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Summary of Statements of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Current assets $ 388,135 $ 322,132
Current liabilities (339,334) (324,870)
Revenues 1,446,990 1,345,769
Selling, general and administrative [1] 218,467 214,846
Total costs and expenses 1,390,731 1,322,764
Loss from operations and net loss 56,990 17,942
Nonoperating Income (Expense) 7,916 (1,267)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 96,891 $ 21,418
Equity Method Investee [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current assets 1,467  
Noncurrent assets 2,549  
Current liabilities (4,041)  
Noncurrent liabilities (50)  
Revenues 1,898  
Direct cost of revenues 1,937  
Selling, general and administrative 3,388  
Total costs and expenses 5,325  
Loss from operations and net loss (3,427)  
Nonoperating Income (Expense) 101  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (3,326)  
[1] Stock-based compensation included in selling, general and administrative expenses