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Segment Information, Revenues from External Customers and Long-Lived Assets by Geography Area (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
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 477,300 | $ 455,700 | $ 451,700 | $ 411,400 | $ 452,200 | $ 436,400 | $ 425,600 | $ 404,300 | $ 1,796,103 | $ 1,718,530 | $ 1,727,037
Long-lived assets | 289,934 |  |  |  | 243,058 |  |  |  | 289,934 | 243,058 | 207,464
Reportable Geographical Components [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 913,852 | 786,574 | 884,185
Long-lived assets | 249,542 |  |  |  | 208,572 |  |  |  | 249,542 | 208,572 | 166,878
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 147,406 | 189,479 | 153,442
Long-lived assets | 20,955 |  |  |  | 21,368 |  |  |  | 20,955 | 21,368 | 23,246
Reportable Geographical Components [Member] | Germany [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 98,404 | 75,090 | 69,676
Long-lived assets | 9,259 |  |  |  | 8,770 |  |  |  | 9,259 | 8,770 | 9,629
Reportable Geographical Components [Member] | Japan [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 81,572 | 62,674 | 76,930
Long-lived assets | 72 |  |  |  | 75 |  |  |  | 72 | 75 | 35
Reportable Geographical Components [Member] | Australia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 78,270 | 66,309 | 78,786
Long-lived assets | 1,454 |  |  |  | 591 |  |  |  | 1,454 | 591 | 1,041
Reportable Geographical Components [Member] | China [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 53,076 | 39,653 | 52,815
Long-lived assets | 229 |  |  |  | 270 |  |  |  | 229 | 270 | 244
Reportable Geographical Components [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 55,568 | 50,740 | 50,243
Long-lived assets | 3,635 |  |  |  | 1,232 |  |  |  | 3,635 | 1,232 | 1,617
Reportable Geographical Components [Member] | France [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 51,826 | 44,760 | 49,970
Long-lived assets | 635 |  |  |  | 335 |  |  |  | 635 | 335 | 2,211
Reportable Geographical Components [Member] | India [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 41,637 | 34,306 | 38,208
Long-lived assets | 1,437 |  |  |  | 245 |  |  |  | 1,437 | 245 | 234
Reportable Geographical Components [Member] | Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 274,492 | 368,945 | 272,782
Long-lived assets | $ 2,716 |  |  |  | $ 1,600 |  |  |  | $ 2,716 | $ 1,600 | $ 2,329

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