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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Mar. 31, 2024
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net periodic pension (income)
The table below summarizes the components of net periodic pension income:
Three Months Ended March 31,Nine Months Ended March 31,
(in thousands)2024202320242023
Service cost$298 $243 $888 $718 
Interest cost8,901 8,085 26,665 24,127 
Expected return on plan assets(11,156)(10,045)(33,442)(30,054)
Amortization of transition obligation19 21 57 62 
Amortization of prior service (credit) cost(1)1 (4)4 
Recognition of actuarial losses1,442 1,117 4,315 3,314 
Net periodic pension income$(497)$(578)$(1,521)$(1,829)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net periodic pension (income)
The table below summarizes the components of net periodic other postretirement benefit cost:
Three Months Ended March 31,Nine Months Ended March 31,
(in thousands)2024202320242023
Interest cost$106 $104 $318 $312 
Amortization of prior service credit(63)(68)(190)(203)
Recognition of actuarial loss35 48 106 144 
Net periodic other postretirement benefit cost$78 $84 $234 $253