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Pension Plans and Other Postretirement Benefit Plan - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Recognized actuarial loss (gain) $ (307) $ (218)  
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 243 245 $ 371
Interest cost 1,995 1,755 1,048
Expected return on plan assets (970) (853) (858)
Recognized actuarial loss (gain) 335 358 585
Settlement loss recognized 0 (12) 0
Net periodic benefit cost 1,603 1,493 1,146
Postretirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 18 20 27
Interest cost 89 68 31
Expected return on plan assets 0 0 0
Recognized actuarial loss (gain) (23) (69) (27)
Settlement loss recognized 0 0 0
Net periodic benefit cost $ 84 $ 19 $ 31