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Stock-based Payment Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 12, 2020 | Oct. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2020
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Number of stock options exercised |  | 771,000 |  |
Stock Based Compensation (Textual) |  |  |  |
Shares available for calculating intrinsic value (in shares) |  | 7,433,309 |  |
Deferred compensation arrangement with individual - requisite service period |  | 5 years |  |
Total stock-based compensation |  | $ 8,913 | $ 5,533 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 106.30 |  |  |
Stock price increase threshold [Member] |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 125 |  |  |
Number of days threshold [Member] |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 20 |  |  |
Award Date [Domain] |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Nonqualified stock options to purchase of shares, exercise price | $ 85.04 |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | 25,500 |  |
Award Date [Domain] | Valuation Technique, Option Pricing Model [Member] |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value | $ 25.47 |  |  |
Award Date [Domain] | Chief Executive Officer [Member] |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Nonqualified stock options to purchase of shares |  |  |  | 1,000,000
Total stock-based compensation |  | $ 4,300 |  |
Employee Stock Option | Valuation Technique, Option Pricing Model [Member] |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |  | Monte Carlo simulation model |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum |  | 0.71% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  | 25.20% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  | 0.00% |  |
Employee Stock Option | Valuation Technique, Option Pricing Model [Member] | Minimum |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  | 7 years 7 months 20 days |  |
Restricted Stock [Member] | Minimum |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Award vesting period |  | 2 years |  |
Restricted Stock [Member] | Maximum |  |  |  |
Stock Based Compensation (Textual) |  |  |  |
Award vesting period |  | 5 years |  |

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- Definition Stock based Compensation + References No definition available. + Details
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- Definition The per share price that the individual must pay to acquire shares under the deferred compensation arrangement. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 54 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2603-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 44 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2062-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1828-109256 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2600-109256 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2597-109256 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2538-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2538-109256 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1757-109256 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2574-109256 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition Description of method used to estimate fair value of award under share-based payment arrangement. + 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 (f)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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