Stock-Based Employee Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2013 M
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of options granted (in years)	7
Vesting period under original 2004 Plan (in years)	4
One fourth of the shares vest from date of grant (in years)	1
Minimum vesting period of non-performance based full value awards (in years)	3
Minimum vesting period of performance based full value awards (in years)	1
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance under the amended plan (in shares)	9,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 15.2
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	4.0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 1 month 20 days
Original number of shares of reserved for issuance (in shares)	28,500,000
Shares reserved for issuance under the amended plan (in shares)	36,800,000
Increase available after amendment (in shares)	8,300,000
Original plan dilution factor to be equivalent to the amended plan (in shares)	1.74
Months Remaining for shares to vest after first year of grant(in months)	36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 14.0
Shares available for future grant as of balance sheet date (in millions of shares)	11,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	11,900,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,700,000
Vesting period of restricted stock units from grant date (in years)	3
Percent of restricted stock vesting each one-year anniversary	33.33%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	744,000
Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Exercise price of fair market value of the options on the date the option is granted (in hundredths)	100.00%
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent that full value awards that result in the issuance of an aggregate of common stock available may be granted to any one or more participants without respect to such minimum vesting provisions. (in hundredths)	5.00%

Increase in shares available after July 21, 2010 amendment.

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- Definition

Options granted by the Company under the 2004 Plan generally expire seven years from the date of grant

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The exercise price of the options granted by the Company under the 2004 Plan shall not be less than 100% of the fair market value for a common share subject to such option on the date the option is granted

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Full value awards made under the 2004 Plan shall become vested over a period of not less than three years (or, if vesting is performance-based, over a period of not less than one year) following the date such award is made; provided, however, that full value awards that result in the issuance of an aggregate of up to 5% of common stock available under the 2004 Plan may be granted to any one or more participants without respect to such minimum vesting provisions.

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Minimum vesting period performance based full value awards made under the 2004 Plan (in years)

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Months Remaining for shares to vest after first year of grant(in months)

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Options granted by the Company under the 2004 Plan generally expire seven years from the date of grant and generally vest over a four-year period from the date of grant, with one-quarter of the shares of common stock vesting on the one-year anniversary of the grant date

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors) 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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Original Plan Dilution Factor to be Equivalent to the Amended Plan

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Annual Award Vesting Percentage

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- Definition

Shares available for future grant as of balance sheet date under the 2004 plan

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Vesting period of restricted stock units from grant date (in years)

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Vesting period under original 2004 Plan

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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.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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

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

-Publisher FASB

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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).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

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

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