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Summary of Significant Accounting Policies Accounts Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Jul. 31, 2019 | Jul. 31, 2018
Receivables [Abstract] |  |
Accounts Receivable, Allowance for Credit Loss, Current | $ 5,005 | $ 4,471
Entity-Wide Revenue, Major Customer, Percentage | 10.00% |
Percentage Of Maximum Customers Shares In Companys Consolidated Accounts Receivable | 10.00% |

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- Definition Percentage of maximum customers shares in company's consolidated accounts receivable. + References No definition available. + Details
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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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