EMPLOYEE BENEFIT AND RETIREMENT PLANS - Portfolio by Valuation Category (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	100.00%	100.00%
Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	100.00%	100.00%
Fair Value, Inputs, Level 1 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 55,255	$ 54,112
Fair Value, Inputs, Level 2 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	79,937	64,315
Fair Value, Inputs, Level 3 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Total | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 135,192	$ 118,427
Cash Equivalents | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	2.00%	4.00%
Cash Equivalents | Fair Value, Inputs, Level 1 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 2,457	$ 5,165
Cash Equivalents | Fair Value, Inputs, Level 2 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Cash Equivalents | Fair Value, Inputs, Level 3 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Cash Equivalents | Total | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 2,457	$ 5,165
Fixed income
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	28.00%	27.00%
Fixed income | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	28.00%	27.00%
Fixed income | Fair Value, Inputs, Level 1 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 0	$ 0
Fixed income | Fair Value, Inputs, Level 2 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	38,155	32,740
Fixed income | Fair Value, Inputs, Level 3 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Fixed income | Total | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 38,155	$ 32,740
Equities
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	39.00%	40.00%
Equities | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	39.00%	40.00%
Equities | Fair Value, Inputs, Level 1 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 51,095	$ 48,947
Equities | Fair Value, Inputs, Level 2 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	1,887	888
Equities | Fair Value, Inputs, Level 3 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Equities | Total | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 52,982	$ 49,835
Mutual and pooled funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	31.00%	29.00%
Mutual and pooled funds | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Asset allocation percentage	31.00%	29.00%
Mutual and pooled funds | Fair Value, Inputs, Level 1 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 1,703	$ 0
Mutual and pooled funds | Fair Value, Inputs, Level 2 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	39,895	30,687
Mutual and pooled funds | Fair Value, Inputs, Level 3 | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Mutual and pooled funds | Total | Pension Plan
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 41,598	$ 30,687