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Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable, gross, current | $ 356,597 | $ 372,207 |  |
Less: Allowance for doubtful accounts | (6,390) | (4,942) | $ (5,444) | $ (4,311)
Accounts receivable, net | 350,207 | 367,265 |  |
Advance charges receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable, gross, current | 260,196 | 280,835 |  |
Trade accounts receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable, gross, current | 94,281 | 89,274 |  |
Other receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable, gross, current | $ 2,120 | $ 2,098 |  |

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