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Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis - Fair Value Measurements, Recurring basis [Member] - USD ($) $ in Thousands | Jul. 31, 2020 | Jul. 31, 2019
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Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items] |  |
Debt securities | $ 18,363 | $ 2,534
Equity investments included in current assets | 5,964 | 5,688
Equity investments included in noncurrent assets | 3,825 | 3,619
TOTAL | 28,152 | 11,841
Contingent consideration included in other noncurrent liabilities (see Note 5) | (396) |
Level 1 [Member] |  |
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items] |  |
Debt securities | 2,498 |
Equity investments included in current assets | 5,964 | 5,688
Equity investments included in noncurrent assets |  |
TOTAL | 8,462 | 5,688
Contingent consideration included in other noncurrent liabilities (see Note 5) |  |
Level 2 [Member] |  |
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items] |  |
Debt securities | 15,865 | 2,534
Equity investments included in current assets |  |
Equity investments included in noncurrent assets |  |
TOTAL | 15,865 | 2,534
Contingent consideration included in other noncurrent liabilities (see Note 5) |  |
Level 3 [Member] |  |
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items] |  |
Debt securities |  |
Equity investments included in current assets |  |
Equity investments included in noncurrent assets | 3,825 | 3,619
TOTAL | 3,825 | $ 3,619
Contingent consideration included in other noncurrent liabilities (see Note 5) | $ (396) |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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