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Long-Term Debt (Details Textuals) - USD ($)
$ in Thousands
 4 Months Ended 12 Months Ended
Jul. 31, 2020
Jul. 21, 2020
Jul. 21, 2016
Mar. 15, 2016
Jul. 20, 2016
Jul. 31, 2021
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Dec. 03, 2014
Line of Credit Facility [Line Items]                    
Total Consolidated Net Leverage Ratio             (45.00%)      
Minimum Liquidity           $ 2,100,000 $ 2,100,000      
Applicable interest rate added to reference rate in order to compute variable interest rate             1.50%      
Debt instrument costs             $ 0 $ 2,814 $ 0  
Scenario 1 [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms 1             325.00%      
Note Agreement, Covenant Terms             325.00%      
Scenario 2 [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms 1             350.00%      
Note Agreement, Covenant Terms             350.00%      
Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Debt instrument costs   $ 2,800                
Credit Agreement | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Maturity date         Dec. 03, 2019          
Note Purchase Agreement | Senior Notes                    
Line of Credit Facility [Line Items]                    
Senior notes                   $ 400,000
4.07% Senior Notes, Series A | Senior Notes                    
Line of Credit Facility [Line Items]                    
Senior notes                   $ 100,000
Stated interest rate                   4.07%
4.19% Senior Notes, Series B | Senior Notes                    
Line of Credit Facility [Line Items]                    
Senior notes                   $ 100,000
Stated interest rate                   4.19%
4.25% Senior Notes, Series C | Senior Notes                    
Line of Credit Facility [Line Items]                    
Senior notes                   $ 100,000
Stated interest rate                   4.25%
4.35% Senior Notes, Series D | Senior Notes                    
Line of Credit Facility [Line Items]                    
Senior notes                   $ 100,000
Stated interest rate                   4.35%
Federal Funds Rate                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate             0.50%      
Eurodollar [Member]                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate             1.00%      
Eurodollar [Member] | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate 0.75%         0.75%        
Wells Fargo and Bank of America                    
Line of Credit Facility [Line Items]                    
Maturity date         Mar. 15, 2021          
Wells Fargo and Bank of America | Revolving Credit Facility | Line of Credit                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity                   $ 300,000
Wells Fargo and Bank of America | Term Loan Facility | Line of Credit                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity                   $ 300,000
Wells Fargo and Bank of America | First Amendment To Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity       $ 350,000            
Line of Credit Facility, Increase (Decrease), Net       50,000            
Wells Fargo and Bank of America | First Amendment To Credit Agreement | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity       $ 93,800            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. [Member] | Revolving Credit Facility | Line of Credit                    
Line of Credit Facility [Line Items]                    
Outstanding borrowings           $ 0 $ 0      
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. [Member] | Scenario 3 [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms             not to exceed $50.0 million      
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. [Member] | Scenario 4 [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms             not less than $75.0 million      
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. [Member] | Second Amendment To Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity     $ 850,000              
Line of Credit Facility, Increase (Decrease), Net     $ 500,000              
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member]                    
Line of Credit Facility [Line Items]                    
Maturity date             Jul. 21, 2023      
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Commitment fee rate range           0.25%        
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Commitment fee rate range           0.35%        
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | First Amended and Restated Credit Agreement [Member] | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity           $ 1,050,000 $ 1,050,000      
Line of Credit Facility, Increase (Decrease), Net           $ 200,000        
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | Eurodollar [Member] | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate           1.50%        
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | Eurodollar [Member] | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate           2.25%        
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | Base Rate [Member] | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate           0.50%        
WellsFargo,NationalAssociation,TruistBank,BMOHarrisBankN.A.,SantanderBankN.A.,andBankofAmerica,N.A. [Member] | Base Rate [Member] | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate           1.25%