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Basis of Presentation (Tables)
3 Months Ended
Oct. 31, 2019
Accounting Policies [Abstract]  
Summary of disaggregated revenue
   Three months ended
October 31,
 
   2019   2018 
Cloud software and service revenue  $1,555   $1,474 
Product revenue   34    48 
Total operating revenues  $1,589   $1,522