v3.26.1
Pension Plans and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]      
Recognized actuarial loss $ (968,000) $ (508,000) $ (495,000)
Net periodic benefit cost 968,000 508,000 495,000
Lump sum payments $ 0 $ 10,000 $ 103,000
Defined benefit plan, projected benefit obligation, discount rate 5.12% 5.07% 5.47%
Defined benefit plan, interest cost, discount rate, 3.43% 3.43% 4.13%
Defined benefit plan, settlement charges $ 0 $ 1,000 $ 7,000
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 57,000 55,000 71,000
Interest cost 6,032,000 6,425,000 6,673,000
Expected return on plan assets (6,066,000) (5,711,000) (5,167,000)
Recognized actuarial loss 1,699,000 1,720,000 1,786,000
Settlement loss recognized 0 1,000 7,000
Net periodic benefit cost 1,722,000 2,490,000 3,370,000
Defined benefit plan, settlement charges 1,628,000 1,336,000  
Postretirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 17,000 17,000 21,000
Interest cost 80,000 105,000 120,000
Expected return on plan assets 0 0 0
Recognized actuarial loss 7,000 18,000 23,000
Settlement loss recognized 0 0 0
Net periodic benefit cost 104,000 140,000 $ 164,000
Defined benefit plan, settlement charges $ 0 $ 0