SUBSEQUENT EVENTS (Details) - USD ($)	May 11, 2020	May 08, 2020	Jul. 31, 2019	May 31, 2019	Jul. 31, 2018
Subsequent Event [Line Items]
Stock and debt repurchase authorized amount					$ 100,000,000
CONSOL Coal Resources LP
Subsequent Event [Line Items]
Stock and debt repurchase additional amount authorized			$ 25,000,000	$ 75,000,000
Stock and debt repurchase authorized amount			$ 200,000,000	$ 175,000,000
Subsequent Event | CONSOL Coal Resources LP
Subsequent Event [Line Items]
Stock and debt repurchase additional amount authorized		$ 70,000,000
Stock and debt repurchase authorized amount		$ 270,000,000
Stock and debt repurchase available capacity	$ 100,622,000