EMPLOYEE BENEFIT AND RETIREMENT PLANS - Amendment to Postretirement Purchase Plans (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2021	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 15	$ 50
Interest cost	21	120
Amortization of prior service (credit)	(614)	(313)
Amortization of net (gain)	97	97
Total expense	$ (481)	$ (46)	$ (654)	$ 16,753	$ 930
Discount rate	2.57%		2.57%	2.73%