EMPLOYEE BENEFIT PLANS - Pension Plan - other (Details)		1 Months Ended	9 Months Ended
	Jan. 01, 2010	Dec. 31, 2009	Mar. 31, 2020
Employee Benefit Plans
Threshold age of employee who are eligible for pension plan			21 years
Threshold period of service of employee to be eligible for pension plan			1 year
Pension plan
Employee Benefit Plans
Pensions paid as annuity using pension formula	1.50%	2.00%
Average of highest consecutive years of total compensation over the last ten years multiplied by credited service up to thirty years to calculate pension formula		5 years
Total compensation year used for average of the five highest consecutive years multiplied by credited service up to thirty years to calculate pension formula		10 years
Maximum credited service (in years)		30 years