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Segment Information, Revenues from External Customers and Long-Lived Assets by Geography Area (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | $ 1,718,530 | $ 1,727,037 | $ 1,822,440
Long-lived assets | 252,488 | 214,770 | 193,010
Pretax income for consolidated operations outside the United States | 192,910 | 159,152 | 165,085
Reportable Geographical Components [Member] | United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 786,574 | 884,185 | 920,166
Long-lived assets | 208,572 | 166,878 | 143,786
Reportable Geographical Components [Member] | United States [Member] | Export Sales [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 148,700 | 164,400 | 168,000
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 189,479 | 153,442 | 142,680
Long-lived assets | 21,368 | 23,246 | 24,711
Reportable Geographical Components [Member] | Germany [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 75,090 | 69,676 | 83,714
Long-lived assets | 8,770 | 9,629 | 9,781
Reportable Geographical Components [Member] | Japan [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 62,674 | 76,930 | 84,420
Long-lived assets | 75 | 35 | 21
Reportable Geographical Components [Member] | China [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 39,653 | 52,815 | 45,159
Long-lived assets | 270 | 244 | 307
Reportable Geographical Components [Member] | India [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 34,306 | 38,208 | 39,494
Long-lived assets | 245 | 234 | 180
Reportable Geographical Components [Member] | Australia [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 66,309 | 78,786 | 80,380
Long-lived assets | 591 | 1,041 | 1,696
Reportable Geographical Components [Member] | France [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 44,760 | 49,970 | 57,492
Long-lived assets | 9,765 | 9,517 | 6,720
Reportable Geographical Components [Member] | Canada [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 50,740 | 50,243 | 56,949
Long-lived assets | 1,232 | 1,617 | 1,606
Reportable Geographical Components [Member] | Other Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 368,945 | 272,782 | 311,986
Long-lived assets | $ 1,600 | $ 2,329 | $ 4,202

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