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Business Segment Information (Details 3) - USD ($) $ in Thousands | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
--- | --- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets, net | $ 88,994 | $ 87,374 | $ 91,316
Total assets | 518,963 | 469,658 | 485,682
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets, net | 82,682 | 82,060 | 86,750
Total assets | 203,548 | 257,385 | 277,342
Foreign Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets, net | 6,312 | 5,314 | 4,566
Total assets | $ 315,415 | $ 212,273 | $ 208,340

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