ 4,000,000	$ 3,300,000
Unrecognized compensation expense, period for recognition	27 months
401 (k) Profit Sharing Plan [Abstract]
Period over which employer contribution is vested	4 years
Contribution to profit sharing plan	1,400,000	1,100,000	1,100,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price (in dollars per share)			$ 12.73
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price (in dollars per share)			$ 15.25
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised	1,600,000
Compensation Expense [Abstract]
Unrecognized compensation expense	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeiture rate (in hundredths)	0.00%
Number of Shares [Rollforward]
Nonvested (in shares)	200,120
Granted (in shares)	88,771
Vested (in shares)	(112,377)
Nonvested (in shares)	176,514	200,120
Weighted Average Grant-date Fair Value [Rollforward]
Nonvested (in dollars per share)	$ 41.11
Granted (in dollars per share)	$ 57.18
Vested (in dollars per share)	$ 35.70
Nonvested (in dollars per share)	$ 52.75	$ 41.11
Vested share-based awards withheld to satisfy income tax obligations (in shares)	35,158	42,073
Vested share-based awards withheld to satisfy income tax obligations	2,000,000	2,500,000
Compensation Expense [Abstract]
Unrecognized compensation expense	$ 5,600,000
2008 Director LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	250,000
2008 Director LTIP [Member] \| Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)	116,363
2008 Employee LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,000,000
2008 Employee LTIP [Member] \| Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)	454,160
2012 Employee LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	750,000
2012 Employee LTIP [Member] \| Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)	155,280