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Fair Value Measurements (Tables) | 6 Months Ended
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Jan. 31, 2012
Fair Value Measurements [Abstract] |
Summary Of Cash Equivalents Measured At Fair Value |
|  | Fair Value Measurement as of January 31, 2012 |
Description |  | Balance at January 31, 2012 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Money Market |  | $ | 8,386 |  |  | $ | 8,386 |  |  | $ | — |  |  | $ | — |
Commercial Paper |  | $ | 19,990 |  |  | $ | — |  |  | $ | 19,990 |  |  | $ | — |
Certificates of Deposit |  | $ | 1,890 |  |  | $ | — |  |  | $ | 1,890 |  |  | $ | — |
|  | Fair Value Measurement as of July 31, 2011 |
Description |  | Balance at July 31, 2011 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
US Treasury |  | $ | 8,381 |  |  | $ | 8,381 |  |  | $ | — |  |  | $ | — |
Certificates of Deposit |  | $ | 2,490 |  |  | $ | — |  |  | $ | 2,490 |  |  | $ | — |
|  | Fair Value Measurement as of January 31, 2011 |
Description |  | Balance at January 31, 2011 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
US Treasury |  | $ | 8,297 |  |  | $ | 8,297 |  |  | $ | — |  |  | $ | — |
Money Market |  | $ | 402 |  |  | $ | 402 |  |  | $ | — |  |  | $ | — |
Certificates of Deposit |  | $ | 300 |  |  | $ | — |  |  | $ | 300 |  |  | $ | — |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets and liabilities that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 820 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -SubTopic 10 -Topic 820 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258 + Details
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