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Summary of Significant Accounting Policies (Details Textuals)
$ in Thousands
12 Months Ended
Aug. 01, 2018
USD ($)
Jul. 31, 2019
USD ($)
Jul. 31, 2019
customer
Jul. 31, 2019
Jul. 31, 2019
Segment
Jul. 31, 2018
USD ($)
customer
Jul. 31, 2017
USD ($)
customer
Aug. 01, 2019
USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]                
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 23,000              
Cumulative Effect of New Accounting Standard in Period of Adoption               $ (22,954)
Share-based Payment Arrangement, Expense, Tax Benefit   $ 46,100       $ 21,300 $ 107,600  
Business Acquisition, Percentage of Voting Interests Acquired           59.50%    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners           40.50%    
Proceeds from sale of majority-owned subsidiary   0       $ 1,796 0  
Deconsolidation, Gain (Loss), Amount           900    
Advertising expenses   7,500       5,900 5,600  
Number of operating segments       2 2      
Number of reportable segment       2 2      
Capitalized Computer Software, Period Increase (Decrease)           15,500    
Capitalized Computer Software, Impairments             19,400  
Proceeds from the exercise of stock options   $ 34,398       $ 44,459 $ 31,188  
Minimum                
New Accounting Pronouncement, Early Adoption [Line Items]                
Cumulative Effect of New Accounting Standard in Period of Adoption               120,000
Maximum                
New Accounting Pronouncement, Early Adoption [Line Items]                
Cumulative Effect of New Accounting Standard in Period of Adoption               $ 135,000
Revenue Benchmark [Member]                
New Accounting Pronouncement, Early Adoption [Line Items]                
Number of Customers Exceeding Threshold | customer     0     0 0