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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