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Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Jul. 31, 2018 | Jul. 31, 2017
Cumulative effect for adoption of revenue standard (Notes 2 & 3) | $ (7,517) |  |  |
Increase (Decrease) in Restricted Cash for Operating Activities |  | $ 12,800 |  |
Restricted cash | 20,762 | $ 23,566 | $ 6,895 | $ 10,300
Retained Earnings [Member] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | (8,053) |  |  |
Cumulative effect for adoption of revenue standard (Notes 2 & 3) | (7,517) |  |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Cumulative effect for adoption of revenue standard (Notes 2 & 3) | $ 8,053 |  |  |

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