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Segments and Other Geographic Information Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2019
Apr. 30, 2019
 [1]
Jan. 31, 2019
 [1]
Oct. 31, 2018
 [1]
Jul. 31, 2018
Apr. 30, 2018
 [1]
Jan. 31, 2018
 [1]
Oct. 31, 2017
 [1]
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 $ 2,041,957 $ 1,805,695 $ 1,447,981
Direct Operating Costs                 888,111 846,868 678,401
Cost of vehicle sales                 255,504 196,461 137,552
General and Administrative Expense                 181,867 176,890 151,364
Impairment of long-lived assets                 0 1,131 19,365
Operating Income (Loss) $ 192,802 [1] $ 207,494 $ 164,739 $ 151,440 $ 134,837 [1] $ 174,619 $ 150,947 $ 123,942 716,475 584,345 461,299
Depreciation, Depletion and Amortization                 84,895 78,598 57,000
Payments to Acquire Productive Assets                 374,628 296,697 332,990
Assets 2,547,617       2,307,698       2,547,617 2,307,698 1,982,501
Goodwill 333,321       337,235       333,321 337,235 340,243
International [Member]                      
Segment Reporting Information [Line Items]                      
Impairment of long-lived assets                   1,157  
Operating Segments | UNITED STATES                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 1,656,569 1,491,022 1,193,188
Direct Operating Costs                 751,653 730,865 585,587
Cost of vehicle sales                 112,268 101,130 61,484
General and Administrative Expense                 151,854 144,140 130,392
Impairment of long-lived assets                   0 19,365
Operating Income (Loss)                 640,794 514,887 396,360
Depreciation, Depletion and Amortization                 75,135 67,779 47,507
Payments to Acquire Productive Assets                 311,472 255,868 317,646
Assets 2,094,592       1,856,058       2,094,592 1,856,058 1,514,018
Goodwill 256,998       256,434       256,998 256,434 259,162
Operating Segments | International [Member]                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 385,388 314,673 254,793
Direct Operating Costs                 136,458 116,003 92,814
Cost of vehicle sales                 143,236 95,331 76,068
General and Administrative Expense                 30,013 32,750 20,972
Impairment of long-lived assets                   1,131 0
Operating Income (Loss)                 75,681 69,458 64,939
Depreciation, Depletion and Amortization                 9,760 10,819 9,493
Payments to Acquire Productive Assets                 63,156 40,829 15,344
Assets 453,025       451,640       453,025 451,640 468,483
Goodwill $ 76,323       $ 80,801       76,323 80,801 81,081
Service revenues                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 1,755,694 1,578,502 1,286,252
Service revenues | Operating Segments | UNITED STATES | UNITED STATES                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 1,537,431 1,385,238 1,128,990
Service revenues | Operating Segments | International [Member] | International [Member]                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 218,263 193,264 157,262
Vehicle sales                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 286,263 227,193 161,729
Vehicle sales | Operating Segments | UNITED STATES | UNITED STATES                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 119,138 105,784 64,198
Vehicle sales | Operating Segments | International [Member] | International [Member]                      
Segment Reporting Information [Line Items]                      
Service revenues and vehicle sales                 $ 167,125 $ 121,409 $ 97,531
[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.