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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jul. 31, 2017
Debt Instrument [Line Items]    
Bank Term Loan under Credit Agreement   $ 19,375
Total debt $ 2,544 22,166
Less: financing fees   (840)
Less: current portion (359) (3,779)
Total long-term debt 2,185 17,547
Total debt 2,544 22,166
Bank Term Loan-Commerzbank    
Debt Instrument [Line Items]    
Bank Term Loan under Credit Agreement $ 2,544 $ 2,791