Summary of Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Revenues	$ 328,353	$ 373,831	$ 1,035,494	$ 1,057,022
Direct cost of revenues	247,565	300,797	796,516	843,116
Selling, general and administrative	62,772	55,148	183,948	161,591
Total costs and expenses	314,846	360,554	993,864	1,018,527
Loss from operations	13,328	13,872	40,921	40,045
Other expense	(5,068)	3,815	(24,234)	5,608
Net loss	5,106	36,398	11,017	58,018
Equity Method Investee [Member]
Defined Benefit Plan Disclosure [Line Items]
Revenues	2,689	718	5,760	718
Direct cost of revenues	4,402	804	7,307	804
Selling, general and administrative	1,265	1,525	3,928	1,525
Total costs and expenses	5,667	2,329	11,235	2,329
Loss from operations	(2,978)	(1,611)	(5,475)	(1,611)
Other expense	(82)		(83)
Net loss	$ (3,060)	$ (1,611)	$ (5,558)	$ (1,611)