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Pension Plans and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Cost (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]        
Recognized actuarial loss $ (233) $ (129) $ (432) $ (135)
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 17 30 51 90
Interest cost 1,469 927 4,407 2,781
Expected return on plan assets (1,090) (1,504) (3,273) (4,512)
Recognized actuarial loss 450 314 1,350 1,036
Net periodic cost (benefit) 846 (233) 2,535 (605)
Postretirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 8 18 24
Interest cost 24 11 72 33
Expected return on plan assets 0 0 0 0
Recognized actuarial loss 0 9 0 27
Net periodic cost (benefit) $ 30 $ 28 $ 90 $ 84