Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	$ 893,372	$ 810,132
Service revenues
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	726,840	667,818
Vehicle sales
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	166,532	142,314
Operating Segments | United States | United States
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	748,849	678,461
Operating Segments | United States | Service revenues | United States
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	651,657	590,758
Operating Segments | United States | Vehicle sales | United States
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	97,192	87,703
Operating Segments | International | International
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	144,523	131,671
Operating Segments | International | Service revenues | International
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	75,183	77,060
Operating Segments | International | Vehicle sales | International
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	$ 69,340	$ 54,611