Segments and Other Geographic Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	$ 3,869,518	$ 3,500,921	$ 2,692,511
Yard operations	1,518,029	1,309,497	1,003,292
Cost of vehicle sales	614,498	585,203	346,128
General and administrative	250,422	231,224	206,665
Operating income	1,486,569	1,374,997	1,136,426
Depreciation and amortization, excluding debt costs	159,478	137,985	121,971
Capital expenditures, including acquisitions	516,636	444,052	467,996
Total assets	6,737,879	5,308,864
Goodwill	394,289	401,954	355,717
United States | United States | Operating Segments
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	3,189,648	2,945,150	2,272,072
Yard operations	1,292,527	1,123,986	849,037
Cost of vehicle sales	326,764	380,928	227,365
General and administrative	202,260	192,667	172,115
Operating income	1,368,097	1,247,569	1,023,555
Depreciation and amortization, excluding debt costs	135,804	120,635	107,765
Capital expenditures, including acquisitions	373,190	297,632	390,706
Total assets	5,825,064	4,615,788
Goodwill	270,269	270,269
International | International | Operating Segments
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	679,870	555,771	420,439
Yard operations	225,502	185,511	154,255
Cost of vehicle sales	287,734	204,275	118,763
General and administrative	48,162	38,557	34,550
Operating income	118,472	127,428	112,871
Depreciation and amortization, excluding debt costs	23,674	17,350	14,206
Capital expenditures, including acquisitions	143,446	146,420	77,290
Total assets	912,815	693,076
Goodwill	124,020	131,685
Service revenues
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	3,198,128	2,853,040	2,291,867
Service revenues | United States | United States
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	2,841,641	2,533,165	2,017,504
Service revenues | International | International
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	356,487	319,875	274,363
Vehicle sales
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	671,390	647,881	400,644
Vehicle sales | United States | United States
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	348,007	411,985	254,568
Vehicle sales | International | International
Segment Reporting Information [Line Items]
Service revenues and vehicle sales	$ 323,383	$ 235,896	$ 146,076