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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Eligible Age for Availing Postretirement Healthcare Benefits 65    
Special termination benefit charge   $ 431,000 $ 277,000
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (2,900,000) (2,600,000) (16,800,000)
Defined Contribution Plan, Cost 16,300,000 15,800,000 14,200,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Other Adjustments 4,335,000 (7,000)  
Pension plans contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement (668,000) (1,260,000)  
Accumulated Benefit Obligation for all Defined Benefit Pension Plans 674,200,000 695,300,000  
Net Periodic Pension Cost (2,025,000) (1,950,000) (15,990,000)
Special termination benefit charge 14,000    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 4,000 (18,000) (205,000)
Projected Benefit Payments for 2023 57,600,000    
Projected Benefit Payments for 2024 55,600,000    
Projected Benefit Payments for 2025 55,900,000    
Projected Benefit Payments for 2026 54,700,000    
Projected Benefit Payments for 2027 54,200,000    
Projected Benefit Payments for 2028 through 2032 254,300,000    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost related to Net Actuarial Losses 8,400,000    
Estimated Future Employer Contributions 10,000,000.0    
Service Cost 1,181,000 963,000 1,117,000
Other postretirement benefit plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Pension Cost 312,000 $ 338,000 $ 309,000
Projected Benefit Payments for 2023 1,000,000.0    
Projected Benefit Payments for 2024 1,000,000.0    
Projected Benefit Payments for 2025 900,000    
Projected Benefit Payments for 2026 800,000    
Projected Benefit Payments for 2027 700,000    
Projected Benefit Payments for 2028 through 2032 2,900,000    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost related to Net Actuarial Losses 100,000    
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost related to Prior Service Credit (300,000)    
Estimated Future Employer Contributions $ 1,000,000