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Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | 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 | 6,700 |  |  |
Restricted cash | 12,005 | $ 16,609 | $ 6,895 | $ 10,300
Issuance of shares under share award plans, net of shares withheld for employee taxes | 11,364 | $ 69,480 |  |
Retained Earnings [Member] |  |  |  |
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) | $ 7,517 |  |  |

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