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Business Segment Information (Details 1) - USD ($) $ in Thousands | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
--- | --- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets, net | $ 34,355 | $ 36,080 | $ 89,018
Total assets | 443,703 | 399,597 | 518,963
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets, net | 25,797 | 31,400 | 82,706
Total assets | 103,113 | 82,400 | 203,548
Foreign Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets, net | 8,558 | 4,680 | 6,312
Total assets | $ 340,590 | $ 317,197 | $ 315,415

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