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Stockholders' Equity (Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended |  | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2013 Stock Options [Member] | Mar. 31, 2012 Stock Options [Member] | Mar. 31, 2011 Stock Options [Member] | Mar. 31, 2013 Restricted Stock And Stock Awards [Member] | Mar. 31, 2012 Restricted Stock And Stock Awards [Member] | Mar. 31, 2011 Restricted Stock And Stock Awards [Member] | Mar. 31, 2013 Performance-Based Restricted Stock [Member | Mar. 31, 2012 Performance-Based Restricted Stock [Member | May 31, 2011 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2013 2007 Stock Incentive Plan [Member] | Mar. 31, 2013 2007 Director Stock Option Plan [Member] | Mar. 31, 2013 Employee Stock Purchase Plan [Member] | Mar. 31, 2012 Employee Stock Purchase Plan [Member] | Mar. 31, 2011 Employee Stock Purchase Plan [Member] | Mar. 31, 2013 Maximum [Member] Stock Options [Member] | Mar. 31, 2013 Maximum [Member] Restricted Stock And Stock Awards [Member] | Mar. 31, 2013 Maximum [Member] U.S. Treasury Rates [Member] | Mar. 31, 2013 Minimum [Member] Stock Options [Member] | Mar. 31, 2013 Minimum [Member] Restricted Stock And Stock Awards [Member] | Mar. 31, 2013 Minimum [Member] U.S. Treasury Rates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures |  |  |  | $ 3,500,000 | $ 6,100,000 |  | $ 5,800,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years) |  |  |  | 1 year 8 months 12 days |  |  | 1 year 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value of stock option awards granted | $ 2.56 | $ 6.02 | $ 17.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of exercisable options | 0 |  | 8,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation plans expired terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  | 5 years
Total fair value of restricted stock granted |  |  |  |  |  |  | 10,600,000 | 5,600,000 | 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock granted for bonuses and severance |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock vested |  |  |  |  |  |  | 3,400,000 | 4,100,000 | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock granted for bonuses and severance |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted | 3,126,749 |  |  |  |  |  |  |  |  | 1,422,127 | 109,211 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 8,138,000 | 9,864,000 | 13,412,000 | 3,389,000 | 6,177,000 | 6,374,000 | 4,698,000 | 3,633,000 | 6,919,000 | 1,800,000 |  |  |  |  | 51,000 | 54,000 | 119,000 |  |  |  |  |  |
Number of shares cancelled | 646,493 |  |  |  |  |  |  |  |  |  |  | 37,375 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation plans expired terms | May 02, 2007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares awarded annually |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Contractual life of options, in years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  | 3 years | 2 years |
Number of shares granted by option upon election to the board |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance under the plan |  |  |  |  |  |  |  |  |  |  |  |  | 5,389,465 | 177,000 | 339,269 |  |  |  |  |  |  |  |
Percentage of purchase discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Compensation expense recognized | $ 100,000 | $ 100,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,935 |  |  |  |  |  |  |  |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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. + Details
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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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -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. + Details
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