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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Dec. 31, 2021
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 December 31,Six Months Ended December 31,
(in thousands)2021202020212020
Service cost$281 $419 $567 $836 
Interest cost5,641 5,783 11,300 11,557 
Expected return on plan assets(12,999)(13,365)(26,035)(26,711)
Amortization of transition obligation24 23 48 45 
Amortization of prior service cost3 8 5 17 
Recognition of actuarial losses2,941 3,386 5,911 6,758 
Net periodic pension income$(4,109)$(3,746)$(8,204)$(7,498)
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 December 31,Six Months Ended December 31,
(in thousands)2021202020212020
Interest cost$72 $76 $144 $153 
Amortization of prior service credit(69)(69)(138)(138)
Recognition of actuarial loss74 77 148 154 
Net periodic other postretirement benefit cost$77 $84 $154 $169