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Cash, Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Jul. 31, 2011
Cash and Cash Equivalents [Abstract] |
Cash, Cash Equivalents as of July 31, 2011 and July 31, 2010 |
|  |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses Less Than 12 Months |  | Unrealized Losses 12 Months or Longer |  | Estimated Fair Value
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Cash |  |  |  | $ | 42,664 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 42,664 |
Money market funds |  |  |  |  | 31,345 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 31,345 |
Total |  |  |  | $ | 74,009 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 74,009 |
As of July 31, 2010, cash and cash equivalents include the following (in thousands):
|  |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses Less Than 12 Months |  | Unrealized Losses 12 Months or Longer |  | Estimated Fair Value
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Cash |  |  |  | $ | 131,070 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 131,070 |
Money market funds |  |  |  |  | 107,118 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 107,118 |
Cash equivalents—US Treasury Bills |  |  |  |  | 30,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 30,000 |
Total |  |  |  | $ | 268,188 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 268,188 |

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