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Equity Investment (Detail) - TH2 - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jul. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Losses from investment | $ 2,652 | $ 2,216 | $ 4,747 | $ 3,699 |
Loan to joint venture |  |  | 4,527 |  |
Loan to joint venture, outstanding balance | $ 6,684 |  | $ 6,684 |  | $ 2,157

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