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Related Party Transactions (Tables)
 12 Months Ended
Jul. 31, 2018
Related Party Transactions [Abstract]  
Summary of changes in estimated liability to straight path included in other current liabilities
Year ended July 31      
(in thousands) 2018  2017 
Balance at beginning of year $81  $133 
Additional liability  

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   104 
Adjustments  (46)  (51)
Payments  (35)  (105)
Balance at end of year $

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  $81