| **Consolidated Statements Of Stockholders' Equity (USD $)In Millions, except Share data in Thousands, unless otherwise specified** | Total   | Common Stock [Member] | Paid-In Capital [Member] | Retained Earnings (Accumulated Deficit) [Member] | Accumulated Other Comprehensive Income [Member] | Repurchase Program, Total [Member] |
|------------------------------------------------------------------------------------------------------------------------------------|---------|-----------------------|--------------------------|--------------------------------------------------|-------------------------------------------------|------------------------------------|
| Balance at Mar. 31, 2011                                                                                                           | $ 2,564 | $ 3                   | $ 2,495                  | $ (153)                                          | $ 219                                           |                               |
| Balance (in shares) at Mar. 31, 2011                                                                                               |    | 332,564               |                     |                                             |                                            |                               |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                     |    |                  |                     |                                             |                                            |                               |
| Total comprehensive income (loss)                                                                                                  | 30      |                  |                     | 76                                               | (46)                                            |                               |
| Issuance of common stock                                                                                                           | 12      |                  | 12                       |                                             |                                            |                               |
| Issuance of common stock (in shares)                                                                                               |    | 7,850                 |                     |                                             |                                            |                               |
| Equity issued in connection with acquisition                                                                                       | 87      |                  | 87                       |                                             |                                            |                               |
| Equity issued in connection with acquisition (in shares)                                                                           |    | 4,356                 |                     |                                             |                                            |                               |
| Equity value of convertible note issuance, net                                                                                     | 105     |                  | 105                      |                                             |                                            |                               |
| Purchase of convertible note hedge                                                                                                 | (107)   |                  | (107)                    |                                             |                                            |                               |
| Sale of common stock warrants                                                                                                      | 65      |                  | 65                       |                                             |                                            |                               |
| Repurchase and retirement of common stock                                                                                          | (471)   |                  | (471)                    |                                             |                                            | (471)                              |
| Stock repurchased and retired during period, Shares                                                                                |    | (24,547)              |                     |                                             |                                            | 25,000                             |
| Stock-based compensation                                                                                                           | 170     |                  | 170                      |                                             |                                            |                               |
| Tax benefit (costs) from exercise of stock options                                                                                 | 3       |                  | 3                        |                                             |                                            |                               |
| Balance at Mar. 31, 2012                                                                                                           | 2,458   | 3                     | 2,359                    | (77)                                             | 173                                             |                               |
| Balance (in shares) at Mar. 31, 2012                                                                                               |    | 320,223               |                     |                                             |                                            |                               |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                     |    |                  |                     |                                             |                                            |                               |
| Total comprehensive income (loss)                                                                                                  | (6)     |                  |                     | 98                                               | (104)                                           |                               |
| Issuance of common stock                                                                                                           | 1       |                  | 1                        |                                             |                                            |                               |
| Issuance of common stock (in shares)                                                                                               |    | 7,801                 |                     |                                             |                                            |                               |
| Repurchase and retirement of common stock                                                                                          |    |                  | (349)                    |                                             |                                            | 349                                |
| Stock repurchased and retired during period, Shares                                                                                |    | (25,860)              |                     |                                             |                                            | 26,000                             |
| Stock-based compensation                                                                                                           | 164     |                  | 164                      |                                             |                                            |                               |
| Tax benefit (costs) from exercise of stock options                                                                                 | (1)     |                  | (1)                      |                                             |                                            |                               |
| Balance at Mar. 31, 2013                                                                                                           | 2,267   | 3                     | 2,174                    | 21                                               | 69                                              |                               |
| Balance (in shares) at Mar. 31, 2013                                                                                               | 302,000 | 302,164               |                     |                                             |                                            |                               |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                     |    |                  |                     |                                             |                                            |                               |
| Total comprehensive income (loss)                                                                                                  | (24)    |                  |                     | 8                                                | (32)                                            |                               |
| Issuance of common stock                                                                                                           | 16      |                  | 16                       |                                             |                                            |                               |
| Issuance of common stock (in shares)                                                                                               |    | 9,278                 |                     |                                             |                                            |                               |
| Stock-based compensation                                                                                                           | 150     |                  | 150                      |                                             |                                            |                               |
| Tax benefit (costs) from exercise of stock options                                                                                 | 13      |                  | 13                       |                                             |                                            |                               |
| Balance at Mar. 31, 2014                                                                                                           | $ 2,422 | $ 3                   | $ 2,353                  | $ 29                                             | $ 37                                            |                               |
| Balance (in shares) at Mar. 31, 2014                                                                                               | 311,000 | 311,442               |                     |                                             |                                            |                               |

| X                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity value of convertible note issuance, net.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sale of common stock warrants.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt with a beneficial conversion feature.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of stock issued during the period pursuant to acquisitions.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of new stock issued during the period.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued pursuant to acquisitions during the period.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased and retired during the period.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
+ References
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