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Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Jul. 31, 2020
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Accounting Policies [Abstract] |  |
Contract with Customer, Refund Liability | $ 5,510 | $ 6,295

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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=123410239&loc=SL49130611-203046-203046 + Details
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