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REVENUE Remaining performance obligations (Details)
$ in Millions
Oct. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 321
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-11-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Percentage 45.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-11-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Percentage 29.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-11-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Percentage 26.00%