Summary of Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Schedule of Equity Method Investments [Line Items]
Revenues	$ 337,058	$ 339,766	$ 707,141	$ 683,191
Direct cost of revenues	257,325	269,145	548,950	542,319
Selling, general and administrative	61,070	54,298	121,177	106,442
Total costs and expenses	322,802	328,050	679,019	657,972
Loss from operations	13,814	12,923	27,592	26,174
Other expense	(2,949)	3,170	(19,165)	1,792
Net loss	8,250	13,205	5,911	21,620
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	1,380		3,071
Direct cost of revenues	1,443		2,905
Selling, general and administrative	774		2,663
Total costs and expenses	2,217		5,568
Loss from operations	(837)		(2,497)
Other expense			(1)
Net loss	$ (837)		$ (2,498)