EMPLOYEE BENEFIT AND RETIREMENT PLANS - Narrative (Details)		3 Months Ended	12 Months Ended
	Dec. 31, 2013 USD ($)	Jun. 30, 2023 USD ($) plan	Jun. 30, 2023 USD ($) plan	Jun. 30, 2022 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2021 USD ($)
Statement [Line Items]
Defined contribution plan cost			$ 1,600,000	$ 1,600,000
Pension plan cost			8,700,000	200,000
Net periodic benefit cost			9,900,000	1,400,000
Defined benefit plan, benefit obligation		$ 109,500,000	109,500,000	$ 110,600,000
Decrease in plan assets			1,100,000
Actual return on plan assets			2,700,000
Employer contributions			2,400,000
Benefits paid, plan assets			$ 7,200,000
Defined Benefit Plan, Net Periodic Benefit Cost Credit, Interest Cost, Statement Of Income Or Comprehensive Income, Extensible List Not Disclosed Flag			0.9 million
Nonqualified Plan
Statement [Line Items]
Improvement in unfunded amount			$ 100,000
Maximum
Statement [Line Items]
Company's fixed contribution toward postretirement medical plan	$ 28.50
Maximum | Equities
Statement [Line Items]
Target allocations, as a percentage		70.00%	70.00%
Maximum | Company Stock
Statement [Line Items]
Target allocations, as a percentage		20.00%	20.00%
Maximum | Cash and Debt Securities
Statement [Line Items]
Target allocations, as a percentage		60.00%	60.00%
Minimum
Statement [Line Items]
Company's fixed contribution toward postretirement medical plan	$ 23.00
Minimum | Equities
Statement [Line Items]
Target allocations, as a percentage		40.00%	40.00%
Minimum | Company Stock
Statement [Line Items]
Target allocations, as a percentage		10.00%	10.00%
Minimum | Cash and Debt Securities
Statement [Line Items]
Target allocations, as a percentage		30.00%	30.00%
UNITED STATES
Statement [Line Items]
Net periodic benefit cost			$ 1,200,000
Interest cost			$ 1,800,000
UNITED STATES | Nonqualified Plan
Statement [Line Items]
Discount rate			5.34%	4.77%
UNITED KINGDOM
Statement [Line Items]
Net periodic benefit cost			$ 200,000
Discount rate			5.14%	3.82%
UNITED KINGDOM | Nonqualified Plan
Statement [Line Items]
Improvement in unfunded amount			$ 0.0
Pension Plan
Statement [Line Items]
Number of plans | plan		2	2
Net periodic benefit cost			$ (8,654,000)	$ (208,000)
Defined benefit plan, benefit obligation		$ 122,548,000	122,548,000	134,303,000		$ 172,617,000
Interest cost			5,820,000	4,113,000
Actual return on plan assets			2,701,000	(15,941,000)
Employer contributions			2,449,000	2,517,000
Benefits paid, plan assets			7,151,000	6,941,000
Fair value of common stock		5,100,000	5,100,000	3,800,000
Pension Plan | Forecast
Statement [Line Items]
Expected employer contributions for current fiscal year					$ 3,900,000
Pension Plan | Defined Benefit Plan, Underfunded Plan
Statement [Line Items]
Defined benefit plan, benefit obligation		13,000,000	13,000,000	23,700,000
Payment for pension benefits			11,500,000
Improvement in unfunded amount			10,700,000
Decrease in benefit liability obligation			11,800,000
Interest cost			6,900,000
Pension liability charge			7,200,000
Pension Plan | UNITED STATES
Statement [Line Items]
Net periodic benefit cost			(8,676,000)	(43,000)
Defined benefit plan, benefit obligation		$ 94,989,000	94,989,000	100,580,000		124,633,000
Payment for pension benefits			8,800,000
Improvement in unfunded amount			10,500,000
Interest cost			$ 4,571,000	$ 3,274,000
Discount rate			4.77%	2.69%
Actual return on plan assets			$ 8,641,000	$ (10,633,000)
Employer contributions			1,543,000	1,523,000
Benefits paid, plan assets			$ 5,577,000	$ 5,191,000
Discount rate		5.34%	5.34%	4.77%
Pension Plan | UNITED STATES | Forecast
Statement [Line Items]
Discount rate					3.56%
Expected employer contributions for current fiscal year					$ 3,000,000
Pension Plan | UNITED STATES | Market to Market
Statement [Line Items]
Fair value of plan assets		$ 1,700,000	$ 1,700,000
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Period Increase (Decrease)		10,500,000
Pension Plan | UNITED KINGDOM
Statement [Line Items]
Net periodic benefit cost			22,000	$ (165,000)
Defined benefit plan, benefit obligation		$ 27,559,000	27,559,000	33,723,000		$ 47,984,000
Interest cost			$ 1,249,000	$ 839,000
Discount rate			3.82%	1.86%
Actual return on plan assets			$ (5,940,000)	$ (5,308,000)
Employer contributions			906,000	994,000
Benefits paid, plan assets			$ 1,574,000	$ 1,750,000
Discount rate		5.14%	5.14%	3.82%
Pension Plan | UNITED KINGDOM | Forecast
Statement [Line Items]
Discount rate					5.74%
Expected employer contributions for current fiscal year					$ 900,000
Postemployment Retirement Benefits
Statement [Line Items]
Postretirement medical and life insurance benefit plan			$ 1,200,000	$ 1,200,000
Postemployment Retirement Benefits | Nonqualified Plan
Statement [Line Items]
Improvement in unfunded amount			$ 1,200,000
Postemployment Retirement Benefits | Maximum
Statement [Line Items]
Discount rate			5.34%
Postemployment Retirement Benefits | Minimum
Statement [Line Items]
Discount rate			4.77%