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Marketable Securities And Fair Value Disclosures (Tables) | 12 Months Ended
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Mar. 31, 2012
Marketable Securities And Fair Value Disclosures [Abstract] |
Summary Of Marketable Securities |
|  |  |  | Gross |  | Gross | Fair Market
|  | Cost at |  | Unrealized |  | Unrealized | Value at
|  | March 31, 2012 |  | Gains |  | Losses | March 31, 2012
Short-term commercial paper | $ | 5,276 | $ | 28 | $ | — | 5,304
|  |  |  | Gross |  | Gross |  |  | Fair Market
|  | Cost at |  | Unrealized |  | Unrealized |  |  | Value at
|  | March 31, 2011 |  | Gains |  | Losses |  |  | March 31, 2011
Short-term government-backed securities | $ | 76,368 | $ | 21 | $ | (18 | ) | $ | 76,371
Short-term commercial paper |  | 39,728 |  | 45 |  | (18 | ) |  | 39,755
Assets And Liabilities Carried At Fair Value |
|  | Total |  | Quoted Prices in |  | Using Significant Other |  | Using Significant
|  | Carrying |  | Active Markets |  | Observable Inputs |  | Unobservable Inputs
|  | Value |  | (Level 1) |  | (Level 2) |  | (Level 3)
March 31, 2012: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Cash equivalents | $ | 23,485 | $ | 23,485 | $ | — | $ | —
Short-term commercial paper |  | 5,304 |  | — |  | 5,304 |  | —
|  | Total |  | Quoted Prices in |  | Using Significant Other |  | Using Significant
|  | Carrying |  | Active Markets |  | Observable Inputs |  | Unobservable Inputs
|  | Value |  | (Level 1) |  | (Level 2) |  | (Level 3)
March 31, 2011: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Cash equivalents | $ | 49,837 | $ | 49,837 | $ | — | $ | —
Short-term government-backed securities |  | 76,371 |  | — |  | 76,371 |  | —
Short-term commercial paper |  | 39,755 |  | — |  | 39,755 |  | —
Derivatives |  | 3,087 |  | — |  | 3,087 |  | —

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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