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Segments and Other Geographic Reporting Segment Reporting (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of Operating Segments | 2 |  |
Number of Reportable Segments | 2 |  |
Service revenues and vehicle sales: | $ 461,368 | $ 419,168 |
Yard operations | 207,694 | 217,607 |
Cost of vehicle sales | 57,756 | 38,297 |
General and administrative | 44,478 | 39,322 |
Operating income | 151,440 | 123,942 |
Interest (expense) income, net | (3,691) | (5,398) |
Other (expense) income, net | 1,037 | (4,416) |
Intercompany income (expense) | 0 | 0 |
Income before income taxes | 148,786 | 114,128 |
Income taxes | 34,703 | 36,568 |
Net income (Loss), Including Portion Attributable to Noncontrolling Interest | 114,083 | 77,560 |
Depreciation and amortization | 21,869 | 15,902 |
Capital expenditures, including acquisitions | 62,336 | 41,361 |
Total assets | 2,381,788 |  | $ 2,307,698
Goodwill | 335,120 |  | 337,235
Net Income (Loss) Attributable to Parent | 114,083 | 77,515 |
Operating Segments | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of vehicle sales | 25,943 | 18,760 |
Operating Segments | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of vehicle sales | 31,813 | 19,537 |
Operating Segments | United States | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 371,209 | 351,105 |
Yard operations | 177,642 | 192,833 |
General and administrative | 37,332 | 33,493 |
Operating income | 130,292 | 106,019 |
Interest (expense) income, net | (3,814) | (5,488) |
Other (expense) income, net | 625 | (4,111) |
Intercompany income (expense) | 1,411 | 2,304 |
Income before income taxes | 128,514 | 98,724 |
Income taxes | 30,466 | 33,585 |
Net income (Loss), Including Portion Attributable to Noncontrolling Interest | 98,048 | 65,139 |
Depreciation and amortization | 19,392 | 13,529 |
Capital expenditures, including acquisitions | 35,253 | 38,905 |
Total assets | 1,934,693 |  | 1,856,058
Goodwill | 256,434 |  | 256,434
Operating Segments | International | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 90,159 | 68,063 |
Yard operations | 30,052 | 24,774 |
General and administrative | 7,146 | 5,829 |
Operating income | 21,148 | 17,923 |
Interest (expense) income, net | 123 | 90 |
Other (expense) income, net | 412 | (305) |
Intercompany income (expense) | (1,411) | (2,304) |
Income before income taxes | 20,272 | 15,404 |
Income taxes | 4,237 | 2,983 |
Net income (Loss), Including Portion Attributable to Noncontrolling Interest | 16,035 | 12,421 |
Depreciation and amortization | 2,477 | 2,373 |
Capital expenditures, including acquisitions | 27,083 | 2,456 |
Total assets | 447,095 |  | 451,640
Goodwill | 78,686 |  | $ 80,801
Service revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 394,806 | 374,125 |
Service revenues | Operating Segments | United States | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 343,573 | 331,391 |
Service revenues | Operating Segments | International | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 51,233 | 42,734 |
Vehicle sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 66,562 | 45,043 |
Vehicle sales | Operating Segments | United States | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | 27,636 | 19,714 |
Vehicle sales | Operating Segments | International | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues and vehicle sales: | $ 38,926 | $ 25,329 |

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