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Business Segment Information (Details 3) - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets, net $ 36,068 $ 88,994 $ 87,374
Total assets 399,597 518,963 469,658
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets, net 31,388 82,682 82,060
Total assets 82,400 203,548 257,385
Foreign Countries [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets, net 4,680 6,312 5,314
Total assets $ 317,197 $ 315,415 $ 212,273