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Summary of Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Summary of Investment Holdings [Line Items]    
Revenues $ 370,083 $ 343,425
Direct cost of revenues 291,625 273,174
Selling, general and administrative [1] 60,113 52,140
Depreciation, Depletion and Amortization, Nonproduction 4,446 4,493
Severance Costs 38 113
Total costs and expenses 356,222 329,920
Loss from operations 13,773 13,253
Other expense (16,216) (1,380)
Net loss (2,345) 8,415
Equity Method Investee [Member]    
Summary of Investment Holdings [Line Items]    
Revenues 1,691
Direct cost of revenues 1,462
Selling, general and administrative 1,889
Depreciation, Depletion and Amortization, Nonproduction
Severance Costs
Total costs and expenses 3,351
Loss from operations (1,660)
Other expense (1)
Net loss $ (1,661)
[1] Stock-based compensation included in selling, general and administrative expenses