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Net Carrying Value of the Notes (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Debt Instrument [Line Items]    
Carrying amount of equity component (net of allocated debt issuance costs) $ 26,961 $ 26,961
Principal amount of Notes 67,625 67,625
Unamortized debt discount (5,110) (7,227)
Unamortized debt issuance costs (453) (640)
Net carrying amount $ 62,062 $ 59,758