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Equity Investment (Detail) - TH2 - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Losses from investment | $ 2,095 | $ 1,483 |
Loan to joint venture | 1,534 |  |
Loan to joint venture, outstanding balance | $ 3,691 |  | $ 2,157

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