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Business Segment Information (Details 2) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets, net $ 91,316 $ 81,760 $ 80,742
Total assets 485,682 480,931 435,407
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets, net 89,340 79,281 77,580
Total assets 281,625 284,249 294,337
Foreign Countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets, net 1,976 2,479 3,162
Total assets $ 204,057 $ 196,682 $ 141,070