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FAIR VALUE MEASUREMENTS - Assumptions used in Monte Carlo simulation (Details)
Apr. 30, 2019
item
Estimated volatility rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair value of the contingent consideration 40
Risk-free rate of return  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair value of the contingent consideration 3.2
Simulation steps  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair value of the contingent consideration 10,000