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Segments and Other Geographic Information (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Apr. 30, 2018 | [1] | Jan. 31, 2018 | [1] | Oct. 31, 2017 | [1] | Jul. 31, 2017 | Apr. 30, 2017 | [1] | Jan. 31, 2017 | [1] | Oct. 31, 2016 | [1] | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total service revenues and vehicle sales | $ 449,223 | [1] | $ 478,198 | $ 459,106 | $ 419,168 | $ 378,596 | [1] | $ 373,862 | $ 349,532 | $ 345,991 | $ 1,805,695 | $ 1,447,981 | $ 1,268,449
Yard operations |  |  |  |  |  |  |  |  |  |  | 846,868 | 678,401 | 582,904
Cost of vehicle sales |  |  |  |  |  |  |  |  |  |  | 196,461 | 137,552 | 140,959
General and administrative |  |  |  |  |  |  |  |  |  |  | 176,890 | 151,364 | 138,116
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  | 1,131 | 19,365 | 0
Operating income | 134,837 | [1] | 174,619 | 150,947 | 123,942 | 110,807 | [1] | 136,788 | 108,880 | 104,824 | 584,345 | 461,299 | 406,470
Interest (expense) income, net |  |  |  |  |  |  |  |  |  |  | (19,075) | (22,373) | (22,157)
Other income, net |  |  |  |  |  |  |  |  |  |  | (2,759) | 1,174 | 11,552
Intercompany income (expense) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income tax expense | 132,729 | [1] | 171,216 | 144,438 | 114,128 | 106,379 | [1] | 131,088 | 100,099 | 102,534 | 562,511 | 440,100 | 395,865
Income tax expense |  |  |  |  |  |  |  |  |  |  | 144,504 | 45,839 | 125,505
Net income | 109,748 | [1] | $ 127,348 | $ 103,256 | $ 77,515 | 70,335 | [1] | $ 90,546 | $ 66,066 | $ 167,280 | 417,867 | 394,227 | 270,360
Net Income |  |  |  |  |  |  |  |  |  |  | 418,007 | 394,261 | 270,360
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 78,598 | 57,000 | 48,575
Capital expenditures, including acquisitions |  |  |  |  |  |  |  |  |  |  | 296,697 | 332,990 | 173,917
Total assets | 2,307,698 |  |  |  |  | 1,982,501 |  |  |  |  | 2,307,698 | 1,982,501 | 1,649,820
Goodwill | 337,235 |  |  |  |  | 340,243 |  |  |  |  | 337,235 | 340,243 | 260,198
International |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  | 1,157 |  |
Operating segments | United States |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total service revenues and vehicle sales |  |  |  |  |  |  |  |  |  |  | 1,491,022 | 1,193,188 | 1,016,036
Yard operations |  |  |  |  |  |  |  |  |  |  | 730,865 | 585,587 | 494,146
Cost of vehicle sales |  |  |  |  |  |  |  |  |  |  | 101,130 | 61,484 | 55,866
General and administrative |  |  |  |  |  |  |  |  |  |  | 144,140 | 130,392 | 118,315
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  | 0 | 19,365 |
Operating income |  |  |  |  |  |  |  |  |  |  | 514,887 | 396,360 | 347,709
Interest (expense) income, net |  |  |  |  |  |  |  |  |  |  | (19,996) | (23,373) | (23,178)
Other income, net |  |  |  |  |  |  |  |  |  |  | (3,285) | (10) | 1,216
Intercompany income (expense) |  |  |  |  |  |  |  |  |  |  | 10,355 | 12,549 | 13,266
Income before income tax expense |  |  |  |  |  |  |  |  |  |  | 501,961 | 385,526 | 339,013
Income tax expense |  |  |  |  |  |  |  |  |  |  | 136,136 | 34,985 | 115,667
Net income |  |  |  |  |  |  |  |  |  |  | 365,825 | 350,541 | 223,346
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 67,779 | 47,507 | 39,083
Capital expenditures, including acquisitions |  |  |  |  |  |  |  |  |  |  | 255,868 | 317,646 | 153,451
Total assets | 1,856,058 |  |  |  |  | 1,514,018 |  |  |  |  | 1,856,058 | 1,514,018 | 1,249,755
Goodwill | 256,434 |  |  |  |  | 259,162 |  |  |  |  | 256,434 | 259,162 | 179,906
Operating segments | International |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total service revenues and vehicle sales |  |  |  |  |  |  |  |  |  |  | 314,673 | 254,793 | 252,413
Yard operations |  |  |  |  |  |  |  |  |  |  | 116,003 | 92,814 | 88,758
Cost of vehicle sales |  |  |  |  |  |  |  |  |  |  | 95,331 | 76,068 | 85,093
General and administrative |  |  |  |  |  |  |  |  |  |  | 32,750 | 20,972 | 19,801
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  | 1,131 | 0 |
Operating income |  |  |  |  |  |  |  |  |  |  | 69,458 | 64,939 | 58,761
Interest (expense) income, net |  |  |  |  |  |  |  |  |  |  | 921 | 1,000 | 1,021
Other income, net |  |  |  |  |  |  |  |  |  |  | 526 | 1,184 | 10,336
Intercompany income (expense) |  |  |  |  |  |  |  |  |  |  | (10,355) | (12,549) | (13,266)
Income before income tax expense |  |  |  |  |  |  |  |  |  |  | 60,550 | 54,574 | 56,852
Income tax expense |  |  |  |  |  |  |  |  |  |  | 8,368 | 10,854 | 9,838
Net income |  |  |  |  |  |  |  |  |  |  | 52,182 | 43,720 | 47,014
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 10,819 | 9,493 | 9,492
Capital expenditures, including acquisitions |  |  |  |  |  |  |  |  |  |  | 40,829 | 15,344 | 20,466
Total assets | 451,640 |  |  |  |  | 468,483 |  |  |  |  | 451,640 | 468,483 | 400,065
Goodwill | $ 80,801 |  |  |  |  | $ 81,081 |  |  |  |  | $ 80,801 | $ 81,081 | $ 80,292
[1] | Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |