v3.26.1
Pension Plans and Other Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]      
Amounts reclassified from accumulated other comprehensive loss $ 968 $ 508 $ 495
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Amounts reclassified from accumulated other comprehensive loss (1,699) (1,720) (1,786)
Postretirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Amounts reclassified from accumulated other comprehensive loss (7) (18) (23)
Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net unamortized gain (loss) arising during the period 92 (628) 263
Amounts reclassified from accumulated other comprehensive loss 1,699 1,720 1,786
Settlement loss recognized 0 1 7
Total recognized in other comprehensive income (loss) 1,791 1,093 2,056
Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax | Postretirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net unamortized gain (loss) arising during the period (500) 48 52
Amounts reclassified from accumulated other comprehensive loss 7 18 23
Settlement loss recognized 0 0 0
Total recognized in other comprehensive income (loss) $ (493) $ 66 $ 75