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REVENUE - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Sep. 30, 2019
Minimum  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Percentage of revenue recognized on remaining performance obligation 40.00%
Revenue over the remaining lives of the contracts 12 months
Maximum  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Percentage of revenue recognized on remaining performance obligation 84.00%
Revenue over the remaining lives of the contracts 36 months