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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jul. 31, 2020 | Aug. 01, 2019 | Jul. 31, 2019
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Accounting Standards Update and Change in Accounting Principle [Abstract] |  |  |
Operating lease assets | $ 41,899 | $ 55,984 | $ 0
Operating Lease, Liability | $ 47,286 | $ 58,544 |

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