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Related Party Transactions (Tables)
 12 Months Ended
Jul. 31, 2015
Related Party Transactions [Abstract]  
Summary of changes in estimated liability to straight Path included in other current liabilities

       
Year ended July 31      
(in thousands) 2015  2014 
Balance at beginning of year $1,860  $931 
Additional liability  1,793   1,930 
Adjustments  (556)  — 
Payments  (2,811)  (1,001)
Balance at end of year $286  $1,860