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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Jul. 31, 2018
USD ($)
segment
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Number of reportable segments | segment                 1    
Total revenue $ 303,748 $ 289,413 $ 286,744 $ 275,552 $ 252,458 $ 205,670 $ 199,214 $ 188,561 $ 1,155,457 $ 845,903 $ 503,410
U.S.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 648,805 488,079 319,296
Long-lived assets $ 130,000       $ 63,300       130,000 63,300  
Europe, the Middle East and Africa                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 224,392 138,815 65,599
Asia-Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 240,247 186,864 96,723
Other Americas                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 42,013 $ 32,145 $ 21,792