Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Assumptions (Details)

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EQUITY AND EARNINGS PER SHARE - Assumptions (Details) - USD ($)
$ in Thousands
1 Months Ended
Nov. 12, 2018
Apr. 10, 2018
Jan. 01, 2018
Nov. 30, 2019
Apr. 30, 2019
Nov. 30, 2018
Apr. 30, 2018
Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected Volatility (as percent)   35.66% 39.73% 44.73% 36.80%      
Expected Volatility, Minimum (as percent)           35.40%    
Expected Volatility, Maximum (as percent)           35.80%    
Expected Dividend Yield (as percent) 0.00% 0.00% 0.00% 0.00% 0.00%      
Expected Remaining Term       3 months 6 years      
Risk-Free Rate, Minimum (as percent)       1.57% 2.34% 3.09% 2.68% 2.16%
Risk-Free Rate, Maximum (as percent)           3.11% 2.82% 2.29%
Fair Value at Valuation Date $ 7,478 $ 3,558 $ 4,272 $ 67 $ 1,280      
Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected Remaining Term           6 years 2 years 8 months 12 days 3 years
Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected Remaining Term           6 years 6 months 6 years 3 months 18 days 6 years 7 months 6 days