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Stockholder's Equity (Details Textuals 3) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 12, 2020 | Oct. 31, 2013 | Dec. 31, 2007 | Jan. 31, 2015 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period Cost Per Share |  |  |  |  |  | $ 47.81 |
Deferred compensation arrangement with individual - requisite service period |  |  |  |  | 5 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 106.30 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |  |  |  |  | The fair value of each option, without a market-based condition was estimated on the measurement date using the Black-Scholes Merton (“BSM”) option-pricing model. For options that included a market-based condition the Monte Carlo simulation model was used. The Black-Scholes Merton option-pricing model utilized the following assumptions:July 31,202020192018Expected life (in years)5.4—5.75.3—6.65.3—6.9Risk-free interest rate0.29 %—1.67 %1.80 %—2.69 %1.88 %—2.62 %Estimated volatility21.7%—27.6%21.6%—22.1%19.7%—20.7%Expected dividends— %— %— %Weighted average fair value at measurement date$21.54 $15.47 $8.88 |  |
Number of days threshold [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 20 |  |  |  |  |  |
Stock price increase threshold [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 125 |  |  |  |  |  |
Equity Incentive 2007 Plan |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Maximum vesting term for incentive and non-qualified stock options determined by board of directors |  |  | 10 years |  |  |  |
Share-based compensation arrangement by share-based payment award, award requisite service period |  |  | 5 years |  |  |  |
October 2013 Grants |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Nonqualified stock options to purchase shares, exercise price |  |  |  | $ 17.81 |  |  |
Term for not granting cash salary or bonus compensation in excess of $ 1.00 per year |  | 5 years |  |  |  |  |
Deferred compensation arrangement with individual - requisite service period |  | 5 years |  |  |  |  |
Percentage of total aggregate options vested on April 14, 2010 |  | 20.00% |  |  |  |  |
Vesting term of second group of options |  | 4 years |  |  |  |  |
Total compensation expense to be recognized per grant |  |  |  |  |  | $ 38.8 |
Recognized compensation expense |  |  |  |  | $ 0.0 | $ 4.3 | $ 7.2
Fair value of each option of grant |  | $ 5.72 |  |  |  |  |
Award Date [Domain] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Nonqualified stock options to purchase shares, exercise price | $ 85.04 |  |  |  |  |  |
Term for not granting cash salary or bonus compensation in excess of $ 1.00 per year | 5 years |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  | $ 25.5 |  |
Award Date [Domain] | Valuation Technique, Option Pricing Model [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Fair value of each option of grant | $ 25.47 |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum |  |  |  |  | 0.29% | 1.80% | 1.88%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  |  |  |  | 21.70% | 21.60% | 19.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  | 0.00% | 0.00% | 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |  |  |  |  | Black-Scholes Merton option-pricing model | Black-Scholes Merton option-pricing model | Black-Scholes Merton option-pricing model
Share-based Payment Arrangement, Option [Member] | Valuation Technique, Option Pricing Model [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
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% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |  |  |  |  | Monte Carlo simulation model |  |
Share-based Payment Arrangement, Option [Member] | Minimum |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  | 5 years 4 months 24 days | 5 years 3 months 18 days | 5 years 3 months 18 days
Share-based Payment Arrangement, Option [Member] | Minimum | Valuation Technique, Option Pricing Model [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  | 7 years 7 months 20 days |  |
Chief Executive Officer [Member] | October 2013 Grants |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Nonqualified stock options to purchase shares |  |  |  | 4,000,000 |  |  |
Chief Executive Officer [Member] | Award Date [Domain] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Nonqualified stock options to purchase shares |  |  |  |  | 1,000,000 |  |
Vincent W. Mitz | October 2013 Grants |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |
Nonqualified stock options to purchase shares |  |  |  | 3,000,000 |  |  |

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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 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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