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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Jul. 31, 2013 | Apr. 30, 2013
--- | --- | --- | ---
Contingent Consideration, Fair Value Disclosure | $ 9,100 | $ 9,100 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Contingent Consideration, Fair Value Disclosure | 9,100 | 9,100 |
Money Market [Member] |  |  |
Cash equivalents measured at fair value | 78,851 | 34,029 | 49,025
Money Market [Member] | Level 1 [Member] |  |  |
Cash equivalents measured at fair value | 78,851 | 34,029 | 49,025
Commercial Paper [Member] |  |  |
Cash equivalents measured at fair value | 630 | 630 | 630
Commercial Paper [Member] | Level 2 [Member] |  |  |
Cash equivalents measured at fair value | 630 | 630 | 630
Certificates of Deposit [Member] |  |  |
Cash equivalents measured at fair value | 630 | 630 | 630
Certificates of Deposit [Member] | Level 2 [Member] |  |  |
Cash equivalents measured at fair value | $ 630 | $ 630 | $ 630

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- Definition Fair Value of Contingent Consideration Liability + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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Balance Type: | debit
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