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Operating Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Operating Lease Commitments [Abstract]      
Gross rental expense $ 3,500 $ 3,500 $ 3,900
Future minimum rental commitments [Abstract]      
2017 2,565    
2018 2,289    
2019 1,813    
2020 1,278    
2021 1,134    
Thereafter $ 886