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Segment Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 2,392,849 | $ 488,426 | $ 140,854 | $ 137,802 | $ 2,327,915 | $ 451,882 | $ 131,332 | $ 125,185 | $ 3,159,931 | $ 3,036,314 | $ 3,038,153
Document Fiscal Year Focus |  |  |  |  |  |  |  |  | 2018 |  |
Foreign |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 24,500 |  |  |  | $ 21,000 |  |  |  | $ 24,500 | $ 21,000 | $ 17,500

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