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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2014
Jul. 31, 2013
Jan. 31, 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 9,023 34,029 19,025
Money Market [Member] | Level 1 [Member]
     
Cash equivalents measured at fair value 9,023 34,029 19,025
Commercial Paper [Member]
     
Cash equivalents measured at fair value 630 630 10,626
Commercial Paper [Member] | Level 2 [Member]
     
Cash equivalents measured at fair value 630 630 10,626
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