REVENUES FROM CONTRACT WITH CUSTOMERS - Remaining Unsatisfied Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-05-01 $ in Millions	Apr. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract backlog amount	$ 761.8
Contract backlog (as percent)	36.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months