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REVENUE Remaining performance obligations (Details)
$ in Millions
Oct. 31, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation, Amount $ 347
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, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Percentage 50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2021
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, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation, Percentage 30.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-11-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Revenue, Remaining Performance Obligation, Percentage 20.00%