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Fair Value Measurements (Details) - Schedule of assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance, beginning of period | $ 1,825 | $ 3,637 | $ 3,825 | $ 3,619
Purchase of Rafael Holdings, Inc. warrant | 354 |  | 354 |
Redemption for Visa mandatory release assessment |  |  | (1,870) |
Total gains recognized in “Other income, net” | 140 | 408 | 10 | 426
Balance, end of period | 2,319 | 4,045 | 2,319 | 4,045
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period |  |  |  |

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- Definition Amount of change in unrealized gains or losses included in earnings for assets held at end of period. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Redemption for Visa mandatory release assessment + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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