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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, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]        
Net pension expense     $ 9,579 $ 5,806
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,789 $ 2,084 8,342 4,191
Interest cost 3,092 2,208 9,303 4,210
Expected return of plan assets (2,864) (1,946) (8,575) (2,780)
Amortization of actuarial (gains) losses 179 60 509 185
Net pension expense $ 3,196 $ 2,406 $ 9,579 $ 5,806