EMPLOYEE BENEFIT AND RETIREMENT PLANS - Status of the Postretirement Medical and Life Insurance Benefit Plan (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
Change in benefit obligation
Service cost	$ 15	$ 50
Interest cost	$ 21	120
Weighted average assumptions - benefit obligation
Discount rate	2.57%		2.57%	2.73%
Components of net periodic benefit cost
Service cost	$ 15	50
Interest cost	21	120
Amortization of prior service (credit)	(614)	(313)
Amortization of net loss	(97)	(97)
Total expense	(481)	(46)	$ (654)	$ 16,753	$ 930
Other Postretirement Benefits Plan
Change in benefit obligation
Benefit obligation at beginning of year		$ 7,705	7,705	6,930	6,385
Service cost			65	73	72
Interest cost			141	240	265
Plan amendments			(5,585)	0	0
Benefits paid			(206)	(329)	(346)
Actuarial (gain) loss			(230)	791	554
Benefit obligation at end of year	$ 1,890		$ 1,890	$ 7,705	$ 6,930
Weighted average assumptions - benefit obligation
Discount rate	2.69%		2.69%	2.73%	3.56%
Rate of compensation increase				2.64%	2.64%
Change in plan assets
Employer contributions			$ 206	$ 329	$ 346
Benefits paid			(206)	(329)	(346)
Fair value of plan assets at end of year	$ 0		0	0	0
Amounts recognized in balance sheet
Current liability	(107)		(107)	(358)	(353)
Non-current liability	(1,783)		(1,783)	(7,347)	(6,577)
Net amount recognized in balance sheet	1,890		$ 1,890	$ 7,705	$ 6,930
Weighted average assumptions – net periodic benefit cost
Discount rate			2.73%	3.56%	4.27%
Rate of compensation increase				2.64%	2.64%
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Prior service credit	6,898		$ 6,898	$ 2,240	$ 2,777
Unrecognized (gain) loss	(1,736)		(1,736)	(2,160)	(1,452)
Amounts not yet recognized as a component of net periodic benefit cost	5,162		5,162	80	1,325
Accumulated net periodic benefit cost in excess of contributions	(7,052)		(7,052)	(7,785)	(8,255)
Net amount recognized	(1,890)		(1,890)	(7,705)	(6,930)
Components of net periodic benefit cost
Service cost			65	73	72
Interest cost			141	240	265
Amortization of prior service (credit)			(927)	(537)	(537)
Amortization of net loss			194	83	30
Total expense			(527)	(141)	(170)
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
Prior service credit	(1,474)		(1,474)	537	537
Net loss	189		189	(166)	(83)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total	$ (1,285)		$ (1,285)	$ 371	$ 454