Summary of Unaudited Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 373,831	$ 321,336	$ 1,057,022	$ 985,425
Selling, general and administrative	55,148	52,630	161,591	159,853
Total costs and expenses	360,554	317,310	1,018,527	978,301
Loss from operations and net loss	$ 13,872	$ 3,792	40,045	3,722
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Revenues			718
Direct cost of revenues			804
Selling, general and administrative			1,525
Total costs and expenses			2,329
Loss from operations and net loss			$ (1,611)