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PENSION PLANS AND OTHER POST-RETIREMENT BENEFITS - Components of Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net pension expense     $ 10,194 $ 9,579
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,758 $ 2,789 8,300 8,342
Interest cost 3,242 3,092 9,727 9,303
Expected return of plan assets (2,936) (2,864) (8,807) (8,575)
Amortization of actuarial (gains) losses 317 179 974 509
Net pension expense $ 3,381 $ 3,196 $ 10,194 $ 9,579