Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period 1

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Contractual term of share based payment award.

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- Definition

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 Indvidual In Fiscal Year

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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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- 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

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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

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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- Definition

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).

+ References

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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).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The total fair value of equity-based awards 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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- Definition

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

-Publisher FASB

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-Section 50

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ 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 (c)(1)(i)-(ii)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph b(1)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

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STOCK-BASED COMPENSATION (Narrative) (Details) (USD $)	12 Months Ended
STOCK-BASED COMPENSATION (Narrative) (Details) (USD $)	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 12,018,000	$ 10,981,000	$ 10,131,000
Discontinued operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense			1,200,000
2003 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Expiration Term	10 years
Number of shares reserved under plan (shares)	11,900,000
Percent of estimated fair market value at the date of grant (percentage)	100.00%
Options to purchase shares of common stock (shares)	2,828,087
Unvested restricted stock (shares)	815,440
Shares available for future grant (shares)	2,608,941
2003 Stock Plan \| Incentive Stock Option Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Expiration Term	7 years
Percent of estimated fair market value at the date of grant (percentage)	100.00%
2003 Stock Plan \| Stock Options granted to 10% Stockholder
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Expiration Term	5 years
Percent of estimated fair market value at the date of grant (percentage)	110.00%
1993 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Expiration Term	10 years
Number of shares reserved under plan (shares)	22,927,726
Options to purchase shares of common stock (shares)	475,788
2002 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved under plan (shares)	317,810
Percentage of fair market value at date of grant (percentage)	85.00%
Restricted stock granted	182,209	170,376	281,598
Stock Based Compensation Arrangement By Share Based Payment Award Offering Period	6 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock (shares)	815,000	688,000
Weighted average grant date fair value	$ 36.37	$ 33.54	$ 24.62
Restricted stock granted	391,000
Total unrecognized compensation cost	16,900,000
Period for recognition for unrecognized compensation cost	2.5
Total grant date fair value	5,500,000	3,100,000	3,100,000
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
Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Of Award To Any Indvidual In Fiscal Year	2,000,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares of common stock (shares)	3,304,000	5,360,000
Total unrecognized compensation cost	8,700,000
Period for recognition for unrecognized compensation cost	1.9
Total intrinsic value	27,600,000	26,200,000	9,000,000
Total cash received from employees as a result of exercises	38,200,000
Restricted Stock Units (RSUs) [Member] \| 2003 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio for grants of restricted stock, numerator (shares)	2.5
Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Of Award To Any Indvidual In Fiscal Year	$ 2,000,000
Minimum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	3 years
Maximum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	4 years
Options Granted Subsequent to September 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	3 years
Options granted from September 2004 to September 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period (years)	4 years