EMPLOYEE BENEFIT AND RETIREMENT PLANS - Status of the Postretirement Medical and Life Insurance Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Change in benefit obligation
Benefit obligation at beginning of year	$ 110,600
Benefits paid	(7,200)
Benefit obligation at end of year	109,500	$ 110,600
Change in plan assets
Employer contributions	2,400
Components of net periodic benefit cost
Net periodic benefit cost	9,900	1,400
Other Postretirement Benefits Plan
Change in benefit obligation
Benefit obligation at beginning of year	1,514	1,890
Service cost	22	36
Interest cost	70	49
Plan amendments	0	0
Benefits paid	(67)	(95)
Actuarial (gain) loss	(194)	(366)
Benefit obligation at end of year	$ 1,345	$ 1,514
Weighted average assumptions - benefit obligation
Discount rate	5.34%	4.77%
Change in plan assets
Employer contributions	$ 67	$ 95
Benefits paid, net of employee contributions	(67)	(95)
Fair value of plan assets at end of year	0	0
Amounts recognized in balance sheet
Current liability	(104)	(108)
Non-current liability	(1,241)	(1,406)
Net amount recognized in balance sheet	$ 1,345	$ 1,514
Weighted average assumptions – net periodic benefit cost
Discount rate	4.77%	2.69%
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Prior service credit	$ 3,950	$ 5,424
Accumulated gain (loss)	(810)	(1,181)
Amounts not yet recognized as a component of net periodic benefit cost	3,140	4,243
Net periodic benefit cost in excess of accumulated contributions	(4,485)	(5,757)
Net amount recognized	(1,345)	(1,514)
Components of net periodic benefit cost
Service cost	22	36
Interest cost	70	49
Amortization of prior service credit	(1,474)	(1,474)
Amortization of accumulated loss	177	189
Net periodic benefit cost	(1,205)	(1,200)
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
Prior service credit	(1,474)	(1,474)
Net loss	123	177
Total expected amortization, next fiscal year	$ (1,351)	$ (1,297)