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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended
Oct. 31, 2017
USD ($)
segment
Oct. 31, 2016
USD ($)
Jul. 31, 2017
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of reportable segments | segment 1    
Total revenue $ 275,552 $ 188,561 [1]  
U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 187,365 106,168  
Long-lived assets 72,700   $ 63,300
Europe, the Middle East and Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 37,444 25,416  
Asia-Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 44,859 45,847  
Other Americas      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue $ 5,884 $ 11,130  
[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.