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Stockholder's Equity (Details 2) - Stock Options - $ / shares | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Number Of Shares [Roll Forward] |  |  |
Non-vested shares at July 31, | 4,209,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 1,175,000 |  |
Vested (in shares) | (1,874,000) |  |
Forfeitures or expirations (in shares) | (207,000) |  |
Non-vested shares at July 31, | 3,303,000 | 4,209,000 |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Non-vested shares at July 31, fair value | $ 11.05 |  |
Grants of non-vested shares, fair value | 21.54 | $ 15.47 | $ 8.88
Vested, fair value | 9.98 |  |
Forfeitures or expirations, fair value | 7.82 |  |
Non-vested shares at July 31, fair value | 17.58 | $ 11.05 |
Valuation Technique, Option Pricing Model [Member] |  |  |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Grants of non-vested shares, fair value | $ 24.89 |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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