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Customer and Geographic Information (Tables)
 12 Months Ended
Jul. 31, 2018
Geographic Areas, Revenues from External Customers [Abstract]  
Schedule of net sales as a percentage, by geography and customer type
Sales by geography and customer type, as a percentage of consolidated net sales, are as follows:
 
 
Fiscal Years Ended July 31,
 
 
2018
 
2017
 
2016
United States
 
 
 
 
 
 
U.S. government
 
35.5
%
 
32.7
%
 
40.8
%
Domestic
 
38.9
%
 
38.9
%
 
29.2
%
Total United States
 
74.4
%
 
71.6
%
 
70.0
%
 
 
 
 
 
 
 
International
 
25.6
%
 
28.4
%
 
30.0
%
Total
 
100.0
%
 
100.0
%
 
100.0
%