| **Fair Value Measurements (Tables)**               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Fair Value Disclosures [Abstract]**              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Summary Of Cash Equivalents Measured At Fair Value | The table below summarizes the Company’s cash equivalents measured at fair value (all other assets and liabilities measured at fair value are immaterial) (in thousands):  Fair Value Measurement as of July 31, 2012DescriptionBalance at July 31, 2012Level 1Level 2Level 3Money Market$6,581$6,581$—$—Commercial Paper$2,441$—$2,441$—Certificates of Deposit$1,260$—$1,260$— Fair Value Measurement as of July 31, 2011DescriptionBalance at July 31, 2011Level 1Level 2Level 3US Treasury$8,381$8,381$—$—Certificates of Deposit$2,490$—$2,490$— |

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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, liabilities, and financial instruments classified in shareholders' equity 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 -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258
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