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Expected Remaining Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jul. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2018 $ 128  
2019 520  
2020 406  
2021 287  
2022 191  
Thereafter 370  
Net Amount $ 1,902 $ 2,325